167. Adversaries Use Weaponized GitHub Repositories to Deliver Malware

Hello everyone!

Trend Micro has uncovered a new threat actor dubbed Water Curse. The adversary uses weaponized GitHub repositories to deliver multistage malware. Researchers already identified at least 76 GitHub accounts related to this campaign.

So, the project files contain a snippet of malicious batch file code inside of the <PreBuildEvent> tag, which would be triggered while the code is compiling. MSBuild.exe spawns cmd.exe, which drops a malicious .vbs file, for example, C:\Users\[redacted]\AppData\Local\Temp\ohQ13W\XHa0aaUw9.vbs.

And yes, we can use this behavior for hunting:

event_type: "filecreatewin"

AND

proc_p_file_path: "msbuild.exe"

AND

proc_file_path: "cmd.exe"

AND

file_path: "vbs"

See you tomorrow!

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