Suspicious Program Location Whitelisted In Firewall Via Netsh.EXE

Severity: high
Author: Sander Wiebing, Jonhnathan Ribeiro, Daniil Yugoslavskiy, oscd.community
Source: upstream

Detects Netsh command execution that whitelists a program located in a suspicious location in the Windows Firewall

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1562.004` Impair Defenses: Disable or Modify System Firewall

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

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

Stage 2: `all of selection_cli`

or:
CommandLine|contains: 'action=allow'
CommandLine|contains: add
CommandLine|contains: advfirewall
CommandLine|contains: firewall
CommandLine|contains: 'program='
CommandLine|contains: rule
CommandLine|contains: add
CommandLine|contains: allowedprogram
CommandLine|contains: firewall

Stage 3: `all of selection_paths`

or:
CommandLine|contains: '%Public%\'
CommandLine|contains: '%TEMP%'
CommandLine|contains: '%TMP%'
CommandLine|contains: ':\$Recycle.bin\'
CommandLine|contains: ':\RECYCLER.BIN\'
CommandLine|contains: ':\RECYCLERS.BIN\'
CommandLine|contains: ':\SystemVolumeInformation\'
CommandLine|contains: ':\Temp\'
CommandLine|contains: ':\Users\Default\'
CommandLine|contains: ':\Users\Desktop\'
CommandLine|contains: ':\Users\Public\'
CommandLine|contains: ':\Windows\Tasks\'
CommandLine|contains: ':\Windows\Temp\'
CommandLine|contains: ':\Windows\addins\'
CommandLine|contains: ':\Windows\cursors\'
CommandLine|contains: ':\Windows\debug\'
CommandLine|contains: ':\Windows\drivers\'
CommandLine|contains: ':\Windows\fonts\'
CommandLine|contains: ':\Windows\help\'
CommandLine|contains: ':\Windows\system32\tasks\'
CommandLine|contains: '\Downloads\'
CommandLine|contains: '\Local Settings\Temporary Internet Files\'
CommandLine|contains: '\Temporary Internet Files\Content.Outlook\'

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	`%Public%\` `%TEMP%` corpus 2 (sigma 2) `%TMP%` corpus 2 (sigma 2) `:\$Recycle.bin\` `:\RECYCLER.BIN\` `:\RECYCLERS.BIN\` `:\SystemVolumeInformation\` `:\Temp\` corpus 14 (sigma 14) `:\Users\Default\` corpus 3 (sigma 3) `:\Users\Desktop\` `:\Users\Public\` corpus 14 (sigma 14) `:\Windows\Tasks\` corpus 6 (sigma 6) `:\Windows\Temp\` corpus 15 (sigma 15) `:\Windows\addins\` `:\Windows\cursors\` `:\Windows\debug\` `:\Windows\drivers\` `:\Windows\fonts\` `:\Windows\help\` `:\Windows\system32\tasks\` `\Downloads\` corpus 12 (sigma 12) `\Local Settings\Temporary Internet Files\` `\Temporary Internet Files\Content.Outlook\` `action=allow` `add` corpus 16 (sigma 16) `advfirewall` corpus 3 (sigma 3) `allowedprogram` `firewall` corpus 4 (sigma 4) `program=` `rule` corpus 2 (sigma 2)
`Image`	ends_with	`\netsh.exe` corpus 16 (sigma 16)
`OriginalFileName`	eq	`netsh.exe` corpus 14 (sigma 14)