Cyber-criminals are now selling tools need to repackage and Trojanize legitimate Google Android applications with a remote access tool known as AndroRat.
According to researchers at Symantec, the tools are called binders. When used in conjunction with AndroRat, an attacker with limited expertise can automate the process of Trojanizing any legitimate Android application with the malware. AndroRat first appeared late last year on underground forums.
When the binders are used, the user unsuspectingly gets AndroRAT alongside the legitimate app they intended to install. As of July 16, Symantec has counted 23 cases of popular legitimate apps being Trojanized in the wild with AndroRAT. There are only several hundred infections of AndroRAT so far worldwide, with the United States and Turkey being the most targeted countries. The number of infections however is rising, Lelli noted.
Google Android security has been in the news recently due to the disclosure of a master key vulnerability that could be used to Trojanize legitimate apps. Proof-of-concept code for the flaw, which was uncovered by Bluebox Security, was published online by a researcher with vendor viaForensics.
Google has pushed out a patch for Google Android to fix the vulnerability, and Google Play scans for the issue. Google’s Verification Tool is also able to offer protection for Android users who download their apps from other app stores. Some of the company’s OEM partners, such as Samsung, are already shipping a fix to their Android devices, Google told SecurityWeek last week.
“The evolution of remote access tools moving onto the Android platform was predicted,” Lelli blogged. “While AndroRAT is not showing a particularly high level of sophistication just yet, with the open source nature of its code and with its popularity growing, it has potential to evolve and grow into a more serious threat.”