Sysmon DNS Query for anonfiles.com Domain

ATT&CK techniques

Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1567.002Exfiltration to Cloud Storage
Impact

What it detects

This rule flags DNS queries whose query name contains ".anonfiles.com". Attackers may use lookups to resolve domains associated with anonymous file hosting for staging or exfiltration workflows. It relies on Sysmon Windows telemetry for DNS query events, specifically the queried name field.

Reporting behind it

Related detections9 linkedT1567.002 — drag to rearrange

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Rclone SMB Share Exfiltration

Suspicious Data Exfiltration via Rclone to Cloud Storage (via process_creation)

Malicious Data Exfiltration via MEGAcmd

Suspicious Command and Control via Discord or Telegram Bot API

Data Exfiltration to WebDAV Share via curl Upload

Sysmon DNS Query for anonfiles.com Domain

Pivot detection · T1567.002 · 9 related

Changelog

v2

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-sysmon-dns-query-for-anonfiles-com-domain-065cceea

title: Sysmon DNS Query for anonfiles.com Domain
id: 968ee27e-dcb1-49ad-be2b-5f201268ff80
related:
  - id: 29f171d7-aa47-42c7-9c7b-3c87938164d9
    type: similar
  - id: 065cceea-77ec-4030-9052-fc0affea7110
    type: derived
status: test
description: This rule flags DNS queries whose query name contains ".anonfiles.com". Attackers may use lookups to resolve domains associated with anonymous file hosting for staging or exfiltration workflows. It relies on Sysmon Windows telemetry for DNS query events, specifically the queried name field.
references:
  - https://www.trendmicro.com/vinfo/us/security/news/ransomware-spotlight/ransomware-spotlight-blackbyte
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/dns_query/dns_query_win_anonymfiles_com.yml
author: pH-T (Nextron Systems), Huntrule Team
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
license: DRL-1.1

Convert

This rule as a query you can run. Uses no unlock credit.

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