name: Jscript Execution Using Cscript App
id: 002f1e24-146e-11ec-a470-acde48001122
version: 1
date: '2021-09-13'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This search is to detect a execution of jscript using cscript process.
  Commonly when a user run jscript file it was executed by wscript.exe application.
  This technique was seen in FIN7 js implant to execute its malicious script using
  cscript process. This behavior is uncommon and a good artifacts to check further
  anomalies within the network
data_source:
- Sysmon Event ID 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" AND Processes.parent_process = "*//e:jscript*") OR (Processes.process_name
  = "cscript.exe" AND Processes.process = "*//e:jscript*") by Processes.parent_process_name
  Processes.parent_process Processes.process_name Processes.process_id Processes.process
  Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `jscript_execution_using_cscript_app_filter`'
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
  Sysmon TA.
known_false_positives: unknown
references:
- https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation
- https://attack.mitre.org/groups/G0046/
tags:
  analytic_story:
  - FIN7
  - Remcos
  asset_type: Endpoint
  confidence: 70
  impact: 70
  message: Process name $process_name$ with commandline $process$ to execute jscript
    in $dest$
  mitre_attack_id:
  - T1059
  - T1059.007
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  - name: user
    type: User
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.process_name
  - Processes.process_id
  - Processes.process
  - Processes.dest
  - Processes.user
  risk_score: 49
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/fin7/fin7_macro_js_1/sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog