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Sometimes I come across an app thats not on the Android market and you have to install it manually. Has anyone come across a virus/trojan on Android yet? Im curious how easy or hard it is to modify a legit applications and put a virus/trojan in it?
Lol have not seen one yet. Android isn't that big yet so doubt hackers would really spend time putting trojans to get stuff like your email password lol.
Take everything you know about microshaft windoze and forget it. The system architecture of android is almost completely invulnerable to viruses/worms/etc.
In a typical unix system, hacks can take one of very few possible approaches;
1) service bug targeting, i.e., if one were to discover a security vulnerability in the Apache HTTP server, one could theoretically compromise it. That particular service I mean.
2) user account targeting, i.e., one could convince a user to run something dangerous, which would infect that specific user's account, of course, this attack would limit itself to damaging that user's personal data and would not be able to take down the whole system unless it also targeted a kernel or X-server exploit.
Note specifically regarding #1, that in a well configured system, that targeting a particular service would be restricted to a specific user account just as in #2 since each service runs as its own username.
3) Targeting KERNEL defects; this is perhaps the most frightening possibility. It is also the least likely since it would also require #1 or #2. Any particular kernel attack, particularly in Linux is also very unlikely to work for long due to the open sourced nature of Linux. There are a LOT more people involved in monitoring the fundamental securities of the Linux kernel than any other OS because of its open nature. It is also a source of PRIDE for kernel HACKERS that they ALSO be responsible for openly providing the SOLUTION to any exploits that they discover. And they usually do this with their REAL NAME since it basically immortalizes them. The end result is that every time a kernel exploit is discovered, it tends to be patched within hours of its first application.
Now of course you want to know how this affects Android, since by all appearances, there is no user-level security. WRONG. The Android security level is actually on par with service level security on unix servers. EVERY SINGLE application installed is granted is own user account, which means that if any particular application is dangerous, its range of damage is restricted to that particular application's private data, as well as any permissions that the application is explicitly granted (i.e. when you install an application, it gives you the required security list). There is also the very slim possibility of a kernel exploit (though this is extremely unlikely), and it could damage the data on the sdcard (since it is an MS-crap filesystem with no security restrictions).
Of course you will note that older versions of the ADP1 system image came with an unregulated 'su' command (which you could also end up with using a "cat sh > su; chmod 4755 su" root approach) which basically can be used by any application to take over the whole system. Make sure that you don't have any such su command on your droid. Either use a password-protected su command (which will cause problems for trusted apps requesting root privileges), or the gui-supported su command. Subsequent ADP1 images came with an su command that was restricted to the debugging terminal user, which is fine.
In other words... you don't have much to worry about. Just don't do anything really stupid, like installing an untrusted application that wants a boat load of privileges that it shouldn't be asking for.
lbcoder said:
EVERY SINGLE application installed is granted is own user account, which means that if any particular application is dangerous, its range of damage is restricted to that particular application's private data, as well as any permissions that the application is explicitly granted (i.e. when you install an application, it gives you the required security list).
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Might be worth pointing out that android apps are for the most part interpreted language apps, meaning the onus of security and stability (just from an apk standpoint) falls largely on the vm. All the lower level subsystems are pretty well protected by the Linux kernel, and these have been significantly tried in fire by decades of Linux server deployment.
lbcoder said:
The system architecture of android is almost completely invulnerable to viruses/worms/etc.
Click to expand...
Click to collapse
jashsu said:
Might be worth pointing out that android apps are for the most part interpreted language apps, meaning the onus of security and stability (just from an apk standpoint) falls largely on the vm. All the lower level subsystems are pretty well protected by the Linux kernel, and these have been significantly tried in fire by decades of Linux server deployment.
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All the points about the protection offered from the Linux kernel and the VM are valid. Computer secuity is an ongoing battle between the software originators and the hackers trying to get in. I'm not saying it's remotely likely, particularly due to the market share, but rule one in my book is don't taunt the hackers.
lbcoder said:
Take everything you know about microshaft windoze and forget it. The system architecture of android is almost completely invulnerable to viruses/worms/etc.
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Click to collapse
Until the Android Dev team screw up again and lets any app run in the system process when requested (which was why cupcake was delayed in the US).
thanks for the post.
I was curious if someone could unpack a .apk file and modify a application easily, say have it send personal info to xyz server instead of the server the app was designed for or send it to both servers so the user doesnt think anything is wrong.
Are the files in the .apk editable, like an .exe is compiled for windows and the .exe cannot be edited (since its machine code).
androidmonkey said:
thanks for the post.
I was curious if someone could unpack a .apk file and modify a application easily, say have it send personal info to xyz server instead of the server the app was designed for or send it to both servers so the user doesnt think anything is wrong.
Are the files in the .apk editable, like an .exe is compiled for windows and the .exe cannot be edited (since its machine code).
Click to expand...
