Explorer Process Tree Break
A Sigma rule for process creation on Windows, by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems), @gott_cyber.
medium 1 ATT&CK technique
What it looks for
detection:
selection_factory:
CommandLine|contains: '/factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b}'
selection_root:
CommandLine|contains: 'explorer.exe'
CommandLine|contains|windash: ' /root,'
condition: 1 of selection_*
The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems), @gott_cyber, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.
Command lines that trip it
The commands LOLBAS or GTFOBins documents for explorer.exe trip it: each is on its program’s page, read by CmdID.
ATT&CK
T1036Masquerading