Posts Categorized: Mobile


DIY cybercrime-friendly (legitimate) APK injecting/decompiling app spotted in the wild

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With millions of Android users continuing to acquire new apps through Google Play, cybercriminals continue looking for efficient and profitable ways to infiltrate Android’s marketplace using a variety of TTPs (tactics, techniques and procedures). Largely relying on the ubiquitous for the cybercrime ecosystem, affiliate network based revenue sharing scheme, segmented cybercrime-friendly underground traffic exchanges, as well as mass and efficient compromise of legitimate Web sites, for the purpose of hijacking legitimate traffic, the market segment for Android malware continues flourishing. We’ve recently spotted, yet another, commercially available DIY cybercrime-friendly (legitimate) APK injecting/decompiling app. The tool is capable of facilitating premium-rate SMS fraud on […]

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Fake Reviews Trick Google Play Users

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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 […]

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5M+ harvested Russian mobile numbers service exposes fraudulent infrastructure

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Cybercriminals continue adapting to the exponential penetration of mobile devices through the systematic release of DIY (do-it-yourself) mobile number harvesting tools, successfully setting up the foundations for commercial managed/on demand mobile phone number harvesting services, ultimately leading to an influx of mobile  malware/spam campaigns. In addition to boutique based DIY operations, sophisticated, ‘innovation’ and market development-oriented cybercriminals are actively working on the development of commercially available Android-based botnet generating tools, further fueling growth into the market segment. In a series of blog posts, we’ve been profiling multiple cybercrime-friendly services/malicious Android-based underground market releases, further highlighting the professionalization of the market […]

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Solving the mystery of incidence response

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The threat landscape today is very different from a few years ago. With an increasingly creative number of threat vectors through which to launch an attack, it has never been more challenging to secure our data and devices in all the ways we connect. In today’s hyper-dynamic landscape, well over 8 million malware variants are discovered each month. The majority are financially motivated, very low in volume and very sophisticated. On the mobile front, cybercriminals have shown a clear focus on compromising devices made evident by an explosion in the discovery of malicious mobile apps and websites. Also on the […]

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Can Security Survive in an Increasingly Insecure World?

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2013 was not a good year in terms of cyber security. Despite companies spending an increasingly significant percent of revenue on security technology – systems designed to thwart, detect and prevent hackers from gaining access to their networks and sensitive data – attacks continue to succeed. Recently, the trend has shifted to attacking point of sale (POS) systems. While Target is the largest example, similar attacks have occurred in industries ranging from department stores to hospitals to hotel chains. Basically anywhere large scale financial transactions take place. The focus on POS systems doesn’t come as a surprise. Cybercriminals have always […]

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SMS Trojans Using Adult Content On The Rise In Android

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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 […]

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Cybercrime Trends 2013 – Year in Review

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It’s that time of the year! The moment when we reflect back on the cybercrime tactics, techniques and procedures (TTPs) that shaped 2013, in order to constructively speculate on what’s to come for 2014 in terms of fraudulent and malicious campaigns, orchestrated by opportunistic cybercriminal adversaries across the globe. Throughout 2013, we continued to observe and profile TTPs, which were crucial for the success, profitability and growth of the cybercrime ecosystem internationally, such as, for instance, widespread proliferation of the campaigns, professionalism and the implementation of basic business/economic/marketing concepts, improved QA (Quality Assurance), vertical integration in an attempt to occupy […]

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Mobile Security 2014: Predictions

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The most recent and interesting threats we see are more or less “evolved” forms of previous threats, including those originating from the PC side. People have been “spoofing” parts of apps, such as code, appearance, or digital certificates, since Android malware first started appearing. The MasterKey exploit was a whole new way to modify the app without even having to spoof anything (since this was the exploit which allowed applications to be changed without invalidating the existing digital signature). It’s also very interesting to see how threats like Zitmo or RAT-type apps seem to get better and better at mirroring […]

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Compromised legitimate Web sites expose users to malicious Java/Symbian/Android “Browser Updates”

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We’ve just intercepted a currently active malicious campaign, relying on redirectors placed at compromised/hacked legitimate Web sites, for the purpose of hijacking the legitimate traffic and directly exposing it to multi mobile OS based malicious/fraudulent content. In this particular case, a bogus “Browser Update“, which in reality is a premium rate SMS malware.

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Cybercriminals release new commercially available Android/BlackBerry supporting mobile malware bot

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Thanks to the growing adoption of mobile banking, in combination with the utilization of mobile devices to conduct financial transactions, opportunistic cybercriminals are quickly capitalizing on this emerging market segment.  Made evident by the release of Android/BlackBerry compatible mobile malware bots. This site is empowering potential cybercriminals with the necessary ‘know-how’ when it comes to ‘cashing out’ compromised accounts of E-banking victims who have opted-in to receive SMS notifications/phone verification, whenever a particular set of financial events take place on their bank accounts. A new commercially available Android, BlackBerry (work in progress) — supporting mobile malware bot is being pitched by […]

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