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Detection rules › Sigma

DNS Query To MEGA Hosting Website - DNS Client

Status
test
Severity
medium
Log source
product windows, service dns-client
Author
Nasreddine Bencherchali (Nextron Systems)
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
DNS-ClientEvent ID 3008: DNS query is completed for the name QueryName, type QueryType, query options QueryOptions with status QueryStatus Results QueryResults.

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 3008
    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"