Click to collapse
Yes, apks are basically just zip files with cryptographic signatures. If you get your apks from Market then there is little to no risk of apks being tampered with. If you install your apks from any source other than Market, then you just have to trust the source that the apk hasn't been modified. Obviously if the apk itself doesn't ask for many permissions then it shouldn't be a problem. For example if you download a game apk from a developer's personal webpage and it asks for just permission to keep the screen alive, there's little risk to your data. However if you download an app that has read/write access to your contacts, or has root access, then you better be sure that the site you get it from is trustworthy.
jashsu said:
Yes, apks are basically just zip files with cryptographic signatures. If you get your apks from Market then there is little to no risk of apks being tampered with. If you install your apks from any source other than Market, then you just have to trust the source that the apk hasn't been modified. Obviously if the apk itself doesn't ask for many permissions then it shouldn't be a problem. For example if you download a game apk from a developer's personal webpage and it asks for just permission to keep the screen alive, there's little risk to your data. However if you download an app that has read/write access to your contacts, or has root access, then you better be sure that the site you get it from is trustworthy.
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So the files in the .apk not executables, rather interpreted with the VM? Im curious if those files can be read and changed. For instance, can someone open the file in a Java SDK and change the code? Or are those files protected so they cant be modified? For instance, could you download soundboard app from the Market, "unzip" the .apk, and put your own sounds in it?
androidmonkey said:
So the files in the .apk not executables, rather interpreted with the VM? Im curious if those files can be read and changed. For instance, can someone open the file in a Java SDK and change the code? Or are those files protected so they cant be modified? For instance, could you download soundboard app from the Market, "unzip" the .apk, and put your own sounds in it?
Click to expand...
Click to collapse
Unless the classes are specifically performing security/sanity checks, there's nothing keeping you from replacing asset files (pngs, wavs, etc) and then resigning the apk with any key of your choosing. However, altering xmls and classes is more difficult as they are obfuscated/optimized by default.
For apps distributed officially through the Android market, the only way Google can provide assurance for the app producer against tampering is app-protected folder. Of course that assumes that root access is not provided, which is most likely a prerequsite for any phone to be branded "with Google" and have Market access. From the viewpoint of the consumer, apps are guaranteed by Google against tampering only if retrieved through Market. Once the app is on the device, it is protected via Android's use of Linux user access permission model (each app is its own user). The consumer may of course alter the file him/herself, unless it is a protected app, in which case root is required.
sounds buggy. i hope not. this reminds me of when Mozilla firefox became popular i slowly starte dto see code become available to make pop ups n my belloved browser
Virus found on Android phone...
Article 1:
NEWS
An employee at Spanish antivirus firm Panda Security received a new Android-based Vodafone HTC Magic with malware on it, according to researchers at Panda Labs.
"Today one of our colleagues received a brand new Vodafone HTC Magic with Google's Android OS," researcher Pedro Bustamante wrote on the Panda Research Blog on Monday.
"The interesting thing is that when she plugged the phone to her PC via USB, her Panda Cloud Antivirus went off, detecting both an autorun.inf and autorun.exe as malicious," he wrote. "A quick look into the phone quickly revealed it was infected and spreading the infection to any and all PCs that the phone would be plugged into."
Article 2:
Mariposa virus back on Vodafone Android smartphones
HTC Magic According to a Spanish blogger, around 3,000 memory cards supplied by Vodafone Spain were infected with the Mariposa bot client. The mobile network operator has now reportedly confirmed that these included HTC Magic Android-based smartphone models, as well as other devices. A spokesperson for the company has told CNET that it is a "local incident". Vodafone says it has identified customers that could potentially be affected and it will be sending them new memory cards. It has also offered to supply them with tools to restore the integrity of their devices.
Reports of an HTC Magic smartphone carrying the virus were first published less than two weeks ago, however the malware is not able to harm the Android smartphone itself. The bot only attempts to contact a command & control server when connected to a Windows PC. The virus should be detected by most up-to-date anti-virus solutions.
Personal take:
Interesting to note that the virus being carried on an Android phone and was used to infect PC's NOT other Android phones. It came straight from manufacturing with the virus on, so as of yet I still haven't heard of a virus that can infect an android phone.
Further more, I have seen Anti-virus software on the market place AND being offered by Norton. What do they protect against if there are no known virus threats? Do they just draw a nice pretty anti-virus logo on the screen to make you feel comfy? hehehe.
Trojans in the hacked up ROMs people are distributing
androidmonkey said:
Sometimes I come across an app thats not on the Android market and you have to install it manually. Has anyone come across a virus/trojan on Android yet? Im curious how easy or hard it is to modify a legit applications and put a virus/trojan in it?
Click to expand...
Click to collapse
I've found a trojan in at least one of the ROMs being distributed on here. Even reported directly from the developer's own file sharing site.
"Stock" ROM http://forum.xda-developers.com/showthread.php?t=2066023
Attached is a photo of the file scanned from the linked file sharing site for the KERNEL he wants you to INSTALL!!
Click the link to JB_KERNEL_3.17.841.2_EVITA_Init.d_Support_Installer.zip - 8.54 MB in that thread and see for yourself.
