name: Conti Common Exec parameter
id: 624919bc-c382-11eb-adcc-acde48001122
version: 1
date: '2021-06-02'
author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: This search detects the suspicious commandline argument of revil ransomware
  to encrypt specific or all local drive and network shares of the compromised machine
  or host.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where Processes.process = "*-m local*"
  OR Processes.process = "*-m net*" OR Processes.process = "*-m all*" OR Processes.process
  = "*-nomutex*" by Processes.process_name Processes.process Processes.parent_process_name
  Processes.parent_process Processes.dest Processes.user Processes.process_id Processes.process_guid
  | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `conti_common_exec_parameter_filter`'
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: 3rd party tool may have commandline parameter that can trigger
  this detection.
references:
- https://malpedia.caad.fkie.fraunhofer.de/details/win.conti
tags:
  analytic_story:
  - Ransomware
  confidence: 80
  context:
  - Source:Endpoint
  - Stage:Execution
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/inf1/windows-sysmon.log
  impact: 80
  kill_chain_phases:
  - Exploitation
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ executing specific Conti Ransomware related
    parameters.
  mitre_attack_id:
  - T1204
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  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: 64
  security_domain: endpoint
  supported_tas:
  - Splunk_TA_microsoft_sysmon
  asset_type: Endpoint