name: Vbscript Execution Using Wscript App
id: 35159940-228f-11ec-8a49-acde48001122
version: 1
date: '2021-10-01'
author: Teoderick Contreras, Splunk
status: production
type: TTP
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.
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
  = "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: The detection is based on data that originates from Endpoint Detection
  and Response (EDR) agents. These agents are designed to provide security-related
  telemetry from the endpoints where the agent is installed. To implement this search,
  you must ingest logs that contain the process GUID, process name, and parent process.
  Additionally, you must ingest complete command-line executions. These logs must
  be processed using the appropriate Splunk Technology Add-ons that are specific to
  the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
  data model. Use the Splunk Common Information Model (CIM) to normalize the field
  names and speed up the data modeling process.
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
  asset_type: Endpoint
  confidence: 70
  impact: 70
  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
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.005/vbs_wscript/sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog