Name:Crowdstrike Medium Identity Risk Severity id:c23b425c-9024-4bd7-b526-c18a4a51d93e version:2 date:2024-09-30 author:Teoderick Contreras, Splunk status:production type:TTP Description:The following analytic detects CrowdStrike alerts for Medium Identity Risk Severity with a risk score of 55 or higher. These alerts indicate significant vulnerabilities in user identities, such as suspicious behavior or compromised credentials. Promptly investigating and addressing these alerts is crucial to prevent potential security breaches and ensure the integrity and protection of sensitive information and systems. Data_source:
search:`crowdstrike_identities` riskScoreSeverity = "MEDIUM" OR riskScore >= 0.55 AND riskScore < 0.70 | rename riskFactors{}.severity as severity, riskFactors{}.type as risk_type, roles{}.type as role_type, accounts{}.domain as domain, accounts{}.dn as dn, accounts{}.samAccountName as user | stats count min(_time) as firstTime max(_time) as lastTime by domain dn primaryDisplayName risk_type severity riskScore riskScoreSeverity user role_type | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `crowdstrike_medium_identity_risk_severity_filter`
how_to_implement:To implement crowdstrike:identities logs, use the Falcon Streaming API. Set up an API client, authenticate with your CrowdStrike credentials, and subscribe to the "crowdstrike:identities" event stream. Process and store the logs as needed, integrating them into your logging or SIEM system for monitoring and analysis. known_false_positives:unknown References: -https://www.crowdstrike.com/wp-content/uploads/2022/12/CrowdStrike-Falcon-Event-Streams-Add-on-Guide-v3.pdf drilldown_searches: name:'View the detection results for - "$user$"' search:'%original_detection_search% | search user = "$user$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$user$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") 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: - 'Compromised Windows Host' asset_type:Endpoint confidence:70 impact:100 message:Medium Identity Risk Score Severity found on $domain$ mitre_attack_id: - 'T1110' observable: name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'riskFactors{}.severity' - 'riskFactors{}.type' - 'roles{}.type' - 'accounts{}.domain' - 'accounts{}.dn' - 'accounts{}.samAccountName' risk_score:70 security_domain:endpoint
