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 Event ID 1
search:
  selection1:
    CommandLine: '*/f*'
    Image|endswith: takeown.exe
  condition: selection1
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
  Sysmon TA.
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
  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
  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