Lsass Memory Dump via Comsvcs DLL

calendar Dec 4, 2023 · attack.credential_access attack.t1003.001  ·
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Detects adversaries leveraging the MiniDump export function from comsvcs.dll via rundll32 to perform a memory dump from lsass.

Sigma rule (View on GitHub)

 1title: Lsass Memory Dump via Comsvcs DLL
 2id: a49fa4d5-11db-418c-8473-1e014a8dd462
 3status: test
 4description: Detects adversaries leveraging the MiniDump export function from comsvcs.dll via rundll32 to perform a memory dump from lsass.
 5references:
 6    - https://twitter.com/shantanukhande/status/1229348874298388484
 7    - https://modexp.wordpress.com/2019/08/30/minidumpwritedump-via-com-services-dll/
 8author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
 9date: 2020/10/20
10modified: 2023/11/29
11tags:
12    - attack.credential_access
13    - attack.t1003.001
14logsource:
15    category: process_access
16    product: windows
17detection:
18    selection:
19        TargetImage|endswith: '\lsass.exe'
20        SourceImage|endswith: '\rundll32.exe'
21        CallTrace|contains: 'comsvcs.dll'
22    condition: selection
23falsepositives:
24    - Unknown
25level: high

References

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