Be careful what you install on your device. ANDR.Trojan.GingerBreak takes full administrative control of your device and downloads more trojans to siphon out your private personal data.
While I wait for my micro sd to get here to root and use my Aria, I have been just playing around with it and checking out various apps in the market. Then I saw an antivirus app and downloaded. Since I am new to Android, I thought I would ask others whether they have had any problems (or if there are problems) that require an antivirus. Or is it just a useless app?
I noticed there are apps that can contain some important information (i.e. mobile banking and e-mails), but is an antivirus really needed?
Thanks in advance for the discussion.
I personally do not use one, and don't plan on using one unless someone supplies a greatly convincing argument. While I don't doubt that it is a possibility in the future it will be needed, I don't believe they are necessary up to this point. From what I've read there are very few viruses/malware whatnot out there written to affect Android. Everytime you install an app it tells you exactly what it needs to access on that second screen. Also, I'm not sure if you have any experience with what a lot of antivirus applications tend to do to computers speed, but I imagine it'd affect the phone in a similar fashion.
You can read a better constructed forum post about it here
If I'm incorrect on anything someone please correct me
Thanks. That was a good read.
I was just unsure if I want to use the online banking app. It is very helpful and useful but I was just a bit hesitant.
No problem In my opinion, I think for something like that (I use Mint personally, if you don't know what it is, you should check it out for banking/credit cards, finance in general) losing the phone and having the information get into the wrong hands is a bigger concern than a virus stealing it. Again, that's my opinion. Although there are apps for the scenario I described also SMobile Anti-Theft is the only one I can think of off the top of my head for no particular reason, but I know there are a few others (possibly better, not using one myself just yet) out there
Mobile Antivirus = Rip off and waste of phone resources. Sad part is, many programs meant to facilitate tracking your own phone (lost/stolen) for some reason include antivirus kind of crap in it. There are alternatives, but none the less it's all complete nonsense.
Works great, never had a virus with it! Or without it.
I dont have one on my android right now It's true I have to download antivirus software now for Cellphones, especialy android phones. Some of them like avast already have this option. I've read ZenOK Free Antivirus is going to release a free version too. which one you recommend
Never used antivirus on my android phone or my Ubuntu laptop. Never had any problems. I think worst case scenario right now is receiving a virus via email and forwarding it on to an unsuspecting windows box. But then again anyone who gets that email on windows And doesn't have antivirus is foolish.
Of course this could all change in the future and it may one day be necessary yo use an antivirus on android.
Sent from my cm7 Aria.
With your phone it may not be really needed but your laptop?! Do you know how many viruses, malicious software, adware and spyware could be on your laptop right now? I would suggest at least using it on your laptop. Anyways, I do personally use one on my phone as well.
theonew said:
With your phone it may not be really needed but your laptop?! Do you know how many viruses, malicious software, adware and spyware could be on your laptop right now? I would suggest at least using it on your laptop. Anyways, I do personally use one on my phone as well.
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Are you familiar with Linux based systems such as Ubuntu? It works the same way as android, which is also Linux based. It doesn't operate anything like a windows system. Everything runs in its own little 'box' (think .apks) and pretty much all software is downloaded through an Ubuntu download center (think Android Market). Everything has to have permissions, also just like android. It doesn't utilize .exe like windows. All this adds up to a system that is pretty secure. I don't download any software outside of the download center so I know where all my programs are coming from. All I use my ubuntu laptop for is surfing the web and messing with my phone. My laptop doesn't need an antivirus any more than my phone does. And my phone doesn't need any antivirus. People get stuck on that windows mentality (antivirus/task killers/memory managers).
Sent from my cm7 Aria.
Have never used an Antivirus on my phone I actually don't see how it's really of any use .-.
Everything I download app wise is from the Market and other than that I don't download anything besides a pic here and there
A virus cannot do anything malicious on Android or Linux without permissions, so I think antivirus can only protect a Linux computer or android phone from the user (who has to grant the permissions)...therefore I believe antivirus on android is mostly useless
Sent from my Liberty using XDA App
Hey guys.. I was wondering that why there is no option to download android apps on PC? I don't see any reason for why not apart from the different hardware of devices due to which not every device supports every app. But can't we just select our handset and then search for the apps?
By the way, please delete this thread if it's already been started before!
We can very much download apps to the PC. Some of the sites provide downloading only on scanning the QR code from the phone, but there r many many other sites wer u can download the apks on ur PC, like I do since I have no GPRS/3G/WiFi accounts on my phone yet.
A great list of such sites :
www.download.pandaapp.com
www.getandroidstuff.com
www.androidsoft4u.com
www.andappstore.com
www.mobiles24.com
www.bestandroiddownloads.com
www.freeware4android.net
www.slideme.org
www.android-themes.com
www.freewarelovers.com
www.androiddownloadz.com
www.downloadandroid.info
www.freeapk.com
www.androidappsfree.blogspot.com
www.mobile.softpedia.com
Hey!
