name: Execute Javascript With Jscript COM CLSID
id: dc64d064-d346-11eb-8588-acde48001122
version: 1
date: '2021-06-22'
author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: This analytic will identify suspicious process of cscript.exe where it
  tries to execute javascript using jscript.encode CLSID (COM OBJ). This technique
  was seen in ransomware (reddot ransomware) where it execute javascript with this
  com object with combination of amsi disabling technique.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "cscript.exe"
  Processes.process="*-e:{F414C262-6AC0-11CF-B6D1-00AA00BBBB58}*" by Processes.parent_process_name
  Processes.process_name Processes.process Processes.parent_process Processes.process_id
  Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `execute_javascript_with_jscript_com_clsid_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information
  on process that include the name of the Filesystem responsible for the changes from
  your endpoints into the `Endpoint` datamodel in the `Filesystem` node.
known_false_positives: unknown
references:
- https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/
tags:
  analytic_story:
  - Ransomware
  confidence: 70
  context:
  - Source:Endpoint
  - Stage:Execution
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data2/windows-sysmon.log
  impact: 80
  kill_chain_phases:
  - Exploitation
  message: Suspicious process of cscript.exe with a parent process $parent_process_name$
    where it tries to execute javascript using jscript.encode CLSID (COM OBJ), detected
    on $dest$ by $user$
  mitre_attack_id:
  - T1059
  - T1059.005
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Endpoint
    role:
    - Victim
  - name: process_id
    type: Process
    role:
    - Attacker
  - name: parent_process_name
    type: Process Name
    role:
    - Parent Process
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.parent_process_name
  - Processes.process_name
  - Processes.process
  - Processes.parent_process
  - Processes.process_id
  - Processes.dest
  - Processes.user
  risk_score: 56
  security_domain: endpoint
  supported_tas:
  - Splunk_TA_microsoft_sysmon
  asset_type: Endpoint