Suspicious Bitbucket User Login Failure (via audit)

title: Suspicious Bitbucket User Login Failure (via audit)
id: 73109dff-2c03-5f9c-b4c1-2721309a257b
status: stable
description: This rule 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://attack.mitre.org/techniques/T1110/
    - https://attack.mitre.org/techniques/T1078/004/
    - https://confluence.atlassian.com/bitbucketserver/audit-log-events-776640423.html
author: Huntrule Team
date: 2026-07-27
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:
    - Unknown
level: medium