234. That's How MountBot Hides Its Processes

Hello everyone!

Adversaries always want to hide their malicious activities. Some hiding techniques are common, while others are not. Let's look at one of them - Hide Artifacts: Bind Mounts (T1564.013).

According to this report, MountBot has the following code:

mount('/proc/1', '/proc/self', 0, MS_BIND, 0);

And this is an example how adversaries abuse bind mounts on file structures to hide their activity!

Of course, we can hunt for suspicious executions of mount:

event_type: "processcreatenix"

AND

proc_file_path: "mount"

AND

cmdline: ("bind" AND "proc")

See you tomorrow!

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