Bitbucket User Login Failure — 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: 14c806f080291d3a7c4c108da2ee8baaf15aa6a6bf47b71ab76b5f44a7829081

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 User Login Failure
id: 70ed1d26-0050-4b38-a599-92c53d57d45a
status: test
description: |
    Detects user authentication failure events.
    Please note that this rule can be noisy and it is recommended to use with correlation based on "author.name" field.
references:
    - https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html
author: Muhammad Faisal (@faisalusuf)
date: 2024-02-25
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.credential-access
    - attack.stealth
    - attack.t1078.004
    - attack.t1110
logsource:
    product: bitbucket
    service: audit
    definition: 'Requirements: "Advance" log level is required to receive these audit events.'
detection:
    selection:
        auditType.category: 'Authentication'
        auditType.action: 'User login failed'
    condition: selection
falsepositives:
    - Legitimate user wrong password attempts.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate user wrong password attempts.

Source references

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