sigmamediumHunting

Potentially Suspicious Execution Of Regasm/Regsvcs With Uncommon Extension

Detects potentially suspicious execution of the Regasm/Regsvcs utilities with an uncommon extension.

MITRE ATT&CK

defense-evasion

Detection Query

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_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-02-13

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1218.009

Raw Content

title: Potentially Suspicious Execution Of Regasm/Regsvcs With Uncommon Extension
id: e9f8f8cc-07cc-4e81-b724-f387db9175e4
related:
    - id: cc368ed0-2411-45dc-a222-510ace303cb2
      type: derived
status: test
description: Detects potentially suspicious execution of the Regasm/Regsvcs utilities with an uncommon extension.
references:
    - 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: Nasreddine Bencherchali (Nextron Systems)
date: 2023-02-13
tags:
    - attack.defense-evasion
    - 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:
            # Note: Add more potentially uncommon extensions
            - '.dat'
            - '.gif'
            - '.jpeg'
            - '.jpg'
            - '.png'
            - '.txt'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium