The proposed source code for a powerful Android malware program, that steals online banking credentials has been leaked according to reserchers with IBM has been leaked.The malware family is known by several names, including GM Bot, Slempo, Bankosy, Acecard, Slempo and MazarBot.
Limor Kessem, a cybersecurity analyst with IBM Trusteer, said “GM Bot has been sold on underground hacking forums for around US$500. But it appears someone who bought the code then leaked it on a forum in December, perhaps to increase his standing.”
“He indicated he would give the password to the archive only to active forum members who approached him. Those who received the password in turn passed it on to other, unintended users, so the actual distribution of the code went well beyond that discussion board’s member list. While GM Bot may not be as prolific as the major banking Trojans mentioned here, it is definitely a game changer in the realm of mobile threats.” Limor added.
Emerged in late 2014 on Russian-speaking forums, GM Bot exploits an issue known as activity hijacking in older Android devices that allow an overlay to be displayed over a legitimate application. Google has put in defenses against activity hijacking in Android versions higher than 5.0.
The overlay looks like what a user would expect to see after launching a legitimate banking app, but that app is actually running underneath the overlay. The user then inputs their authentication credentials, which are sent to the attackers.Since GM Bot has full control over the device, it can also steal SMSes, such as one-time authentication codes.
Since the leak of GM Bot’s code, it appears its creators have developed a second version “which is sold in financial fraud-themed underground boards,” Kessem concluded.
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