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49 lines
2.0 KiB
YAML
49 lines
2.0 KiB
YAML
name: Execute Javascript With Jscript COM CLSID
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id: dc64d064-d346-11eb-8588-acde48001122
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version: 1
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date: '2021-06-22'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This analytic will identify suspicious process of cscript.exe where it
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tries to execute javascript using jscript.encode CLSID (COM OBJ). This technique
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was seen in ransomware (reddot ransomware) where it execute javascript with this
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com object with combination of amsi disabling technique.
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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.process_name = "cscript.exe"
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Processes.process="*-e:{F414C262-6AC0-11CF-B6D1-00AA00BBBB58}*" by Processes.parent_process_name
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Processes.process_name Processes.process Processes.parent_process Processes.process_id
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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)` | `execute_javascript_with_jscript_com_clsid_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the Filesystem responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Filesystem` node.
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known_false_positives: unknown
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references:
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- https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/
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tags:
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analytic_story:
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- Ransomware
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1059.005
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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.process_name
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- Processes.process
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- Processes.parent_process
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- Processes.process_id
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- Processes.dest
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- Processes.user
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security_domain: endpoint
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data2/windows-sysmon.log
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