I was looking for something like Apple's App Store, something official. But anyways, thanks alot!
With minor hacking you can install the official Android Market on you PC inside the official Android Emulator as well as x86 port of Android running on PC hardware. There are a lot of guides explaining how to do this online.
Here is an example:
http://www.howtogeek.com/howto/2186...ndroid-market-in-the-google-android-emulator/
p.s. This is off topic... I know people use this all the time and I certainly don't have the best grammar myself, but I just wanted to point out that "alot" is not a word in the English language. No one seems to mind little things like that when posting online, but I happen to see students using it all the time in their papers and it is wrong. They use "alot" and when it should just be "a lot".
Hello XDA
I've written a security guide I have posted to quite a few Android communities/forums. This guide is intended for new users to Android so probably doesn't apply to anyone here. But I do think Android users deserve solid advice from the experts and with all the media scare tactics going around, now more than ever.
However, I was hoping that if some Devs had the time, they could give some of it a quick read. I'm hoping to get a more informed developer opinion on whether I missed anything or am mis-representing something or another. I'd like to make sure that my information is as accurate as possible, and since Android is a community thang, I figure why not ask some other devs if they want to have a look and chime in.
The one topic I havent really yet covered is rooting, so I know at least that much is missing.
Thanks in advance and please feel free to post all feedback -- positive/negative/or your favorite cheesecake recipe.
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Background about Android
The first thing when understanding the security of your phone is to know a little bit about what makes it tick. Android is a 'lite' version of Linux with most applications that you download from the market written in Java.
The reason that this is important to know is that it means Android is very unlikely to ever get a 'virus' in the traditional sense. Part of the reason why is because Linux is a fairly secure operating system that protects various parts of itself from other parts. This is similar to how Windows has admin accounts and limited user accounts. Because of this protection, applications downloaded from the market do not have access to anything by default. You must grant them permission for each activity they want to perform when they are installed. This is a very important point which we will address a bit later. Also due to some bad choices by Google, there are a few exceptions to this rule that we'll talk about in the permissions section.
Nevertheless, while Android is very unlikely to get a 'virus', that does not mean you are completely safe from 'malware', 'spyware', or other harmful types of programs.
Types of Dangerous Programs
Probably the biggest/most common threats from applications on Android are:
1) When the developer/app tricks the user into giving the app permissions it does not need to do its job
2) When the app hides malicious code behind legitimate permissions.
3) When the app tricks the user into entering in personal information or sensitive data (such as a credit card number)
There are various ways malicious developers (also knowns as hackers or crackers) accomplish this. We'll briefly define each kind just to have a common understanding of the terms.
Malware
Malware generally is an all-encompassing term used to describe any harmful program. This includes spyware, viruses, and phishing scams (sometimes).
Spyware
Spyware is used to describe software or applications that read your information and data without you actually knowing it and reporting it back to some unknown third party for nefarious purposes. Often times this includes keystroke loggers to steal passwords or credit card information. Some people include certain types of Advertising tracking in this category (sometimes called Adware, see below). However that's a much larger debate we wont cover here.
Phishing
Phishing and spyware are closely related. They work on a similar principle: tricking the user and sending user information to a 3rd party to steal it. The difference with phishing however, is that the application (or website) will pretend to be from a trusted source to try and 'trick' you into entering in your details. Contrastly spyware would try to hide itself from being known to the user. One way to think about the difference is that phishing is masquerading while spyware is hiding, but the end goal of stealing your data is the same.
An example of this would be a app or website pretending to be affiliated with your bank or Paypal or your email provider (Gmail, Hotmail, Yahoo). However it can, and does, include any service where someone might want to steal your identity or password.
There have been known successfull phising attacks releated to at least one bank on Android.
Virus
The definition of virus used to be more all-encompassing. These days that term has been replaced by malware. Virus is more typically used to describe a specific type of software that takes control of your operating system and either damages it, or uses it for its own purposes. An example might be when a virus send emails to everyone in your email address book. Again this is the type of program least likely to be a problem for Android.
Trojan Horse
A trojan horse is really just a specific type of virus. It merely refers to the idea that the app pretends to be something useful or helpful or fun for the user while actually causing harm or stealing data. This term is often used to describe spyware and phishing attacks as well.
Adware
Adware is typically a bit of a grey area. Sometimes this is also called nuisance-ware. This type of application will often show the users an excessive amount of advertising in return for providing a service to the user of dubious quality. However, this type of program can often be confused with legitimate ad-supported software, which shows a mild to moderate amount of advertising while providing a useful service that the user wants. Because it can be hard to tell the difference, there exists a grey area from most anti-virus companies as to how to handle adware.
Warez
This is a term you'll sometimes hear referring to 'pirated' or unlicensed software. Often times warez forums and websites will offer "free apps" or "apks" (Android Package).
