DNS Query for Anonfiles.com Domain - DNS Client — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. 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: 964d4db5ec9c1d3dd5c9c852ec3ae08aa9c6ba011f34632ff387434366e38c57

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 for Anonfiles.com Domain - DNS Client
id: 29f171d7-aa47-42c7-9c7b-3c87938164d9
related:
    - id: 065cceea-77ec-4030-9052-fc0affea7110
      type: similar
status: test
description: Detects DNS queries for anonfiles.com, which is an anonymous file upload platform often used for malicious purposes
references:
    - https://www.trendmicro.com/vinfo/us/security/news/ransomware-spotlight/ransomware-spotlight-blackbyte
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: '.anonfiles.com'
    condition: selection
falsepositives:
    - Rare legitimate access to anonfiles.com
level: high

Original YAML and metadata in JSON

False positives

• Rare legitimate access to anonfiles.com

Source references

• https://www.trendmicro.com/vinfo/us/security/news/ransomware-spotlight/ransomware-spotlight-blackbyte