IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Modification of AmsiEnable Registry Keyedit
JScript tries to query the AmsiEnable registry key from the HKEY_USERS registry hive before initializing Antimalware Scan Interface (AMSI). If this key is set to 0, AMSI is not enabled for the JScript process. An adversary can modify this key to disable AMSI protections.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
Severity: high
Risk score: 73
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 2 (version history)
Added (Elastic Stack release): 7.14.0
Last modified (Elastic Stack release): 7.15.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule queryedit
registry where event.type in ("creation", "change") and
registry.path: "HKEY_USERS\\*\\Software\\Microsoft\\Windows
Script\\Settings\\AmsiEnable" and registry.data.strings: "0"
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/
Rule version historyedit
- Version 2 (7.15.0 release)
-
- Formatting only