299. That's How Adversaries Abuse the BCP Utility

Hello everyone!

Today we'll look at a curious example of Deobfuscate/Decode Files or Information (T1140), and learn how ransomware affiliates abuse Bulk Copy Program (BCP).

The example is Trigona ransomware gang, which also uses Mimic ransomware in their campaigns. So, the adversary often targets MS-SQL Server instances and leverages bcp.exe to export the toolset to the compromised server, for example:

bcp “select binaryTable from uGnzBdZbsi” queryout “C:\ProgramData\spd.exe” -T -f “C:\ProgramData\FODsOZKgAU.txt”

bcp “select binaryTable from uGnzBdZbsi” queryout “C:\ProgramData\AD.exe” -T -f “C:\ProgramData\FODsOZKgAU.txt”

bcp “select binaryTable from uGnzBdZbsi” queryout “C:\users\[username]\music\L.bat” -T -f “C:\users\[username]\music\FODsOZKgAU.txt”

bcp “select binaryTable from uGnzBdZbsi” queryout “C:\users\[username]\music\pci2.exe” -T -f “C:\users\[users name]\music\FODsOZKgAU.txt”

For example, we can hunt for bcp.exe exporting files to suspicious folders:

event_type: "processcreatewin"

AND

proc_file_path: "bcp.exe"

AND

cmdline: ("queryout" AND ("programdata" OR "public" OR "music" OR "videos" OR "documents"))

See you tomorrow!

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