Cloudflared Tunnels Related DNS Requests

calendar Dec 21, 2023 · attack.command_and_control attack.t1071.001  ·
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Detects DNS query requests to Cloudflared tunnels domains.

Sigma rule (View on GitHub)

 1title: Cloudflared Tunnels Related DNS Requests
 2id: a1d9eec5-33b2-4177-8d24-27fe754d0812
 3status: experimental
 4description: Detects DNS query requests to Cloudflared tunnels domains.
 5references:
 6    - https://www.guidepointsecurity.com/blog/tunnel-vision-cloudflared-abused-in-the-wild/
 7    - Internal Research
 8author: Nasreddine Bencherchali (Nextron Systems)
 9date: 2023/12/20
10tags:
11    - attack.command_and_control
12    - attack.t1071.001
13logsource:
14    category: dns_query
15    product: windows
16detection:
17    selection:
18        QueryName|endswith:
19            - '.v2.argotunnel.com'
20            - 'protocol-v2.argotunnel.com'
21            - 'trycloudflare.com'
22            - 'update.argotunnel.com'
23    condition: selection
24falsepositives:
25    - Legitimate use of cloudflare tunnels will also trigger this.
26level: medium

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