Dridex/Locky Operators Unleash New Malware in Recent Attack

The threat actor(s) behind many Dridex and Locky campaigns have been using a new Remote Access Trojan (RAT), Proofpoint security researchers warn. Known as TA505, the attackers have been using malware dubbed tRat, which was written in Delphi and is modular in nature. The new piece of malware was first spotted at the end of September, when it was being spread by an unattributed actor. Malicious Word documents used in the attack used macros to download the RAT. The malware was picked up by TA505 last month and used in an attack on October 11, as part of an email campaign that used both Microsoft Word and Microsoft Publisher files for distribution purposes. The attack targeted users at commercial banking institutions. tRat, the security researchers say, achieves persistence by copying the binary to a directory in the AppData folder. Next, it creates a LNK file in the Startup directory to ensure the binary is executed when the system starts.