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pyth0n1c
74 lines
2.6 KiB
YAML
74 lines
2.6 KiB
YAML
author: Teoderick Contreras, Splunk
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datamodel:
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- Endpoint.Processes
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date: '2021-09-13'
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description: This search is to detect a execution of jscript using cscript process.
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Commonly when a user run jscript file it was executed by wscript.exe application.
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This technique was seen in FIN7 js implant to execute its malicious script using
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cscript process. This behavior is uncommon and a good artifacts to check further
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anomalies within the network
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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id: 002f1e24-146e-11ec-a470-acde48001122
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known_false_positives: unknown
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name: Jscript Execution Using Cscript App
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references:
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- https://www.fireeye.com/blog/threat-research/2018/08/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation.html
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- https://attack.mitre.org/groups/G0046/
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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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tags:
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analytic_story:
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- FIN7
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- Remcos
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automated_detection_testing: passed
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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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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impact: 70
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kill_chain_phases:
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- Exploitation
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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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role:
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- Victim
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type: Endpoint
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- name: user
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role:
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- Victim
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type: User
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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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- Endpoint.Processes.dest
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- Endpoint.Processes.parent_process
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- Endpoint.Processes.parent_process_name
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- Endpoint.Processes.process
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- Endpoint.Processes.process_id
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- Endpoint.Processes.process_name
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- Endpoint.Processes.user
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- _time
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risk_score: 49
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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type: TTP
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version: 1
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