New Firewall Rule Added Via Netsh.EXE

 1title: New Firewall Rule Added Via Netsh.EXE
 2id: cd5cfd80-aa5f-44c0-9c20-108c4ae12e3c
 3status: test
 4description: Detects the addition of a new rule to the Windows firewall via netsh
 5references:
 6    - https://web.archive.org/web/20190508165435/https://www.operationblockbuster.com/wp-content/uploads/2016/02/Operation-Blockbuster-RAT-and-Staging-Report.pdf
 7author: Markus Neis, Sander Wiebing
 8date: 2019-01-29
 9modified: 2023-02-10
10tags:
11    - attack.defense-evasion
12    - attack.t1562.004
13    - attack.s0246
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection_img:
19        - Image|endswith: '\netsh.exe'
20        - OriginalFileName: 'netsh.exe'
21    selection_cli:
22        CommandLine|contains|all:
23            - ' firewall '
24            - ' add '
25    filter_optional_dropbox:
26        CommandLine|contains:
27            - 'advfirewall firewall add rule name=Dropbox dir=in action=allow "program=?:\Program Files (x86)\Dropbox\Client\Dropbox.exe" enable=yes profile=Any'
28            - 'advfirewall firewall add rule name=Dropbox dir=in action=allow "program=?:\Program Files\Dropbox\Client\Dropbox.exe" enable=yes profile=Any'
29    condition: all of selection_* and not 1 of filter_optional_*
30falsepositives:
31    - Legitimate administration activity
32    - Software installations
33level: medium