PUA - Rclone Execution — Sigma Rule

Rule metadata and linked tags

Author: Bhabesh Raj, Sittikorn S, Aaron Greetham (@beardofbinary) - NCC Group. Source status: test; severity: high. Source dates: 2021-05-10 / 2023-03-05.

{
  "product": "windows",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 23109549e2a00d4e0ac3c0389d5fdc998ae3d7aa65832c38c8e4ad811919c418

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: PUA - Rclone Execution
id: e37db05d-d1f9-49c8-b464-cee1a4b11638
related:
    - id: a0d63692-a531-4912-ad39-4393325b2a9c
      type: obsolete
    - id: cb7286ba-f207-44ab-b9e6-760d82b84253
      type: obsolete
status: test
description: Detects execution of RClone utility for exfiltration as used by various ransomwares strains like REvil, Conti, FiveHands, etc
references:
    - https://research.nccgroup.com/2021/05/27/detecting-rclone-an-effective-tool-for-exfiltration/
    - https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware
    - https://us-cert.cisa.gov/ncas/analysis-reports/ar21-126a
    - https://labs.sentinelone.com/egregor-raas-continues-the-chaos-with-cobalt-strike-and-rclone
    - https://www.splunk.com/en_us/blog/security/darkside-ransomware-splunk-threat-update-and-detections.html
author: Bhabesh Raj, Sittikorn S, Aaron Greetham (@beardofbinary) - NCC Group
date: 2021-05-10
modified: 2023-03-05
tags:
    - attack.exfiltration
    - attack.t1567.002
logsource:
    product: windows
    category: process_creation
detection:
    selection_specific_options:
        CommandLine|contains|all:
            - '--config '
            - '--no-check-certificate '
            - ' copy '
    selection_rclone_img:
        - Image|endswith: '\rclone.exe'
        - Description: 'Rsync for cloud storage'
    selection_rclone_cli:
        CommandLine|contains:
            - 'pass'
            - 'user'
            - 'copy'
            - 'sync'
            - 'config'
            - 'lsd'
            - 'remote'
            - 'ls'
            - 'mega'
            - 'pcloud'
            - 'ftp'
            - 'ignore-existing'
            - 'auto-confirm'
            - 'transfers'
            - 'multi-thread-streams'
            - 'no-check-certificate '
    condition: selection_specific_options or all of selection_rclone_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://research.nccgroup.com/2021/05/27/detecting-rclone-an-effective-tool-for-exfiltration/
• https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware
• https://us-cert.cisa.gov/ncas/analysis-reports/ar21-126a
• https://labs.sentinelone.com/egregor-raas-continues-the-chaos-with-cobalt-strike-and-rclone
• https://www.splunk.com/en_us/blog/security/darkside-ransomware-splunk-threat-update-and-detections.html