detection.wiki

Detection rules › Sigma

System Scripts Autorun Keys Modification

Status
test
Severity
medium
Log source
category registry_set, product windows
Author
Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split)
Source
github.com/SigmaHQ/sigma

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

Known false positives

  • Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason
  • Legitimate administrator sets up autorun keys for legitimate reason

MITRE ATT&CK coverage

TacticTechniques
Persistence
Privilege Escalation

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 13: RegistryEvent (Value Set)

Rule body

title: System Scripts Autorun Keys Modification
id: e7a2fd40-3ae1-4a85-bf80-15cf624fb1b1
related:
    - id: 17f878b8-9968-4578-b814-c4217fc5768c
      type: obsolete
status: test
description: Detects modification of autostart extensibility point (ASEP) in registry.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.001/T1547.001.md
    - https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns
    - https://gist.github.com/GlebSukhodolskiy/0fc5fa5f482903064b448890db1eaf9d # a list with registry keys
author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split)
date: 2019-10-25
modified: 2023-08-17
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1547.001
logsource:
    category: registry_set
    product: windows
detection:
    scripts_base:
        TargetObject|contains: '\Software\Policies\Microsoft\Windows\System\Scripts'
    scripts:
        TargetObject|contains:
            - '\Startup'
            - '\Shutdown'
            - '\Logon'
            - '\Logoff'
    filter:
        Details: '(Empty)'
    condition: scripts_base and scripts and not filter
falsepositives:
    - Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason
    - Legitimate administrator sets up autorun keys for legitimate reason
level: medium

Stages and Predicates

Stage 0: condition

scripts_base and scripts and not filter

Stage 1: scripts_base

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

Stage 2: scripts

scripts:
    TargetObject|contains:
        - '\Startup'
        - '\Shutdown'
        - '\Logon'
        - '\Logoff'

Stage 3: not filter

filter:
    Details: '(Empty)'

Exclusions

The rule actively suppresses these predicates.

FieldKindExcluded valuesSearch
Detailseq(Empty)excludes:Details field:"Details" value:"(Empty)"

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
TargetObjectmatch
  • \Logoff
  • \Logon
  • \Shutdown
  • \Software\Policies\Microsoft\Windows\System\Scripts
  • \Startup
field:"TargetObject" kind:match