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chore(rules): Improve Unsigned DLL injection via remote thread rule #466

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rabbitstack merged 1 commit into from
Apr 11, 2025
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chore(rules): Improve Unsigned DLL injection via remote thread rule #466

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8 changes: 4 additions & 4 deletions rules/defense_evasion_unsigned_dll_injection_via_remote_thread.yml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
name: Unsigned DLL injection via remote thread
id: 21bdd944-3bda-464b-9a72-58fd37ba9163
version: 1.0.2
version: 1.1.0
description: |
Identifies unsigned DLL injection via remote thread creation.
Adversaries may inject dynamic-link libraries (DLLs) into processes in order to evade process-based defenses
Expand All @@ -22,15 +22,15 @@ references:
condition: >
sequence
maxspan 1m
|create_remote_thread and not (ps.exe imatches
|create_remote_thread and thread.start_address.symbol imatches ('LoadLibrary*', 'LdrLoadDLL*') and not (ps.exe imatches
(
'?:\\Program Files\\*.exe',
'?:\\Program Files (x86)\\*.exe'
)
or
(ps.exe imatches 'C:\\Windows\\System32\\svchost.exe' and ps.args intersects ('-k', 'DcomLaunch'))
(ps.exe imatches '?:\\Windows\\System32\\svchost.exe' and ps.args intersects ('-k', 'DcomLaunch'))
or
(ps.cmdline imatches '?:\\Windows\\Microsoft.NET\\Framework\\*\\ngen.exe ExecuteQueuedItems /LegacyServiceBehavior')
(ps.cmdline imatches '"?:\\Windows\\Microsoft.NET\\Framework\\*\\ngen.exe" ExecuteQueuedItems /LegacyServiceBehavior')
)
| by thread.pid
|(load_unsigned_or_untrusted_dll)
Expand Down