sigmamediumHunting

DllUnregisterServer Function Call Via Msiexec.EXE

Detects MsiExec loading a DLL and calling its DllUnregisterServer function

MITRE ATT&CK

defense-evasion

Detection Query

selection_img:
  - Image|endswith: \msiexec.exe
  - OriginalFileName: \msiexec.exe
selection_flag:
  CommandLine|contains|windash: " -z "
selection_dll:
  CommandLine|contains: .dll
condition: all of selection_*

Author

frack113

Created

2022-04-24

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1218.007

Raw Content

title: DllUnregisterServer Function Call Via Msiexec.EXE
id: 84f52741-8834-4a8c-a413-2eb2269aa6c8
status: test
description: Detects MsiExec loading a DLL and calling its DllUnregisterServer function
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218.007/T1218.007.md
    - https://lolbas-project.github.io/lolbas/Binaries/Msiexec/
    - https://twitter.com/_st0pp3r_/status/1583914515996897281
author: frack113
date: 2022-04-24
modified: 2024-03-13
tags:
    - attack.defense-evasion
    - attack.t1218.007
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\msiexec.exe'
        - OriginalFileName: '\msiexec.exe'
    selection_flag:
        CommandLine|contains|windash: ' -z '
    selection_dll:
        CommandLine|contains: '.dll'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium