Name:Jscript Execution Using Cscript App id:002f1e24-146e-11ec-a470-acde48001122 version:15 date:None author:Teoderick Contreras, Splunk status:production type:Anomaly Description:The following analytic detects the execution of JScript using the cscript.exe process.
It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process and command-line telemetry.
This behavior is significant because JScript files are typically executed by wscript.exe, making cscript.exe execution unusual and potentially indicative of malicious activity, such as the FIN7 group's tactics.
If confirmed malicious, this activity could allow attackers to execute arbitrary scripts, leading to code execution, data exfiltration, or further system compromise. Data_source:
-Sysmon EventID 1
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime
FROM datamodel=Endpoint.Processes WHERE ( ( Processes.parent_process_name = "cscript.exe" Processes.parent_process = "*//e:jscript*" ) OR ( Processes.process_name = "cscript.exe" Processes.process = "*//e:jscript*" ) )
NOT Processes.process="*/Job:AgentHIScript*" NOT Processes.parent_process="*/Job:AgentHIScript*"
how_to_implement:The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process. known_false_positives:Symantec Host Integrity check uses Jscript through cscript.exe References: -https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation -https://attack.mitre.org/groups/G0046/ -https://nasbench.medium.com/symantec-endpoint-protection-meets-com-using-symantec-sshelper-as-a-lolbin-40d515a121ce drilldown_searches: name:'View the detection results for - "$dest$" and "$user$"' search:'%original_detection_search% | search dest = "$dest$" user = "$user$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$" and "$user$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$", "$user$") | 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:'7d' latest_offset:'0' analytic_story:['FIN7', 'Remcos']
