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fix(rules): Add process exclusions in Potential privilege escalation via phantom DLL hijacking rule #447

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rabbitstack merged 1 commit into from Apr 10, 2025
Merged

fix(rules): Add process exclusions in Potential privilege escalation via phantom DLL hijacking rule #447

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16 changes: 14 additions & 2 deletions rules/privilege_escalation_potential_privilege_escalation_via_phantom_dll_hijacking.yml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name: Potential privilege escalation via phantom DLL hijacking
id: 5ccdb5c2-3a30-4e14-87d2-d7aeb4c45fad
version: 1.0.1
version: 1.0.2
description: |
Identifies the loading of the phantom DLL that was previously dropped
to the System directory. Adversaries may exploit this flow to escalate
Expand All @@ -27,7 +27,7 @@ references:
condition: >
sequence
maxspan 10m
|create_file and file.path imatches
|create_file and kevt.pid != 4 and file.path imatches
(
'?:\\Windows\\System32\\wow64log.dll',
'?:\\Windows\\wbemcomn.dll',
Expand All @@ -44,6 +44,18 @@ condition: >
'?:\\Windows\\System32\\Speech\\Engines\\TTS\\MSTTSLocEnUS.dll',
'?:\\Windows\\System32\\DXGIDebug.dll'
)
and
not
ps.exe imatches
(
'?:\\Windows\\System32\\RuntimeBroker.exe',
'?:\\Windows\\System32\\svchost.exe',
'?:\\Windows\\System32\\services.exe',
'?:\\Windows\\System32\\smss.exe',
'?:\\Windows\\System32\\csrss.exe',
'?:\\Windows\\System32\\wininit.exe',
'?:\\Windows\\System32\\winlogon.exe'
)
| by file.path
|load_dll| by image.path

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