Cloudflared Tunnel Execution

calendar Dec 21, 2023 · attack.command_and_control attack.t1102 attack.t1090 attack.t1572  ·
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Detects execution of the "cloudflared" tool to connect back to a tunnel. This was seen used by threat actors to maintain persistence and remote access to compromised networks.

Sigma rule (View on GitHub)

 1title: Cloudflared Tunnel Execution
 2id: 9a019ffc-3580-4c9d-8d87-079f7e8d3fd4
 3status: experimental
 4description: Detects execution of the "cloudflared" tool to connect back to a tunnel. This was seen used by threat actors to maintain persistence and remote access to compromised networks.
 5references:
 6    - https://blog.reconinfosec.com/emergence-of-akira-ransomware-group
 7    - https://github.com/cloudflare/cloudflared
 8    - https://developers.cloudflare.com/cloudflare-one/connections/connect-apps
 9author: Janantha Marasinghe, Nasreddine Bencherchali (Nextron Systems)
10date: 2023/05/17
11modified: 2023/12/20
12tags:
13    - attack.command_and_control
14    - attack.t1102
15    - attack.t1090
16    - attack.t1572
17logsource:
18    category: process_creation
19    product: windows
20detection:
21    selection:
22        CommandLine|contains|all:
23            - ' tunnel '
24            - ' run '
25        CommandLine|contains:
26            - '-config '
27            - '-credentials-contents '
28            - '-credentials-file '
29            - '-token '
30    condition: selection
31falsepositives:
32    - Legitimate usage of Cloudflared tunnel.
33level: medium

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