Sigma rule: New Windows Firewall Rule Added Via New-NetFirewallRule Cmdlet - ScriptBlock

Rule

Title

New Windows Firewall Rule Added Via New-NetFirewallRule Cmdlet - ScriptBlock

Status

test

Level

low

Author

frack113

Date

2024-05-10

File

rules-threat-hunting/windows/powershell/powershell_script/posh_ps_new_netfirewallrule_allow.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when a powershell script contains calls to the "New-NetFirewallRule" cmdlet in order to add a new firewall rule with an "Allow" action.

Log source

product

windows

category

ps_script

definition

Requirements: Script Block Logging must be enabled

Detection

selection:
    ScriptBlockText|contains: 'New-NetFirewallRule*-Action*Allow'
condition: selection

False positives (as the rule lists them)

• Administrator script

Tags

• attack.defense-impairment
• attack.t1686.003
• detection.threat-hunting

MITRE ATT&CK ids this rule names

• T1686.003

Related rules

• 51483085-0cba-46a8-837e-4416496d6971 (similar)

References

• https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.004/T1562.004.md#atomic-test-24---set-a-firewall-rule-using-new-netfirewallrule
• https://malware.news/t/the-rhysida-ransomware-activity-analysis-and-ties-to-vice-society/72170
• https://cybersecuritynews.com/rhysida-ransomware-attacking-windows/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-threat-hunting/windows/powershell/powershell_script/posh_ps_new_netfirewallrule_allow.yml