System Scripts Autorun Keys Modification

Severity: medium
Author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split)
Source: upstream

Detects modification of autostart extensibility point (ASEP) in registry.

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1547.001` Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
Privilege Escalation	`T1547.001` Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder

Event coverage

Provider	Event ID	Title
Sysmon	13	RegistryEvent (Value Set)

Stages and Predicates

Stage 1: `scripts_base`

TargetObject|contains: '\Software\Policies\Microsoft\Windows\System\Scripts'

Stage 2: `scripts`

or:
TargetObject|contains: '\Logoff'
TargetObject|contains: '\Logon'
TargetObject|contains: '\Shutdown'
TargetObject|contains: '\Startup'

Stage 3: `not filter`

Details: '(Empty)'

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
`Details`	eq	`(Empty)` corpus 24 (sigma 24)
`TargetObject`	match	`\Logoff` `\Logon` `\Shutdown` `\Software\Policies\Microsoft\Windows\System\Scripts` `\Startup`