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Detection rules › Sigma

DNS Query for Anonfiles.com Domain - DNS Client

Status
test
Severity
high
Log source
product windows, service dns-client
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects DNS queries for anonfiles.com, which is an anonymous file upload platform often used for malicious purposes

Known false positives

  • Rare legitimate access to anonfiles.com

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 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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 3008
    QueryName|contains: '.anonfiles.com'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
QueryNamematch
  • .anonfiles.com corpus 2 (sigma 2)
field:"QueryName" kind:match value:".anonfiles.com"