355. Hunting for ESXCLI Abuse

Hello everyone!

If we're talking about ransomware gangs, we're always talking about Command and Scripting Interpreter: Hypervisor CLI (T1059.012).

Yes, ransomware gangs love it! Let's look at RansomHouse, and focus on MrAgent. To obtain the MAC address, it runs the following command:

esxcli --formatter=csv network nic list

It runs the following command to collect information on the IP-address:

esxcli --formatter=csv network nic list

It also abuses ESXCLI to disable the firewall:

esxcli network firewall set --enabled false

So, for example, we can hunt for suspicious commands related to managing of host networking:

event_type: "processcreatenix"

AND

cmdline: ("esxcli" AND "network")

See you tomorrow!

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