name: CHCP Command Execution
id: 21d236ec-eec1-11eb-b23e-acde48001122
version: 1
date: '2021-07-27'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This search is to detect execution of chcp.exe application. this utility
  is used to change the active code page of the console. This technique was seen in
  icedid malware to know the locale region/language/country of the compromise host.
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.process_name=chcp.com
  Processes.parent_process_name = cmd.exe (Processes.parent_process=*/c* OR Processes.parent_process=*/k*)
  by  Processes.process_name Processes.process Processes.parent_process_name Processes.parent_process
  Processes.process_id Processes.parent_process_id Processes.dest Processes.user |
  `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `chcp_command_execution_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: other tools or script may used this to change code page to
  UTF-* or others
references:
- https://ss64.com/nt/chcp.html
- https://twitter.com/tccontre18/status/1419941156633329665?s=20
tags:
  analytic_story:
  - IcedID
  - Azorult
  - Forest Blizzard
  asset_type: Endpoint
  confidence: 30
  impact: 30
  message: parent process $parent_process_name$ spawning chcp process $process_name$
    with parent command line $parent_process$
  mitre_attack_id:
  - T1059
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: user
    type: User
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - process_name
  - process
  - parent_process_name
  - parent_process
  - process_id
  - parent_process_id
  - dest
  - user
  risk_score: 9
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/simulated_icedid/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog