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Detection rules › Sigma

New Firewall Rule Added In Windows Firewall Exception List Via WmiPrvSE.EXE

Status
test
Severity
medium
Log source
product windows, service firewall-as
Author
frack113, Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the addition of a new "Allow" firewall rule by the WMI process (WmiPrvSE.EXE). This can occur if an attacker leverages PowerShell cmdlets such as "New-NetFirewallRule", or directly uses WMI CIM classes such as "MSFT_NetFirewallRule".

MITRE ATT&CK coverage

TacticTechniques
Defense ImpairmentT1686.003 Disable or Modify System Firewall: Windows Host Firewall

Event coverage

ProviderEvent
Windows-Firewall-With-Advanced-SecurityEvent ID 2004
Windows-Firewall-With-Advanced-SecurityEvent ID 2071
Windows-Firewall-With-Advanced-SecurityEvent ID 2097

Rule body yaml

title: New Firewall Rule Added In Windows Firewall Exception List Via WmiPrvSE.EXE
id: eca81e8d-09e1-4d04-8614-c91f44fd0519
status: test
description: |
    Detects the addition of a new "Allow" firewall rule by the WMI process (WmiPrvSE.EXE).
    This can occur if an attacker leverages PowerShell cmdlets such as "New-NetFirewallRule", or directly uses WMI CIM classes such as "MSFT_NetFirewallRule".
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/
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2024-05-10
tags:
    - attack.defense-impairment
    - attack.t1686.003
logsource:
    product: windows
    service: firewall-as
detection:
    selection:
        EventID:
            - 2004 # A rule has been added to the Windows Defender Firewall exception list
            - 2071 # A rule has been added to the Windows Defender Firewall exception list. (Windows 11)
            - 2097
        Action: 3 # Allow
        ModifyingApplication|endswith: ':\Windows\System32\wbem\WmiPrvSE.exe'
    condition: selection
falsepositives:
    - Administrator scripts or activity.
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID:
        - 2004
        - 2071
        - 2097
    Action: 3
    ModifyingApplication|endswith: ':\Windows\System32\wbem\WmiPrvSE.exe'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Actioneq
  • 3 corpus 2 (sigma 2)
ModifyingApplicationends_with
  • :\Windows\System32\wbem\WmiPrvSE.exe