permission_modification_using_takeown_app.yml

name: Permission Modification using Takeown App
id: fa7ca5c6-c9d8-11eb-bce9-acde48001122
version: 1
date: '2021-06-10'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This search is to detect a modification of file or directory permission
  using takeown.exe windows app. This technique was seen in some ransomware that take
  the ownership of a folder or files to encrypt or delete it.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "takeown.exe"
  Processes.process = "*/f*" by Processes.parent_process_name Processes.parent_process
  Processes.process_name Processes.process Processes.dest Processes.user Processes.process_id
  Processes.process_guid | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `permission_modification_using_takeown_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: takeown.exe is a normal windows application that may used by
  network operator.
references:
- https://research.nccgroup.com/2020/06/23/wastedlocker-a-new-ransomware-variant-developed-by-the-evil-corp-group/
tags:
  analytic_story:
  - Ransomware
  - Sandworm Tools
  asset_type: Endpoint
  confidence: 80
  impact: 70
  message: A suspicious of execution of $process_name$ with process id $process_id$
    and commandline $process$ to modify permission of directory or files in host $dest$
  mitre_attack_id:
  - T1222
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: process_name
    type: Process
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.process_name
  - Processes.process
  - Processes.dest
  - Processes.user
  - Processes.process_id
  - Processes.process_guid
  risk_score: 56
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data1/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog