name: Vbscript Execution Using Wscript App
id: 35159940-228f-11ec-8a49-acde48001122
version: 1
date: '2021-10-01'
author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: This analytic is to detect a suspicious wscript commandline to execute
  vbscript. This technique was seen in several malware to execute malicious vbs file
  using wscript application. commonly vbs script is associated to cscript process
  and this can be a technique to evade process parent child detections or even some
  av script emulation system.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where (Processes.parent_process_name
  = "wscript.exe" AND Processes.parent_process = "*//e:vbscript*") OR (Processes.process_name
  = "wscript.exe" AND Processes.process = "*//e:vbscript*") 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)` | `vbscript_execution_using_wscript_app_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
known_false_positives: unknown
references:
- https://www.joesandbox.com/analysis/369332/0/html
tags:
  analytic_story:
  - FIN7
  - Remcos
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.005/vbs_wscript/sysmon.log
  kill_chain_phases:
  - Exploitation
  mitre_attack_id:
  - T1059.005
  - T1059
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process_name #parent process name
  - Processes.parent_process #parent cmdline
  - Processes.original_file_name
  - Processes.process_name #process name
  - Processes.process #process cmdline
  - Processes.process_id
  - Processes.parent_process_path
  - Processes.process_path
  - Processes.parent_process_id
  security_domain: endpoint
  impact: 70
  confidence: 70
  risk_score: 49
  context:
  - Source:Endpoint
  - Stage:Execution
  message: Process name $process_name$ with commandline $process$ to execute vbsscript
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  - name: user
    type: User
    role:
    - Victim
  automated_detection_testing: passed