Android antivirus apps a complete waste of time | Hacker News Reader

Android antivirus apps a complete waste of time

extremetech.com

33 pointsukdm26 comments

I had an odd thought reading this article. I wonder if what might be considered malware could actually be a legitimate agreement between the user and the programmer?

Something like "Instead of a subscription, I'm going to SMS these 3 numbers once a month and it's going to cost you five bucks"

This actually might bypass all the headaches folks are having with merchant accounts and payment plans and work out as something both the user and developer might like a lot better. If crooks can make millions charging for bogus SMS messages, why can't legitimate programmers use the same payment mechanism for stuff the users like?

Don't know. Just throwing it out there. What caught my eye was the assumption that any program using SMS to rack up charges was malware. Is that always a true statement?

> If crooks can make millions charging for bogus SMS messages, why can't legitimate programmers use the same payment mechanism for stuff the users like?

This exists; you see it occasionally for web games.

It's quite expensive, though, and I suspect it's not allowed on Android if you're in the marketplace; does Google allow you to use third-party payment stuff for marketplace apps?

Some apps use a separate paypal link that avoids the market.

Yeah, Google is pretty loose with their rules, and the Market structure passes a lot of complexity (ie, sales tax responsibility) on to each developer.

I'm seriously considering using something like BMT Micro to sell upgrades to a free app. The classic shareware model, more or less. I'd really like to sidestep all the annoyances and time overhead that come with selling stuff directly. I believe the iOS App Store is set up that way already (where you're effectively licensing them to sell your software and they're paying you royalties), but unfortunately not the Android Market.

The Android market passes sales tax responsibility to the developer? I hadn't realized that; that sounds absolutely ridiculous. How do small developers cope with it at all?

Yep, the iOS app store is effectively a publisher; the only tax complexities involved are countries which practice withholding (the US and Japan, in particular; unless you register with their tax authorities they withhold a percentage, even for countries with which they have tax treaties), and special treatment of royalties in some countries.

These results are unsurprising to me. But then again, my startup is building a cloud-based mobile-malware detection service to address the inherent limitations of anti-virus on mobile devices. :-)

Here's the problem: "Anti-virus" in general is limited because it relies on static signatures. Therefore it can only detect known malware and is vulnerable to evasion (polymorphism / metamorphism). On mobile devices AV is even more limited because of resource constraints (namely, limited battery and cpu).

By doing malware detection in the cloud, we have plentiful resources to do heavyweight analyses. We also get a better overall detection capability by using behavioral analyses instead of just static signatures (we actually run the apps).

If you're curious about the technical details, we presented at Black Hat in August. https://media.blackhat.com/bh-us-11/Daswani/BH_US_11_Daswani...

P.S. We’re hiring :-)

This isn't exactly the conclusion of the test it's reporting. That test said that free Android AV apps were poor-to-useless. But they included two commercial apps in the test, which fared pretty well (although not perfect).

>...but by far the best way to avoid malware infestation is to use a little common sense...

Also, people should stop wearing seatbelts, and just start driving better.

That's a poor analogy.

It's difficult to get infected with Android malware without directly installing questionable applications on your phone, but it is pretty easy to get into an accident through no fault of your own.

I think you (and the author) give the average user too much credit. To most people on HN, it's probably pretty obvious that downloading applications directly from sketchy sources is a good way to have your device become infected by malware, but the average user might not realize this. They might not even realize that a source is sketchy.

This is anecdotal, but after about the 10th time reinstalling my parents OS, I finally discovered that the root of all their malware-related problems stemmed from the fact that they were downloading music using Limewire. It hadn't crossed their minds that perhaps this was not a very good idea.

I'm sure they genuinely believed that their computer was repeatedly being infected "through no fault of their own".

The installation from non-market sources is disabled by default. The users have to go to settings and check the checkbox allowing side-loading of applications. So they will not install it by accident, it has to be wilfully.

Some websites and applications require you to allow third party apps to run their applications; and if those websites can get a seasoned computer user to change the setting, I imagine a less legitimate site could encourage the less informed to do the same.

I'm looking at you, GrooveShark.

hmm, it also mentions completely disabling 3rd party software sources, and not downloading stupid things from forums.

If you're developing for android, you're going to install your own APKs from sd card. Even if you "don't install other apps" that way, you're still "leaving the vector open" by leaving the system setting on, apparently?

Also, if you want to upgrade the OS or kernel on some of the cheaper phones, you'll need to use cyanogenmod, and usually a custom version hacked together by randomers on forums. My (cheap, spare) droid runs a bootloader and OS which is the result of collaboration between a Chinese guy, a British guy and other developers from "the internet". You do have to join the forums, talk to people a bit, and read up on the feedback these users get when they post new ROMs though, I'll admit...

Maybe I'll install one of these free AV apps and see if they can find anything! :)

Just like desktop AV?

Exactly, the same points made in this article applies to Windows aswell. Maybe Windows AV will be a few points better, but who cares? It gives users an equally dangerous false sense of security.

Yet, lots of people (both techs and non-techs) will think you are crazy if you dont use AV on your Windows PC. Its some sort of mass psycosis.

I think you unfairly characterize a lot of Windows AV. Yeah, they're not perfect - if you're browsing dodgy sites, downloading tons of cracks, and clicking on every link, there's no application on Earth that can stop you from getting infected.

However, an AV is pretty good at detecting stuff that you may get exposed to otherwise - exploits can pwn your Windows computer without you even knowing, and sometimes even run off legit ad networks. NoScript / AdBlock, running Google Chrome, and practicing safe browsing can help, but an AV is a good additional layer.

I guess my point is - an AV is NOT a panacea, but it should be used as an additional layer of defence.

Yeah, I never understood the purpose of anti-virus software. If you have a vulnerability that would allow a virus to make its way onto the machine enough for a virus scanner to find the virus, someone will use that same vulnerability to access your system in a way that a virus scanner will not protect you.

I should stop using my web browser and email client, and any other downloaded software that didn't come on my OS install disc?

I guess in a perfect world. Obviously that is not going to happen though.

Anti-virus software is like having airport security that only screens those that fit a certain profile. Someone not meeting that profile is going to walk onto a plane with the intent to do harm, at which point you are no further ahead than you were when you had no security checks at all.

I think you haven't kept up with recent developments in AV software. These days, they continue to monitor all those passengers even after they've gotten on the plane. And remember, there are a lot of different planes -- each of our individual machines -- and the AV software has also improved in its ability to see something bad on one of the planes and quickly notify the rest of us.

I realize AV software applies heuristics to identify some attacks, but in the absence of intent, it is impossible to do it effectively. One man's botnet is another man's legitimate computing cluster.

Unless you warn about everything going on in the system, you are not really aware of everything. If you do warn about everything, the user will start to ignore the warnings.

I've been running AVG for a month now on my Android and actually don't mind it. It doesn't appear to be draining my battery or affecting performance, and I like the thought that should I download something from the Market that IS in their database, it may catch it before I install. Even if it is a 1 in 10 shot.

As an avid iOS user, this is causing much head-scratching a la "viruses are a problem on Android? why? it's 2011..."

http://www.mostiwant.com/blog/virusbarrier-ios-first-antivir...

Quote therein: "there is no known malware for iOS".

This thing just sniffs for malware whose transmission vector may by coincidence pass thru an iOS device, like PDFs and Dropbox.

The paid apps blocked all malware apps from being installed, even those that were not spotted in the manual scans.

How does that make them useless?

This is one of the key advantages of the iOS App Store - the process of analyzing app capabilities and security is offloaded to Apple - users don't have to care about it.

Reply on news.ycombinator.com