Potentially Suspicious Execution Of Regasm/Regsvcs With Unusual Extension (via process_creation)

title: Potentially Suspicious Execution Of Regasm/Regsvcs With Unusual Extension (via process_creation)
id: 8f50ff66-293e-5d24-b5c8-b47c5b44c8dc
status: stable
description: This rule detects potentially anomalous execution of the Regasm/Regsvcs utilities with an uncommon extension.
references:
    - https://attack.mitre.org/techniques/T1218/009/
    - https://www.fortiguard.com/threat-signal-report/4718?s=09
    - https://lolbas-project.github.io/lolbas/Binaries/Regasm/
    - https://lolbas-project.github.io/lolbas/Binaries/Regsvcs/
author: Huntrule Team
date: 2026-01-25
tags:
    - attack.stealth
    - attack.t1218.009
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\Regsvcs.exe'
              - '\Regasm.exe'
        - OriginalFileName:
              - 'RegSvcs.exe'
              - 'RegAsm.exe'
    selection_extension:
        CommandLine|contains:
            - '.dat'
            - '.gif'
            - '.jpeg'
            - '.jpg'
            - '.png'
            - '.txt'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium