Bitbucket Global SSH Settings Changed — Sigma Rule

Rule metadata and linked tags

Author: Muhammad Faisal (@faisalusuf). Source status: test; severity: medium. Source dates: 2024-02-25 / not supplied.

{
  "product": "bitbucket",
  "service": "audit",
  "definition": "Requirements: \"Advance\" log level is required to receive these audit events."
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d15f178f92db103c7f1432be405b5632e5788fdd82d33a0fa58a14833bcd03da

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: Bitbucket Global SSH Settings Changed
id: 16ab6143-510a-44e2-a615-bdb80b8317fc
status: test
description: Detects Bitbucket global SSH access configuration changes.
references:
    - https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html
    - https://confluence.atlassian.com/bitbucketserver/enable-ssh-access-to-git-repositories-776640358.html
author: Muhammad Faisal (@faisalusuf)
date: 2024-02-25
tags:
    - attack.lateral-movement
    - attack.defense-impairment
    - attack.t1685
    - attack.t1021.004
logsource:
    product: bitbucket
    service: audit
    definition: 'Requirements: "Advance" log level is required to receive these audit events.'
detection:
    selection:
        auditType.category: 'Global administration'
        auditType.action: 'SSH settings changed'
    condition: selection
falsepositives:
    - Legitimate user activity.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate user activity.

Source references

• https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html
• https://confluence.atlassian.com/bitbucketserver/enable-ssh-access-to-git-repositories-776640358.html