Don't be fooled by these sites, and do NOT download these files and load them to your phone. These files are stolen from the real developers by unscrupulous people who have no regard for the work put into apps by the developers, or the law. Often times they will even try making money off of the advertising on their "warez" forums. They are profiteers that do the entire Android community a great disservice, and hurt the developers. Furthermore this is very often the most popular 'vector' (method) of attack that malware writers use. Some go as far as stealing apps and putting them on the Android Market itself under different names.
If you are a user that cannot access the paid Android Market, there are alternatives these days. The most trustworthy markets (in my opinion) are the following:
- Android (Google) Market
- Amazon Appstore
- SlideMe
- Archos AppsLib
- AndAppStore (possibly)
- AndroidTapp (possibly)
- Verizon's Market (not sure if this is live yet)
- Motorola's Market (not sure if live or where, might be focused on Latin America?)
Other than these markets, I would not advise anyone to download and install an app from anywhere else.
However there are a few exceptions related to open source. These are places that independent developers can upload free and/open source apps. They don't guarantee your safety (nothing does) but they are not warez sites and are much more likely to be safe.
Open source or free apps: (very likely safe, not warez)
- XDA Developers
- Googlecode
- GitHub
How to Protect Yourself
There are no full-proof ways to avoid all bad situations in the world, but any sane person with a reasonable head on their shoulders knows that a few good habits can keep you safe for a long, long time in whatever you do. Here are a few tips I have learned from many years as a professional software developer and from reading these forums that have many people smarter and more knowledgeable than I about Android
Read the comments in the Market
This should go without saying. Before you download any applications, be sure to read the comments. Don't just read the first three either, click through and see what people are saying. This can also help you understand how well an app work on your particular phone or your particular version of Android. Comments should also be read EVERY time you update an app.
Check the Rating
Any app that fails to maintain abpve 2.5 stars is likely not worth your time. If you are brave enough to be one of the first few to download an app, this does not apply to you. Nevertheless almost all good apps have between 3 and 5 stars. To me, this is just a general rule to help find quality apps.
Check the permissions
There are many things an app can do to, and for, your phone. But anything an app can do is told to you when you download and install it. Before you download and install an app, you will be shown a list of permissions the application is requesting. Read them. Try your best to understand them in terms of what the application is supposed to do for you. For example, if you download a game of checkers, and the Market warns you that it wants to be able to read your contacts, you should think twice and probably not download it. There is no sane reason a game of checkers needs to know your friend's phone numbers.
To see the permissions given to an application after installation, go to the Market, press [menu], then [downloads] or [my apps], then select the app, press [menu] again, then press [security].
Below I have a list of some of the most commonly used permissions. The list has explanations of how important they are, what they do, and what types of apps might legitimately need them. This should help you get a basic understanding of what to allow and when to skip an app. Please feel free to ask about a permission or let me know if I have missed any.
Check the developer's website
Make sure the developer has a website and not just some Wordpress blog. This is often again a good indication of quality as well as safety. If the developer cares about their app they will likely have a relatively nice looking website or, if they are open source, a site on Google Code. Note: sites on Google code are NOT verified or approved by Google. However, open source is usually (but not always) more likely to indicate a safe application.
NOTE: This is not definitive indicator if a developer is good or bad, just one more peice of information you can use. Their are a lot of exceptions to this particular rule, as a lot of Good devs might not have anything more than a Blogger blog, and a lot of bad devs could just point to a nice looking site they have no affiliation with. However, the developer's website can be helpful just as an extra peice of information you can use in making your decision about the developer or app.
Updating applications is the same as installing them fresh
Each time you update an application on your phone, you should use the same diligence as if you were installing it for the first time. Reread the permissions to see that it is only asking for what it needs and no more. Reread the comments to see if anything has changed in the opinions of the users and to see if it still works for your phone. If you see that an application says Update (manual) next to it, that means the developer has CHANGED the permissions they are requesting from the version you have on your phone. This is not necessarily a bad thing -- but it should indicate that you should pay a bit closer attention to the permissions and re-evaluate them as needed.
If you are still unsure, ask around -- the community is your anti-virus
If you see an app you want, but it seems to be asking for more permissions that it should, or it's comments and ratings are mediocre, go ahead and ask about the app in these (and other) forums. You will often find dozens if not more people who know the answers and another whole bunch wishing to know the answers to the same questions you have.
I can't stress this point enough. This is the best part about Android. The community are usually the first to identify any Malware or dangerous programs, and are the best resource for finding quality apps.
Beware the Sockpuppets, Shills, and Spammers
However, like anything, don't believe everything you read. Someone who comes into a forum telling you an app is the "best" may be what's referred to as a sockpuppet or shill. I tend to be wary of people with low post counts, or who have unreasonably high praise for what seems a simple app, or anyone using the word "best" in a forced context.
Now these people are not all bad, some may just be excited, or not speak english as their first language. But it's common for sockpuppets to use the term "best" to try and get better search rankings on Google. Saying things like "Best Android App" "Best GPS." Other tell-tale signs include when they mention software for iPhone or other platforms without actually answering questions. Or just generally seem like their post is out of context or overly general (think about how horoscopes are made for everyone to relate to them). I often get spam on my blog that says things like "best blog post! love your writing style, you put things in perspective for me" which makes no sense when my blog was about my new app.
