Suspicious OpenSSH Reverse Tunnel Over HTTPS Port (Chaos Ransomware)

ATT&CK techniques

Lateral Movement → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
- T1021.004SSH
Collection
C2
- T1572Protocol Tunneling
Exfiltration
Impact

What it detects

This rule detects use of the OpenSSH client to establish a reverse tunnel with the -R option forwarding traffic over port 443. The Chaos ransomware group abuses OpenSSH reverse tunneling to blend remote access and command-and-control into HTTPS traffic. Reverse tunnels over common web ports are used to evade network monitoring and maintain covert access.

Reporting behind it

Related detections9 linkedT1572 — drag to rearrange

Suspicious Reverse SSH Tunnel Exposing Local SSH via process_creation

Suspicious OpenSSH Reverse Tunnel Creation via Process Creation

Port Forwarding via SSH.EXE on Windows

Suspicious DNS Query to Dynamic DNS and Tunneling Providers Abused by RATs

Suspicious SSH Reverse Tunnel Over DNS Port

Suspicious Remote Apple Events Enablement via systemsetup

Suspicious vCenter VAMI SSH Enable via appliance access API

Suspicious OpenSSH Reverse Tunnel Establishment via process_creation

Suspicious LocalToNet Tunneling Tool Execution

Suspicious OpenSSH Reverse Tunnel Over HTTPS Port (Chaos Ransomware)

Pivot detection · T1572 · 9 related

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