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Patrick
82 lines
3.3 KiB
YAML
82 lines
3.3 KiB
YAML
name: Jscript Execution Using Cscript App
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id: 002f1e24-146e-11ec-a470-acde48001122
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version: 2
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date: '2024-05-12'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the execution of JScript using the cscript.exe
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process. It leverages data from Endpoint Detection and Response (EDR) agents, focusing
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on process and command-line telemetry. This behavior is significant because JScript
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files are typically executed by wscript.exe, making cscript.exe execution unusual
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and potentially indicative of malicious activity, such as the FIN7 group's tactics.
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If confirmed malicious, this activity could allow attackers to execute arbitrary
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scripts, leading to code execution, data exfiltration, or further system compromise.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where (Processes.parent_process_name
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= "cscript.exe" AND Processes.parent_process = "*//e:jscript*") OR (Processes.process_name
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= "cscript.exe" AND Processes.process = "*//e:jscript*") by Processes.parent_process_name
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Processes.parent_process Processes.process_name Processes.process_id Processes.process
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Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `jscript_execution_using_cscript_app_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: unknown
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references:
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- https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation
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- https://attack.mitre.org/groups/G0046/
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tags:
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analytic_story:
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- FIN7
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- Remcos
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Process name $process_name$ with commandline $process$ to execute jscript
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in $dest$
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mitre_attack_id:
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- T1059
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- T1059.007
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: user
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type: User
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.process_name
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- Processes.process_id
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- Processes.process
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- Processes.dest
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- Processes.user
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risk_score: 49
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/fin7/fin7_macro_js_1/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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