DNS Query To MEGA Hosting Website — Sigma Rule

Rule metadata and linked tags

Author: Aaron Greetham (@beardofbinary) - NCC Group. Source status: test; severity: medium. Source dates: 2021-05-26 / 2023-09-18.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0044a476dc357cecfe489b58bd7f651608dd08e70f9a2e6fe7a9f67984ef49da

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
id: 613c03ba-0779-4a53-8a1f-47f914a4ded3
related:
    - id: 66474410-b883-415f-9f8d-75345a0a66a6
      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: Aaron Greetham (@beardofbinary) - NCC Group
date: 2021-05-26
modified: 2023-09-18
tags:
    - attack.exfiltration
    - attack.t1567.002
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        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/