Suspicious SSH Reverse Tunnel Over Port 443 via ssh.exe by UNC1549

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 the native Windows ssh.exe client establishing a reverse tunnel with the -R flag over port 443 as observed in UNC1549 operations. Attackers tunnel internal services outbound over an HTTPS port to blend with normal web traffic and bypass egress controls.

Reporting behind it

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Suspicious SSH Reverse Tunnel Over Port 443 via ssh.exe by UNC1549

Pivot detection · T1572 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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