DllUnregisterServer Function Call Via Msiexec.EXE

Detects MsiExec loading a DLL and calling its DllUnregisterServer function

Sigma rule (View on GitHub)

 1title: DllUnregisterServer Function Call Via Msiexec.EXE
 2id: 84f52741-8834-4a8c-a413-2eb2269aa6c8
 3status: test
 4description: Detects MsiExec loading a DLL and calling its DllUnregisterServer function
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218.007/T1218.007.md
 7    - https://lolbas-project.github.io/lolbas/Binaries/Msiexec/
 8    - https://twitter.com/_st0pp3r_/status/1583914515996897281
 9author: frack113
10date: 2022/04/24
11modified: 2023/02/22
12tags:
13    - attack.defense_evasion
14    - attack.t1218.007
15logsource:
16    product: windows
17    category: process_creation
18detection:
19    selection_img:
20        - Image|endswith: '\msiexec.exe'
21        - OriginalFileName: '\msiexec.exe'
22    selection_flag:
23        CommandLine|contains:
24            - ' /z '
25            - ' -z '
26    selection_dll:
27        CommandLine|contains: '.dll'
28    condition: all of selection_*
29falsepositives:
30    - Unknown
31level: medium

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