Suspicious SSH Reverse Tunnel Execution via process_creation

PremiumReviewedSigma · Medium · v1
Product
windows
Category
process_creation
Author
HuntRule
Published
2026-09-30
Updated
2026-09-30

ATT&CK techniques

Lateral Movement → C2
  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Collection

  11. Exfiltration

  12. Impact

What it detects

This rule detects ssh.exe launched with the -N and -R flags used to establish a remote port forward without an interactive session. MuddyWater used this technique to open a reverse tunnel to attacker infrastructure, enabling persistent remote access and pivoting into the victim network while blending with legitimate SSH usage.

Related detections9 linkedT1021.001 — drag to rearrange
Obfuscated RDP Tunneling Configuration Enabled for Port Forwarding (via process_creation)
Malicious RDP Tunneling (via rdp)
Possible Ngrok RDP Tunnel Exposure via TCP 3389
Port Forwarding via SSH.EXE on Windows
Windows svchost.exe RDP (3389) Connections to HTTP/HTTPS Ports 80 or 443
Windows Plink Remote Port Forwarding via -R Command Line
Windows svchost RDP via Reverse SSH Loopback Tunnel to 127.0.0.0/8:3389
Malicious Cloudflared Tunnel Execution via Cloudflared
Suspicious Remote Desktop Enablement via Registry fDenyTSConnections
Suspicious SSH Reverse Tunnel Execution via process_creation
Pivot detection · T1021.001 · 9 related

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