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Description

The following analytic detects the disabling of security jobs in CircleCI pipelines. It leverages CircleCI log data, renaming and extracting fields such as job names, workflow IDs, user information, commit messages, URLs, and branches. The detection identifies mandatory jobs for each workflow and checks if they were executed. This activity is significant because disabling security jobs can allow malicious code to bypass security checks, leading to potential data breaches, system downtime, and reputational damage. If confirmed malicious, this could result in unauthorized code execution and compromised pipeline integrity.

  • Type: Anomaly

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-05-20
  • Author: Patrick Bareiss, Splunk
  • ID: 4a2fdd41-c578-4cd4-9ef7-980e352517f2

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1554 Compromise Host Software Binary Persistence
Kill Chain Phase
  • Installation
NIST
  • DE.AE
CIS20
  • CIS 13
CVE 


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`circleci` 
| rename vcs.committer_name as user vcs.subject as commit_message vcs.url as url workflows.* as *  
| stats values(job_name) as job_names by workflow_id workflow_name user commit_message url branch 
| lookup mandatory_job_for_workflow workflow_name OUTPUTNEW job_name AS mandatory_job 
| search mandatory_job=* 
| eval mandatory_job_executed=if(like(job_names, "%".mandatory_job."%"), 1, 0) 
| where mandatory_job_executed=0 
| eval phase="build" 
| rex field=url "(?<repository>[^\/]*\/[^\/]*)$" 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `circle_ci_disable_security_job_filter`

Macros

The SPL above uses the following Macros:

:information_source: circle_ci_disable_security_job_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Lookups

The SPL above uses the following Lookups:

Required fields

List of fields required to use this analytic.

  • _times

How To Implement

You must index CircleCI logs.

Known False Positives

unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
72.0 80 90 Disable security job $mandatory_job$ in workflow $workflow_name$ from user $user$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2