Detection rules › Sigma

Firewall Disabled via Netsh.EXE

Severity
medium
Author
Fatih Sirin
Source
upstream

Detects netsh commands that turns off the Windows firewall

MITRE ATT&CK coverage

TacticTechniques
Defense EvasionT1562.004 Impair Defenses: Disable or Modify System Firewall

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation

Stages and Predicates

Stage 1: selection_img

or:
Image|endswith: '\netsh.exe'
OriginalFileName: netsh.exe

Stage 2: 1 of selection_cli_1

CommandLine|contains: disable
CommandLine|contains: firewall
CommandLine|contains: opmode
CommandLine|contains: set

Stage 3: 1 of selection_cli_2

CommandLine|contains: advfirewall
CommandLine|contains: off
CommandLine|contains: set
CommandLine|contains: state

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
CommandLinematch
  • advfirewall corpus 3 (sigma 3)
  • disable corpus 2 (sigma 2)
  • firewall corpus 4 (sigma 4)
  • off
  • opmode
  • set corpus 7 (sigma 7)
  • state
Imageends_with
  • \netsh.exe corpus 16 (sigma 16)
OriginalFileNameeq
  • netsh.exe corpus 14 (sigma 14)