DNS Query To MEGA Hosting Website - DNS Client — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-01-16 / not supplied.

{
  "product": "windows",
  "service": "dns-client",
  "definition": "Requirements: Microsoft-Windows-DNS Client Events/Operational Event Log must be enabled/collected in order to receive the events."
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0b285b443c3c775f4a61de1bc790bca96be6db0d1ed7dc09e1cbaa0c93336282

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: DNS Query To MEGA Hosting Website - DNS Client
id: 66474410-b883-415f-9f8d-75345a0a66a6
related:
    - id: 613c03ba-0779-4a53-8a1f-47f914a4ded3
      type: similar
status: test
description: Detects DNS queries for subdomains related to MEGA sharing website
references:
    - https://research.nccgroup.com/2021/05/27/detecting-rclone-an-effective-tool-for-exfiltration/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-01-16
tags:
    - attack.exfiltration
    - attack.t1567.002
logsource:
    product: windows
    service: dns-client
    definition: 'Requirements: Microsoft-Windows-DNS Client Events/Operational Event Log must be enabled/collected in order to receive the events.'
detection:
    selection:
        EventID: 3008
        QueryName|contains: 'userstorage.mega.co.nz'
    condition: selection
falsepositives:
    - Legitimate DNS queries and usage of Mega
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate DNS queries and usage of Mega

Source references

• https://research.nccgroup.com/2021/05/27/detecting-rclone-an-effective-tool-for-exfiltration/