Detection rules › Sigma
Firewall deactivation (deprecated command)
Detects scenarios where an attacker disabled the Windows Firewall to evade defense.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1562.004 Impair Defenses: Disable or Modify System Firewall |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Firewall deactivation (deprecated command)
description: Detects scenarios where an attacker disabled the Windows Firewall to evade defense.
references:
- https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0005-Defense%20Evasion/T1562.004-Impair%20Defenses-Disable%20or%20Modify%20System%20Firewall
- https://www.winhelponline.com/blog/enable-and-disable-windows-firewall-quickly-using-command-line/
- https://www.securonix.com/blog/securonix-threat-labs-security-advisory-threat-actors-target-mssql-servers-in-dbjammer-to-deliver-freeworld-ransomware/
tags:
- attack.defense_evasion
- attack.t1562.004
author: mdecrevoisier
status: experimental
logsource:
product: windows
category: process_creation
detection:
selection_event:
EventID: 4688
NewProcessName|endswith: '\netsh.exe' # Full path "C:\Windows\system32\netsh.exe"
selection_command:
Commandline|contains|all: # full command 'netsh firewall set opmode disable'
- firewall
- set
- opmode
- disable
selection_obfuscated: # full command 'netsh f s o d'
Commandline|contains|all:
- netsh
- ' f*' # firewall
- ' s*' # set
- ' o*' # opmode
- ' d*' # disable
condition: selection_event and (selection_command or selection_obfuscated)
falsepositives:
- Administrator activity
level: high
Stages and Predicates
Stage 0: condition
selection_event and (selection_command or selection_obfuscated)Stage 1: selection_event
selection_event:
EventID: 4688
NewProcessName|endswith: '\netsh.exe'
Stage 2: selection_command
selection_command:
Commandline|contains|all:
- firewall
- set
- opmode
- disable
Stage 3: selection_obfuscated
selection_obfuscated:
Commandline|contains|all:
- netsh
- ' f*'
- ' s*'
- ' o*'
- ' d*'
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.
| Field | Kind | Values |
|---|---|---|
Commandline | match |
|
NewProcessName | ends_with |
|