Name:Windows Service Create RemComSvc id:0be4b5d6-c449-4084-b945-2392b519c33b version:3 date:2024-09-30 author:Michael Haag, Splunk status:production type:Anomaly Description:The following analytic detects the creation of the RemComSvc service on a Windows endpoint, typically indicating lateral movement using RemCom.exe. It leverages Windows EventCode 7045 from the System event log, specifically looking for the "RemCom Service" name. This activity is significant as it often signifies unauthorized lateral movement within the network, which is a common tactic used by attackers to spread malware or gain further access. If confirmed malicious, this could lead to unauthorized access to sensitive systems, data exfiltration, or further compromise of the network. Data_source:
-Windows Event Log System 7045
search:`wineventlog_system` EventCode=7045 ServiceName="RemCom Service" | stats count min(_time) as firstTime max(_time) as lastTime by dest ImagePath ServiceName ServiceType | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_service_create_remcomsvc_filter`
how_to_implement:To implement this analytic, the Windows EventCode 7045 will need to be logged. The Windows TA for Splunk is also recommended. known_false_positives:False positives may be present, filter as needed based on administrative activity. References: -https://www.crowdstrike.com/blog/bears-midst-intrusion-democratic-national-committee/ -https://github.com/kavika13/RemCom 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: - 'Active Directory Discovery' asset_type:Endpoint confidence:80 impact:40 message:A new service was created related to RemCom on $dest$. mitre_attack_id: - 'T1543.003' - 'T1543' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'dest' - 'EventCode' - 'ImagePath' - 'ServiceName' - 'ServiceType' risk_score:32 security_domain:endpoint
