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sigma-rules/rules/windows
Hilton 0bc9b126f6 Tunes Unusual Parent Process for cmd.exe rule to exclude oobe activity (#3091)
* Tunes Unusual Parent Process for cmd.exe rule to exclude oobe activity

When dllhost.exe is called with the "/Processid:{CA8C87C1-929D-45BA-94DB-EF8E6CB346AD}" argument it is creating an "OOBE Elevated Object Server"  as per https://strontic.github.io/xcyclopedia/library/clsid_ca8c87c1-929d-45ba-94db-ef8e6cb346ad.html

Out of the box experience is part of the Windows autopilot and therefore should be legitimate behaviour.

* simplified detection logic by utilising process.parent.args

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Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>

(cherry picked from commit ccfc931fbd)
2023-09-13 16:56:38 +00:00
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