HackTool - SysmonEnte Execution — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-09-07 / 2023-11-28.

{
  "category": "process_access",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b04a46de56fd6c9660dc508547b695006576906b0e207000e3c28d027bf88667

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: HackTool - SysmonEnte Execution
id: d29ada0f-af45-4f27-8f32-f7b77c3dbc4e
status: test
description: Detects the use of SysmonEnte, a tool to attack the integrity of Sysmon
references:
    - https://codewhitesec.blogspot.com/2022/09/attacks-on-sysmon-revisited-sysmonente.html
    - https://github.com/codewhitesec/SysmonEnte/
    - https://github.com/codewhitesec/SysmonEnte/blob/fe267690fcc799fbda15398243615a30451d9099/screens/1.png
author: Florian Roth (Nextron Systems)
date: 2022-09-07
modified: 2023-11-28
tags:
    - attack.defense-impairment
    - attack.t1685.001
logsource:
    category: process_access
    product: windows
detection:
    selection_sysmon:
        TargetImage|contains:
            - ':\Windows\Sysmon.exe'
            - ':\Windows\Sysmon64.exe'
        GrantedAccess: '0x1400'
    selection_calltrace:
        CallTrace: 'Ente'
    filter_main_generic:
        SourceImage|contains:
            - ':\Program Files (x86)\'
            - ':\Program Files\'
            - ':\Windows\System32\'
            - ':\Windows\SysWOW64\'
    filter_main_msdefender:
        SourceImage|contains: ':\ProgramData\Microsoft\Windows Defender\Platform\'
        SourceImage|endswith: '\MsMpEng.exe'
    condition: ( selection_sysmon and not 1 of filter_main_* ) or selection_calltrace
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://codewhitesec.blogspot.com/2022/09/attacks-on-sysmon-revisited-sysmonente.html
• https://github.com/codewhitesec/SysmonEnte/
• https://github.com/codewhitesec/SysmonEnte/blob/fe267690fcc799fbda15398243615a30451d9099/screens/1.png