Convert indexed Sigma rules into analyst-ready detections.
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pySigma Versions
2
Newest: 2.0.1
Translation Workspace
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Active Rule
Allow Exceptions in Microsoft Defender Firewall via Registry
Backends follow their supported pySigma version. Select 1.5.1 for Elasticsearch, Kusto, and other 1.x plugins.
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Allow Exceptions in Microsoft Defender Firewall via Registry
Using Splunk · Default · pySigma 2.0.1
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
title: Allow Exceptions in Microsoft Defender Firewall via Registry
id: c69fc6a2-607d-4530-b7d1-75823af1bde4
status: experimental
description: |
Detects the degradation of the system firewall security by the DoNotAllowExceptions policy value being
set to 0 (DWORD 0x00000000), which re-enables application and port exceptions in the Microsoft
Defender Firewall and can restore network paths that a hardened profile would block.
references:
- https://www.virustotal.com/gui/file/da209017000b9812e8bc5f4e8db6499430ee2aadc72ef896964cffdfd896f143/behavior
- https://app.any.run/tasks/8d4113a8-5403-4367-a79f-4ce4978d9bdb
- https://www.zscaler.com/fr/blogs/security-research/malvertising-targeting-european-transit-users
- https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/trojan.win32.zbot.e
author: frack113
date: 2026-10-13
tags:
- attack.defense-impairment
- attack.t1686.003
logsource:
category: registry_set
product: windows
detection:
selection:
TargetObject|contains: '\Services\SharedAccess\Parameters\FirewallPolicy\'
TargetObject|endswith: '\DoNotAllowExceptions'
Details: 'DWORD (0x00000000)'
filter_main_svchost:
Image:
- 'C:\Windows\System32\svchost.exe'
- 'C:\Windows\SysWOW64\svchost.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: medium
regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_allow_defender_firewall_exceptions/info.yml
CLI command
Sigma CLI 4.0.0 · Install matching versions, then run from the Phoenix project directory.
python -m pip install 'sigma-cli==4.0.0' 'pysigma==2.0.1' 'pysigma-backend-splunk==3.0.0'
sigma convert --without-pipeline -t splunk -f default 'sigma/rules/windows/registry/registry_set/registry_set_allow_defender_firewall_exceptions.yml'