recursive_delete_of_directory_in_batch_cmd.yml

name: Recursive Delete of Directory In Batch CMD
id: ba570b3a-d356-11eb-8358-acde48001122
version: 3
date: '2022-11-12'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This search is to detect a suspicious commandline designed to delete
  files or directory recursive using batch command. This technique was seen in ransomware
  (reddot) where it it tries to delete the files in recycle bin to impaire user from
  recovering deleted files.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where `process_cmd` Processes.process=*/c*  Processes.process="*
  rd *"  Processes.process="*/s*" Processes.process="*/q*" by Processes.user Processes.process_name
  Processes.parent_process_name Processes.parent_process Processes.process Processes.process_id
  Processes.dest |`drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `recursive_delete_of_directory_in_batch_cmd_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: network operator may use this batch command to delete recursively
  a directory or files within directory
references:
- https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/
tags:
  analytic_story:
  - Ransomware
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: Recursive Delete of Directory In Batch CMD by $user$ on $dest$
  mitre_attack_id:
  - T1070.004
  - T1070
  observable:
  - 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: 25.0
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data2/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog