Suspicious Cloudflared Tunnel Execution for Command and Control by Kraken Ransomware

ATT&CK techniques

C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1572Protocol Tunneling
Exfiltration
Impact

What it detects

This rule detects execution of the cloudflared client to establish an outbound tunnel. The Kraken ransomware group abuses Cloudflare Tunnel together with SSHFS and RDP to maintain covert access and move laterally. Attacker use of cloudflared can bypass perimeter controls by tunneling traffic over trusted Cloudflare infrastructure.

Reporting behind it

Related detections9 linkedT1572 — drag to rearrange

Suspicious OpenSSH Reverse Tunnel Over HTTPS Port (Chaos Ransomware)

Possible Plink Reverse Tunnel Command Line Execution

Chisel Reverse Tunnel Tool Execution from Temporary Directory

Malicious Anubis Ransomware Cloudflare Tunnel via cloudflared (via process_creation)

Obfuscated RDP Tunneling Configuration Enabled for Port Forwarding (via process_creation)

Malicious RDP Tunneling (via rdp)

Suspicious SSH Reverse Tunnel via Renamed plink Utility on Triofox Host

Suspicious OpenSSH Reverse Tunnel Establishment via ssh.exe

Suspicious HelloNet SSH Reverse Tunnel via frontpage.exe (via process_creation)

Suspicious Cloudflared Tunnel Execution for Command and Control by Kraken Ransomware

Pivot detection · T1572 · 9 related

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