Windows Firewall Disabled via PowerShelledit
Identifies when the Windows Firewall is disabled using PowerShell cmdlets, which attackers do to evade network constraints, like internet and network lateral communication restrictions.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- winlogbeat-*
- logs-windows.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://docs.microsoft.com/en-us/powershell/module/netsecurity/set-netfirewallprofile?view=windowsserver2019-ps
- https://www.tutorialspoint.com/how-to-get-windows-firewall-profile-settings-using-powershell
- http://powershellhelp.space/commands/set-netfirewallrule-psv5.php
- http://woshub.com/manage-windows-firewall-powershell/
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 1
Added (Elastic Stack release): 8.0.0
Rule authors: Austin Songer
Rule license: Elastic License v2
Potential false positivesedit
Windows Firewall can be disabled may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Windows Profile being disabled from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
Rule queryedit
process where event.action == "start" and (process.name :
("powershell.exe", "pwsh.exe", "powershell_ise.exe") or
process.pe.original_file_name == "PowerShell.EXE") and process.args
: "*Set-NetFirewallProfile*" and (process.args : "*-Enabled*" and
process.args : "*False*") and (process.args : "*-All*" or
process.args : ("*Public*", "*Domain*", "*Private*"))
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/