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Detection rules › Sigma

Bitbucket Unauthorized Access To A Resource

Status
test
Severity
critical
Log source
product bitbucket, service audit
Author
Muhammad Faisal (@faisalusuf)
Source
github.com/SigmaHQ/sigma

Detects unauthorized access attempts to a resource.

MITRE ATT&CK coverage

TacticTechniques
Resource DevelopmentT1586 Compromise Accounts

Rule body yaml

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    - Access attempts to non-existent repositories or due to outdated plugins.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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    auditType.category: 'Security'
    auditType.action: 'Unauthorized access to a resource'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
auditType.actioneq
  • Unauthorized access to a resource
auditType.categoryeq
  • Security