name: Linux Data Destruction Command
id: b11d3979-b2f7-411b-bb1a-bd00e642173b
version: 1
date: '2023-04-14'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: The following analytic identifies a unix shell command that can wipe
  root folders of a linux host. This commandline is being abused by Awfulshred malware
  that wipes or corrupts files in a targeted Linux host. The shell command uses the
  rm command with force recursive deletion even in the root folder. This TTP can be
  a good indicator that a user or a process wants to wipe roots directory files in
  Linux 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 = "rm"  AND
  Processes.process IN ("* -rf*", "* -fr*") AND Processes.process = "* --no-preserve-root"
  by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
  Processes.process Processes.process_id Processes.parent_process_id Processes.process_guid
  | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `linux_data_destruction_command_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://cert.gov.ua/article/3718487
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/overview-of-the-cyber-weapons-used-in-the-ukraine-russia-war/
tags:
  analytic_story:
  - AwfulShred
  - Data Destruction
  asset_type: Endpoint
  confidence: 90
  impact: 100
  message: a $process_name$ execute rm command with --no-preserve-root parmeter that
    can wipe root files in $dest$
  mitre_attack_id:
  - T1485
  observable:
  - name: dest
    type: Hostname
    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.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_id
  risk_score: 90
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/awfulshred/test1/sysmon_linux.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon_linux
    update_timestamp: true