This is a fine line a very much a grey area though. Sometimes it can be very hard to tell if someone is a spammer. If you see a post or comment in the market you suspect is spam on a forum, report it to the mods, don't reply and start an argument.
Posting your own comments
After you have downloaded an app you can post you own comments. The comment will be visible to all other android users but it will only show your first name. To do this go into the Market and press [menu] > [downloads]. You should see five empty stars at the top which you can tap to rate the app. Once you have rated the app you should see an option to add a comment under the stars.
Being a good user
While this guide is about security, I think it's important to point out how to be a good user too. Android is a community and stems from open source and will only ever be as good as both it's developers and it's users.
So, if an app is crashing on you, try emailing the developer before uninstalling and posting an angry comment. Anything you post in the market will stay even if you have uninstalled the app, and you could do serious harm to a developer's reputation if you post very negative comments.
If you think the developer just made a mistake, or didnt support your phone, work with them. If they are unhelpful, then you can consider giving them a bad rating. This is especially true for free apps in the market. Remember that you, as a user are not "entitled" to perfect free apps. Most developers do not have Google's enginnering and QA team backing them up and even Google makes mistakes.
And while it's frustrating when things don't work, imagine how frustrating it is when you put long hours into something but make a mistake -- and then because of that mistake you can never fix the damage done by a rude commenter.
What does Google do to protect us?
Unfortunately at the moment, not a lot. They do police the market to a small extent and investigate any reports of malware. They several instances of Malware and actually remotely uninstalled the applications from users phones.
However, the Market is not like the Apple App Store or Amazon Appstore, there is no screening of applications before they are posted to the market. There are no draconian procedures or lengthy approval processes that developers have to go through to post applications. All that a developer needs to do is to 'digitally self sign' his or her application before posting it. This helps Google track any developers with ill intent, but it's just a way to manage malware after it is discovered.
What about Wi-Fi?
One of the things to remember when trying to keep yourself safe is to be very careful with public Wi-Fi. Whenever you connect to the internet through a public Wi-Fi you should never use any website that requires a password to sign into. The danger here is because you have no idea who is connecting you to the website your are trying to connect to. A good analogy would be like trying to mail a letter to your friend by giving it to a stranger in the street.
[guide continues below]
Permissions
When you install an application the Market will tell you all of the permissions it needs to function. These are important to read as it can give you an idea if the application is asking for permission to do more than it needs. While some legitimate apps often ask for more permission than they need, it should at least raise an eyebrow when deciding if an application is safe and of good quality.
NOTE: there are also some backwards compatibility decisions Google has made that will grant apps targeting 1.5 or earlier two permissions you may never see requested. It is my belief this is a security hole, but not a large one. The permissions are Read Phone State and Identity and Write/Delete files from the SD. I will elaborate on those below.
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Services that cost you money
make phone calls
This permission is of moderate to high importance. This could let an application call a 1-900 number and charge you money. However this is not a common to cheat people in today's world. Legitimate applications that use this include: Google voice and Google Maps
Services that cost you money
send SMS or MMS
This permission is of moderate to high importance. This could let an application send an SMS on your behalf, and much like the phone call feature above, it could cost you money. Certain SMS numbers work much like 1-900 numbers and automatically charge your phone company money when you send them an SMS.
Storage
modify/delete SD card contents
This permission is of high importance. This will allow the applications to read, write, and delete anything stored on your phone's SD card. This includes, pictures, videos, mp3s, and even data written to your SD card by other applications. However there are many legitimate uses for this permission. Many people want their applications to store data on the SD card, and any application that stores information on the SD card will need this permission. You will have to use your own judgment and be cautious with this permission knowing it is very powerful but very very commonly used by legitimate applications. Applications that typically need this permission include (but are not limited to): camera applications, video applications, note taking apps, backup applications.
WARNING: Any app targeting Android 1.5 or below (possibly 1.6 as well) will be granted this permission BY DEFAULT. And you may not ever be warned about it. It is important to pay attention to what version of Android an app is targeting to know if this permission is being granted. You can see this on the Market website in the right hand column.
Your personal information
read contact data, write contact data
This permission is of high importance. Unless an app explicitly states a specific feature that it would use your contact list for, there isn't much of a reason to give an application this permission. The one exception to that rule includes typing or note taking applications and/or quick-dial type applications. Those might require your contact information to help make suggestions to you as you type. Typical application that require this permission include: social networking apps, typing/note taking apps, SMS replacement apps, contact management apps.
Your personal information
read calendar data, write calendar data
This permission is of moderate to high importance. While most people would consider their calendar information slightly less important than their list of contacts and friends, this permission should still be treated with care when allowing applications access.
Phone calls
read phone state and identity
This permission is of moderate to high importance. Unfortunately this permission seems to be a bit of a mixed bag. While it's perfectly normal for an application to want to know if you are on the phone or getting a call, this permission also gives an application access to 2 unique numbers that can identify your phone. The numbers are the IMEI, and IMSI. Many software developers legitamately use these numbers as a means of tracking piracy though.
WARNING: Any app targeting Android 1.5 or below (possibly 1.6 as well) will be granted this permission BY DEFAULT. And you may not ever be warned about it. It is important to pay attention to what version of Android an app is targeting to know if this permission is being granted. You can see this on the Market website in the right hand column.
Your location
fine (GPS) location
While not a danger for stealing any of your personal information, this will allow an application to track where you are. Typical applications that might need this include (but are not limited to) restaurant directories, movie theater finders, and mapping applications. This can sometimes be used for location based services and advertising.
Your location
coarse (network-based) location
This setting is almost identical to the above GPS location permission, except that it is less precise when tracking your location. This can sometimes be used for location based services and advertising.
Network Communication
create Bluetooth connection
Bluetooth (Wikipedia: Bluetooth - Wikipedia, the free encyclopedia) is a technology that lets your phone communicate wirelessly over short distances. It is similar to Wi-fi in many ways. It itself is not a danger to your phone, but it does enable a way for an application to send and receive data from other devices. Typical applications that would need bluetooth access include: Sharing applications, file transfer apps, apps that connect to headset out wireless speakers.
Network Communication
full internet access
This is probably the most important permission you will want to pay attention to. Many apps will request this but not all need it. For any malware to truly be effective it needs a means by which to transfer data off of your phone, this is one of the setting it would definitely have to ask for.
However, in this day and age of cloud computing and always-on internet connectivity, many, many legitimate applications also request this.
You will have to be very careful with this setting and use your judgment. It should always pique your interest to think about whether your application needs this permission. Typical applications that would use this include but are not limited to: web browsers, social networking applications, internet radio, cloud computing applications, weather widgets, and many, many more. This permission can also be used to serve Advertising, and to validate that you app is licensed. (See DRM for more info).
Network communication
view network state, view Wi-Fi state
This permission is of low importance as it will only allow an application to tell if you are connected to the internet via 3G or Wi-Fi.
System tools
Prevent phone from sleeping
This is almost always harmless. An application sometimes expects the user to not interact with the phone directly sometimes, and as such would need to keep the phone from going to sleep so that the user can still use the application. Many applications will often request this permission. Typical applications that use this are: Video players, e-readers, alarm clock 'dock' views and many more.
System tools
Modify global system settings
This permission is pretty important but only has the possibility of moderate impact. Global settings are pretty much anything you would find under Android's main 'settings' window. However there are a lot of these setting that are perfectly reasonable for an application to want to change. Typical applications that would use this include: Volume control widget, notifications, widgets, settings widgets.
System tools
read sync settings
This permission is of low impact. It merely allows the application to know if you have background data sync (such as for Facebook or Gmail) turned on or off.
System tools
Write Access Point name settings
I need a bit of clarification on this setting myself. I believe this relates to turning on and off wifi and your 3G data network. (if someone can comment and clarify I would greatly appreciate it and update this guide to reflect). Essentially however I believe this to be similar to the 'modify global settings' permission above.
System tools
automatically start at boot
This permission is of low to moderate impact. It will allow an application to tell Android to run the application every time you start your phone. While not a danger in an of itself, it can point to an applications intent.
System tools
restart other applications
This permission is of low to moderate impact. It will allow an application to tell Android to 'kill' the process of another application. However that application should have the option of immediately restarting itself.
System tools
retrieve running applications
This permission is of moderate impact. It will allow an application to find out what other applications are running on your phone. While not a danger in an of itself, it would be a useful tool for someone trying to steal your data. Typical legitimate applications that require this permission include: task killers and battery history widgets.
System tools
set preferred applications
This permission is of moderate impact. It will allow an application to set the default application for any task in Android. For instance clicking on a hyperlink in your email will bring up a browser. However if you have more than one browser on your phone, you may want to have one set as your 'preferred' browser. Typical legitimate applications that require this permission include any applications that replace, compliment, or augment default Android functionality. Examples of this include web browsers, enhanced keyboards, email applications, Facebook applications and many more.
Hardware controls
control vibrator
This permission is of low importance (but could be lots of fun). As it states, it lets an app control the vibrate function on your phone. This includes for incoming calls and other events.
Hardware controls
take pictures
This permission is of low importance. As it states, it lets an app control the camera function on your phone.
Your accounts discover known accounts
This permission is of moderate importance. This allows the application to read what accounts you have and the usernames associated with them. It allows the app to interact with permission related to that account. An example would be an app that was restoring your contact, would discover your google account then sned you to Google's login screen. It doesnt actually get to see your password, but it gets to work with the account.
Development Tools read logs
This permission is of very high importance. This allows the application to read what any other applications have written as debugging/logging code. This can reveal some very sensistive information. There are almost no reasons an applications needs this permission. The only apps I might grant this permission to would be Google apps.
