OpenSSH Server Listening On Socket — Sigma Rule

Rule metadata and linked tags

Author: mdecrevoisier. Source status: test; severity: medium. Source dates: 2022-10-25 / not supplied.

{
  "product": "windows",
  "service": "openssh"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 70abe96cf203bc4ed26952ffb05d5044fdf10eb3b6a6415d227964a85d0dd697

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: OpenSSH Server Listening On Socket
id: 3ce8e9a4-bc61-4c9b-8e69-d7e2492a8781
status: test
description: Detects scenarios where an attacker enables the OpenSSH server and server starts to listening on SSH socket.
references:
    - https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0008-Lateral%20Movement/T1021.004-Remote%20Service%20SSH
    - https://winaero.com/enable-openssh-server-windows-10/
    - https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse
    - https://virtualizationreview.com/articles/2020/05/21/ssh-server-on-windows-10.aspx
    - https://medium.com/threatpunter/detecting-adversary-tradecraft-with-image-load-event-logging-and-eql-8de93338c16
author: mdecrevoisier
date: 2022-10-25
tags:
    - attack.lateral-movement
    - attack.t1021.004
logsource:
    product: windows
    service: openssh
detection:
    selection:
        EventID: 4
        process: sshd
        payload|startswith: 'Server listening on '
    condition: selection
falsepositives:
    - Legitimate administrator activity
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate administrator activity

Source references

• https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0008-Lateral%20Movement/T1021.004-Remote%20Service%20SSH
• https://winaero.com/enable-openssh-server-windows-10/
• https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse
• https://virtualizationreview.com/articles/2020/05/21/ssh-server-on-windows-10.aspx
• https://medium.com/threatpunter/detecting-adversary-tradecraft-with-image-load-event-logging-and-eql-8de93338c16