Suspicious Firewall Rule Allowing SSH via New-NetFirewallRule During Ransomware

ATT&CK techniques

Lateral Movement

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
- T1021.001Remote Desktop Protocol
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a PowerShell New-NetFirewallRule command that opens the host for sshd inbound access as observed when ransomware operators enable SSH for lateral movement and persistence. Attackers create this rule to establish a resilient remote access path across the environment.

Reporting behind it

Related detections9 linkedT1021.001 — drag to rearrange

Suspicious Firewall Rule Added to Open RDP Port 3389 via netsh

Suspicious Remote Desktop Enablement via Registry fDenyTSConnections and Firewall Rule (via process_creation)

Malicious Remote Desktop Enablement via Netsh

Suspicious iptables Port Redirect Rule via GRIMBOLT

Malicious RDP Tunneling via ngrok (via process_creation)

Suspicious Remote Desktop Enablement via Registry By Ransomware

Suspicious Remote Desktop Enablement via netsh Firewall Rule (via process_creation)

Suspicious RDP Enablement via netsh Firewall Rule

Suspicious Firewall Allow Rule for TightVNC Server via netsh (via process_creation)

Suspicious Firewall Rule Allowing SSH via New-NetFirewallRule During Ransomware

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.

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