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

Rule metadata and linked tags

Author: pH-T (Nextron Systems). Source status: test; severity: high. Source dates: 2022-07-15 / 2023-01-16.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6a01c2c6a1bb6affc5c3d40aa7b2b7f4640e899244c45e8c75911ad562970131

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 - Sysmon
id: 065cceea-77ec-4030-9052-fc0affea7110
related:
    - id: 29f171d7-aa47-42c7-9c7b-3c87938164d9
      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: pH-T (Nextron Systems)
date: 2022-07-15
modified: 2023-01-16
tags:
    - attack.exfiltration
    - attack.t1567.002
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        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