name: Detect RClone Command-Line Usage
id: 32e0baea-b3f1-11eb-a2ce-acde48001122
version: 2
date: '2021-11-29'
author: Michael Haag, Splunk
status: production
type: TTP
description: This analytic identifies commonly used command-line arguments used by
  `rclone.exe` to initiate a file transfer. Some arguments were negated as they are
  specific to the configuration used by adversaries. In particular, an adversary may
  list the files or directories of the remote file share using `ls` or `lsd`, which
  is not indicative of malicious behavior. During triage, at this stage of a ransomware
  event, exfiltration is about to occur or has already. Isolate the endpoint and continue
  investigating by review file modifications and parallel processes.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    Image|endswith: rclone.exe
  selection2:
    OriginalFileName: rclone.exe
  selection3:
    CommandLine:
    - '*copy*'
    - '*mega*'
    - '*pcloud*'
    - '*ftp*'
    - '*--config*'
    - '*--progress*'
    - '*--no-check-certificate*'
    - '*--ignore-existing*'
    - '*--auto-confirm*'
    - '*--transfers*'
    - '*--multi-thread-streams*'
  condition: (selection1 or selection2) and selection3
how_to_implement: To successfully implement this search you need to be ingesting information
  on process that include the name of the process responsible for the changes from
  your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
  confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
  endpoint product.
known_false_positives: False positives should be limited as this is restricted to
  the Rclone process name. Filter or tune the analytic as needed.
references:
- https://redcanary.com/blog/rclone-mega-extortion/
- https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
- https://thedfirreport.com/2021/11/29/continuing-the-bazar-ransomware-story/
tags:
  analytic_story:
  - DarkSide Ransomware
  - Ransomware
  asset_type: Endpoint
  confidence: 70
  impact: 50
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting to connect to a remote cloud service
    to move files or folders.
  mitre_attack_id:
  - T1020
  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: 35
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1020/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog