Suspicious Enabling of Network Discovery Firewall Rules via PowerShell

ATT&CK techniques

Discovery

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
- T1135Network Share Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects enabling of the Network Discovery firewall rule group via PowerShell, the step The Gentlemen ransomware took to widen host visibility for lateral movement. Programmatically enabling network discovery firewall rules during an intrusion facilitates spread across the environment.

Reporting behind it

Related detections9 linkedT1135 — drag to rearrange

Malicious Network Share Discovery And/or Connection via Commandline (via process_creation)

NetScan Share Enumeration Write Access Check

Suspicious Network Share Enumeration via SharpShares

Suspicious SharpShares Network Share Enumeration Tool Execution

SharpHound Enumeration via SMB Named Pipes (via security)

Uncommon Network Share Discovery via Net View (via process_creation)

Windows: Explorer opened from cmd.exe/powershell using shell:MyComputerFolder shortcut

Windows Process Creation: Advanced Port Scanner PUA Execution via /portable /lng

Windows Process Creation: SharpView.exe with Recon/Domain Discovery Cmdlets

Suspicious Enabling of Network Discovery Firewall Rules via PowerShell

Pivot detection · T1135 · 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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