066. Detecting Bore - Another Tunneling Tool in Adversary's Kit

Hello everyone! Tunneling tools - they are everywhere! Today we'll look at another example observed in-the-wild - Bore. 


It's a CLI tool that exposes local ports to a remote server. Want an example? Sure, here you go:

"%TEMP%\svhos.exe" local 3389 --to 91.202.233[.]238

Third-rate masquarading, right? I think you noticed interesting command line parameters we can use for building detections. Here's an example:

event_type: "processcreate" 

AND 

cmdline.keyword: /.* local .*/ 

AND 

cmdline: (("3389" OR "22") AND "to")

Of course, you can experiment with port numbers and exclusions!

See you tomorrow!

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