64-bit ZBOT Leverages Tor, Improves Evasion Techniques

2014-Jan-08 | Tags: antispywareantivirus

Start64!Reports have surfaced that ZeuS/ZBOT, the notorious online banking malware, is now targeting 64-bit systems. During our own investigation, we have confirmed that several ZBOT 32-bit samples (detected as TSPY_ZBOT.AAMV) do have an embedded 64-bit version (detected as TSPY64_ZBOT.AANP). However, our investigation also lead us to confirm other noteworthy routines of the malware, including its antimalware evasion techniques.



Like any ZBOT variant, TSPY_ZBOT.AAMV injects its code into the normal process explorer.exe. If the running process is 64-bit, the malware then loads the 64-bit version of the malware. If not, it will continue to execute the 32-bit version.

The other notable feature of this ZBOT variant is its Tor component, which can hide the malware’s communication to its command-and-control (C&C) servers. This component is embedded at the bottom part of the injected code, along with the 32-bit and 64-bit versions. To initiate this component, the malware suspends the process svchost.exe and injects it with the Tor component’s code then resumes the process. In doing so, the execution of Tor is masked. It is launched using the following parameters:

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