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
- https://malpedia.caad.fkie.fraunhofer.de/details/win.asyncrat
tags:
  analytic_story:
  - FIN7
  - Remcos
  - AsyncRAT
  confidence: 70
  context:
  - Source:Endpoint
  - Stage:Execution
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.005/vbs_wscript/sysmon.log
  impact: 70
  kill_chain_phases:
  - Exploitation
  message: Process name $process_name$ with commandline $process$ to execute vbsscript
  mitre_attack_id:
  - T1059.005
  - T1059
  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.dest
  - Processes.user
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.original_file_name
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_path
  - Processes.process_path
  - Processes.parent_process_id
  risk_score: 49
  security_domain: endpoint
  supported_tas:
  - Splunk_TA_microsoft_sysmon
  asset_type: Endpoint