Here at Webroot, we are constantly on the lookout for malevolent Android apps. In most cases, you do something malicious with your app and you get marked accordingly, but it’s not always that simple. Two weeks ago an app called “Virus Shield” popped up on the Google Play store. Within days, Virus Shield became Google Play’s #1 paid app. With thousands of reviews and a 4.7 star rating, who would question it? Well, a few people did, the code was looked at, and Google pulled it from the store. They have even gone as far as to make amends with those […]
Posts by Nathan Collier:
In the marketing world, it’s widely known sex sells. This is so true the “adult” industry is a multi-billion dollar industry. This is also why malware authors have long used adult content to attract unwitting victims. Lately, this threat researcher has seen way too much of it. There has been an influx of Trojan-like APKs using adult content to trick users into sending premium SMS messages. Let’s take a deeper look at one of these apps. When you open the app it displays a page showing “GET IT NOW” in the middle, and “NEXT” at the lower right corner. If […]
In this episode of ThreatVlog, Nathan Collier covers the old, but still around, SMS Fake Installer, a Russian based program used to trick phone users to send premium text messages, costing money to the user. Nathan talks about how these threats work, how this threat is different, and the easiest way to stay protected on your Android powered phone.
By Nathan Collier Last Friday we blogged about the radical Android OS bug 8219321, better known as the “Master Key” bug, which was reported by Bluebox Security. Check out last weeks blog if you haven’t already: “The implications are huge!” – The Master Key Bug. We mentioned how we have been diligently working on protecting those not yet covered by patches or updates, and finding a solution for older devices as well. We are happy to report we have the solution! The newest version of Webroot SecureAnywhere Mobile with a patch for the “Master Key” bug can be found on the […]
By Nathan Collier and Cameron Palan Last week, Bluebox Security reported they’d found a new flaw with the Android OS, saying “The implications are huge!”. The bug, also known as the “Master Key” bug or “bug 8219321”, can be exploited as a way to modify Android application files, specifically the code within them, without breaking the cryptographic signature. We call these signatures the “digital certificate”, and they are used to verify the app’s integrity. Since the bug is able to modify an application and still have the certificate appear valid, it is a big deal.
By Nathan Collier There’s one variant of Android.Bankun that is particularly interesting to me. When you look at the manifest it doesn’t have even one permission. Even wallpaper apps have internet permissions. Having no permissions isn’t a red flag for being malicious though. In fact, it may even make you lean towards it being legitimate. There is one thing that thing that gives Android.Bankun a red flag though. The package name of com.google.bankun instantly makes me think something is fishy. To the average user the word ‘Google’ is seen as a word to be trusted. This is especially true when […]
Android.RoidSec has the package name “cn.phoneSync”, but an application name of “wifi signal Fix”. From a ‘Malware 101′ standpoint, you would think the creators would have a descriptive package name that matches the application name. Not so, in this case. So what is Android.RoidSec? It’s a nasty, malicious app that sits in the background (and avoids installing any launcher icon) while collecting all sorts of info-stealing goodness.
By Cameron Palan and Nathan Collier Recently, we discovered a new malicious Android application called Android.MouaBot. This malicious software is a bot contained within another basic app; in this case, a Chinese calculator application. Behind the scenes, it automatically sends an SMS message to an auto-reply number which replies back to the phone with a set of commands/keywords. This message is then parsed and the various plugins within the malicious packages are run or enabled.
We have found a new threat we are calling Android.TechnoReaper. This malware has two parts: a downloader available on the Google Play Market and the spyware app it downloads. The downloaders are disguised as font installing apps, as seen below:
When you’re a threat researcher, you are always on the look out for anything that looks ‘phishy’, even if it’s on your own personal time. Today, I opened my personal email to find this: Although the email looked very convincing, I don’t bank with Smile Bank so I knew something was up. Smile Bank is an actual bank based in the UK. The bad guys used a spoofed email address to make it look like it came from the legit Smile Bank domain smile.co.uk. If someone did bank with Smile Bank, I can see how they could easily be tricked. It’s […]