Bitbucket Unauthorized Access To A Resource — Sigma Rule

Rule metadata and linked tags

Author: Muhammad Faisal (@faisalusuf). Source status: test; severity: critical. 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: 2e816d0766963ffe9f72ae84b3b29a25a252555cf68ebd81469e8c1b6d5e6051

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 Unauthorized Access To A Resource
id: 7215374a-de4f-4b33-8ba5-70804c9251d3
status: test
description: Detects unauthorized access attempts to a resource.
references:
    - https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html
author: Muhammad Faisal (@faisalusuf)
date: 2024-02-25
tags:
    - attack.resource-development
    - attack.t1586
logsource:
    product: bitbucket
    service: audit
    definition: 'Requirements: "Advance" log level is required to receive these audit events.'
detection:
    selection:
        auditType.category: 'Security'
        auditType.action: 'Unauthorized access to a resource'
    condition: selection
falsepositives:
    - Access attempts to non-existent repositories or due to outdated plugins. Usually "Anonymous" user is reported in the "author.name" field in most cases.
level: critical

Original YAML and metadata in JSON

False positives

• Access attempts to non-existent repositories or due to outdated plugins. Usually "Anonymous" user is reported in the "author.name" field in most cases.

Source references

• https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html