What Does it All Mean? This Sounds so Scary!
It might sound that way but it is not, by any means, scary. The power of the market is actually due to the fact that developers are free to post updates and applications much more quickly and easily. But despite the security risks that this model creates, there is an incredibly powerful deterrent to malware in the community itself. Lots of people on these boards and in the market eagerly try out new apps and report back the safety and quality.
Again, the community is your best anti-virus app.
last updated: March 23, 2011
This guide by Lost Packet Software is licensed under a Creative Commons Attribution-No Derivative Works 3.0 United States License.
Good post.
Yes, well written and informative. As a developer, it's good to get this information into user's hands who may not know how permissions work. And the author makes some good points on how to be safe without massive fear of EVER downloading an app
Thanks to OP for a nice article. Do you mind if I copy it and post it on my website? You can send me a PM. Of course, I will cite you as the original source
Thanks much guys,
@Rootstonian
Yes you can copy it, but copy the one from my site http://alostpacket.com/2010/02/20/how-to-be-safe-find-trusted-apps-avoid-viruses/ as it has a few less typos.
It is licensed under the creative commons license (no derivative works, must attribute to me). This means you are free to copy/republish but you have to copy the whole thing and not change it.
Well written and informative! Thanks.
Ok, thanks. I'll either copy it in its entirety or just use the link you provided if that's ok.
Regardless, you work will be properly cited
Again, well done.
thanks much guys.
Also curious if anyone has found any errors or inaccuracies or misrepresentations etc.
Brilliant post.
There is a virus inside elternal legacy HD (especially) and asphalt 6!
DO NOT DOWNLOAD THESE FROM ***!!!
It will take you to a fake gameloft survey where you say your country and favourite os, and when you touch "send", it says 'thank you for your donation' and sends infinite messages, charging your phone bill. The only way to stop this is battery remove or task killer.
I wasn't one of the victims!
That's why you should only download apps with descriptions and developer names
Thus, thou shall not use warez.
+1 yup.............
AVG android id's virus in GingerBreak?
Just by dumb luck, I had loaded avg pro on atrix. When blithlely following directions to load GingerBreak, received message from avg that program contains a virus and I conclude that either: 1. I had to unload avg and then load GingerBreak or 2. ask in this forum if this message is for real. Any and all responses will be welcome.
Thats the reason why i deleted *** from my Phone! There are so much Viruses, in which you will have to pay. If you want to be safe, buy them at the Android Market!
Regards
*** is down anyways now... so peace
Sent from my PC36100 using XDA Premium App
The problem is that the android market is also not safe from viruses (although, probably more safe since it's monitored by Google and they can remotely remove malicious apps...).
I currently use lookout but wondering if there is a better antivirus.
How is AVG ? I'm using it on my desktop computer and like it but somehow got the feeling that it's too "heavy" for Android.
Morning mate,
You can use ESET. Has has now their own AV. EMS (Eset Mobile Security) You can grab it from the market, currently in a BETA stage but quite advance and very low footprint on any device. It's definitely on the same playing field as any awesome Antivirus/Malware prevention tool.
Regards,
fluxgfx
Muzikant said:
The problem is that the android market is also not safe from viruses (although, probably more safe since it's monitored by Google and they can remotely remove malicious apps...).
I currently use lookout but wondering if there is a better antivirus.
How is AVG ? I'm using it on my desktop computer and like it but somehow got the feeling that it's too "heavy" for Android.
Click to expand...
Click to collapse
I used ESET for a while. I use it on my PC and my laptop, so when I saw it in the market, I got to installing it right away.
It slowed down my phone horribly and no matter what I did, I wasn't able to uninstall it (My phone was not rooted at the time). After trying everything I found on the web, I eventually got to backing up everything I had and factory reseting...
They've probably fixed that bug by now, but it was still pretty annoying...
Can anyone recommend any other Android anti-virus software? It has to be "good", obviously, but it also has to quietly run in the background, eat as little battery and memory as possible.
P.S. My device is a Galaxy ACE (currently rooted and with leaked Android 2.3.4 firmware)
On the PC I used and removed Eset. It was a real pain spending huge amounts of time removing junk deeply imbedded and left behind in the Registry. As such, I'd be hesitant to try Eset again especially on an Android device. Furthermore, I read where Eset used their own secret vpn to bypass any local firewall to get updates, without telling the user.
I am skeptical of reviews by AV publishers like McAfee, Kaspersky, etc. warning of "the coming horrible tsunami of Android malware."
If anyone comes across a detailed Android AV review, please post the link.
no warez discussion allowed.
I see, no one was actually advertising/ requesting or posting warez, so there will be no consequences.
but since this is not an issue for anybody, not using warez in the first place, this thread is closed. if you got yourself a virus this way, there are enough tips to get rid of it, but it is your own fault.
also, i edited all the posts containing the name of the warez distributer.
closed.