Gpscript Execution

Severity: medium
Author: frack113
Source: upstream

Detects the execution of the LOLBIN gpscript, which executes logon or startup scripts configured in Group Policy

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1218` System Binary Proxy Execution

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\gpscript.exe'
OriginalFileName: GPSCRIPT.EXE

Stage 2: `all of selection_cli`

or:
CommandLine|contains: ' /logon'
CommandLine|contains: ' /startup'

Stage 3: `not 1 of filter_main_svchost`

ParentCommandLine: 'C:\windows\system32\svchost.exe -k netsvcs -p -s gpsvc'

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	`/logon` `/startup`
`Image`	ends_with	`\gpscript.exe`
`OriginalFileName`	eq	`GPSCRIPT.EXE`
`ParentCommandLine`	eq	`C:\windows\system32\svchost.exe -k netsvcs -p -s gpsvc`