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Detection rules › Sigma

DNS Query To MEGA Hosting Website

Status
test
Severity
medium
Log source
category dns_query, product windows
Author
Aaron Greetham (@beardofbinary) - NCC Group
Source
github.com/SigmaHQ/sigma

Detects DNS queries for subdomains related to MEGA sharing website

Known false positives

  • Legitimate DNS queries and usage of Mega

MITRE ATT&CK coverage

TacticTechniques
Exfiltration

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 22: DNSEvent (DNS query)

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    QueryName|contains: 'userstorage.mega.co.nz'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
QueryNamematch
  • userstorage.mega.co.nz corpus 2 (sigma 2)
field:"QueryName" kind:match value:"userstorage.mega.co.nz"