Name:Windows Excessive Disabled Services Event id:c3f85976-94a5-11ec-9a58-acde48001122 version:6 date:2024-11-28 author:Teoderick Contreras, Splunk status:production type:TTP Description:The following analytic identifies an excessive number of system events where services are modified from start to disabled. It leverages Windows Event Logs (EventCode 7040) to detect multiple service state changes on a single host. This activity is significant as it may indicate an adversary attempting to disable security applications or other critical services, potentially leading to defense evasion or destructive actions. If confirmed malicious, this behavior could allow attackers to disable security defenses, disrupt system operations, and achieve their objectives on the compromised system. Data_source:
-Windows Event Log System 7040
search:`wineventlog_system` EventCode=7040 "disabled" | stats count values(EventData_Xml) as MessageList dc(EventData_Xml) as MessageCount min(_time) as firstTime max(_time) as lastTime by Computer EventCode UserID | rename Computer as dest | where count >=10 | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_excessive_disabled_services_event_filter`
how_to_implement:To successfully implement this search, you need to be ingesting logs with the Service name, Service File Name Service Start type, and Service Type from your endpoints. known_false_positives:Unknown References: -https://blog.talosintelligence.com/2018/02/olympic-destroyer.html drilldown_searches: name:'View the detection results for - "$dest$"' search:'%original_detection_search% | search dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") 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: - 'CISA AA23-347A' - 'Compromised Windows Host' - 'Windows Defense Evasion Tactics' asset_type:Endpoint confidence:90 impact:90 message:An excessive number (Count - $MessageCount$) of Windows services were disabled on dest - $dest$. mitre_attack_id: - 'T1562.001' - 'T1562' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'src' - 'ComputerName' - 'EventCode' - 'Message' - 'User' - 'Sid' risk_score:81 security_domain:endpoint
