Uncommon New Firewall Rule Added In Windows Firewall Exception List
Detects when a rule has been added to the Windows Firewall exception list
Sigma rule (View on GitHub)
1title: Uncommon New Firewall Rule Added In Windows Firewall Exception List
2id: cde0a575-7d3d-4a49-9817-b8004a7bf105
3status: test
4description: Detects when a rule has been added to the Windows Firewall exception list
5references:
6 - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd364427(v=ws.10)
7author: frack113
8date: 2022-02-19
9modified: 2025-10-08
10tags:
11 - attack.defense-evasion
12 - attack.t1562.004
13logsource:
14 product: windows
15 service: firewall-as
16detection:
17 selection:
18 EventID:
19 - 2004 # A rule has been added to the Windows Defender Firewall exception list
20 - 2071 # A rule has been added to the Windows Defender Firewall exception list. (Windows 11)
21 - 2097
22 filter_main_block:
23 Action: 2 # Block
24 filter_main_generic:
25 ApplicationPath|startswith:
26 - 'C:\Program Files (x86)\'
27 - 'C:\Program Files\'
28 - 'C:\Windows\System32\'
29 - 'C:\Windows\SysWOW64\'
30 - 'C:\Windows\WinSxS\'
31 filter_main_covered_paths:
32 # This filter is added to avoid duplicate alerting from 9e2575e7-2cb9-4da1-adc8-ed94221dca5e
33 ApplicationPath|contains:
34 - 'C:\PerfLogs\'
35 - 'C:\Temp\'
36 - 'C:\Tmp\'
37 - 'C:\Users\Public\'
38 - 'C:\Windows\Tasks\'
39 - 'C:\Windows\Temp\'
40 - '\AppData\Local\Temp\'
41 filter_main_system_dllhost:
42 ApplicationPath: 'System'
43 ModifyingApplication: 'C:\Windows\System32\dllhost.exe'
44 filter_main_tiworker:
45 ModifyingApplication|startswith: 'C:\Windows\WinSxS\'
46 ModifyingApplication|endswith: '\TiWorker.exe'
47 filter_main_null:
48 ApplicationPath: null
49 filter_optional_no_path:
50 # This filter filters a lot of FPs related to Windows Services
51 ModifyingApplication:
52 - 'C:\Windows\System32\svchost.exe'
53 - 'C:\Windows\System32\dllhost.exe'
54 ApplicationPath: ''
55 filter_optional_msmpeng:
56 - ModifyingApplication|startswith:
57 - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
58 - 'C:\Program Files\Windows Defender\'
59 ModifyingApplication|endswith: '\MsMpEng.exe'
60 - ApplicationPath|startswith:
61 - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
62 - 'C:\Program Files\Windows Defender\'
63 ApplicationPath|endswith: '\MsMpEng.exe'
64 condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
65level: medium
References
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