Name:GitHub Actions Disable Security Workflow id:0459f1a5-c0ac-4987-82d6-65081209f854 version:3 date:2024-09-30 author:Patrick Bareiss, Splunk status:production type:Anomaly Description:The following analytic detects the disabling of a security workflow in GitHub Actions. It leverages GitHub logs to identify when a workflow, excluding those named *security-testing*, is disabled following a push or pull request event. This activity is significant as it may indicate an attempt by an attacker to conceal malicious code by disabling security checks. If confirmed malicious, this could allow the attacker to introduce and persist undetected malicious code within the repository, potentially compromising the integrity and security of the codebase. Data_source:
-GitHub
search:`github` workflow_run.event=push OR workflow_run.event=pull_request | stats values(workflow_run.name) as workflow_run.name by workflow_run.head_commit.id workflow_run.event workflow_run.head_branch workflow_run.head_commit.author.email workflow_run.head_commit.author.name workflow_run.head_commit.message workflow_run.head_commit.timestamp workflow_run.head_repository.full_name workflow_run.head_repository.owner.id workflow_run.head_repository.owner.login workflow_run.head_repository.owner.type | rename workflow_run.head_commit.author.name as user, workflow_run.head_commit.author.email as user_email, workflow_run.head_repository.full_name as repository, workflow_run.head_branch as branch | search NOT workflow_run.name=*security-testing* | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `github_actions_disable_security_workflow_filter`
how_to_implement:You must index GitHub logs. You can follow the url in reference to onboard GitHub logs. Sometimes GitHub logs are truncated, make sure to disable it in props.conf. Replace *security-testing* with the name of your security testing workflow in GitHub Actions. known_false_positives:unknown References: -https://www.splunk.com/en_us/blog/tips-and-tricks/getting-github-data-with-webhooks.html drilldown_searches: name:'View the detection results for - "$repository$"' search:'%original_detection_search% | search repository = "$repository$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$repository$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$repository$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Dev Sec Ops' asset_type:GitHub confidence:90 impact:30 message:Security Workflow is disabled in branch $branch$ for repository $repository$ mitre_attack_id: - 'T1195.002' - 'T1195' observable: name:'repository' type:'Other' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - 'workflow_run.event' - 'workflow_run.name' - 'workflow_run.head_commit.id' - 'workflow_run.event workflow_run.head_branch' - 'workflow_run.head_commit.author.email' - 'workflow_run.head_commit.author.name' - 'workflow_run.head_commit.message' - 'workflow_run.head_commit.timestamp' - 'workflow_run.head_repository.full_name' - 'workflow_run.head_repository.owner.id' - 'workflow_run.head_repository.owner.login' - 'workflow_run.head_repository.owner.type' risk_score:27 security_domain:network
