conti_common_exec_parameter.yml

name: Conti Common Exec parameter
id: 624919bc-c382-11eb-adcc-acde48001122
version: 1
date: '2021-06-02'
author: Teoderick Contreras, Splunk
status: production
type: TTP
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.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine:
    - '*-m local*'
    - '*-m net*'
    - '*-m all*'
    - '*-nomutex*'
  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: 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
  asset_type: Endpoint
  confidence: 80
  impact: 80
  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
  risk_score: 64
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/inf1/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog