IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Windows Suspicious Script Object Executionedit
Identifies scrobj.dll loaded into unusual Microsoft processes. This usually means a malicious scriptlet is being executed in the target process.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- winlogbeat-*
- logs-windows.*
Severity: medium
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 3 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 7.12.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule queryedit
/* add winlogbeat-* when process.code_signature.* fields are populated
*/ sequence by process.entity_id with maxspan = 2m [process where
event.type in ("start", "process_started") and /* uncomment once
in winlogbeat */ /* process.code_signature.subject_name :
"Microsoft Corporation" and process.code_signature.trusted : true and
*/ not process.name : ( "cscript.exe",
"iexplore.exe", "MicrosoftEdge.exe", "msiexec.exe",
"smartscreen.exe", "taskhostw.exe", "w3wp.exe",
"wscript.exe")] [library where event.type == "start" and dll.name :
"scrobj.dll"]
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Rule version historyedit
- Version 3 (7.12.0 release)
-
-
Updated query, changed from:
/* add winlogbeat-* when process.code_signature.* fields are populated */ sequence by process.entity_id with maxspan=2m [process where event.type in ("start", "process_started") and /* uncomment once in winlogbeat */ /* process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true and */ not (process.name : "cscript.exe" or process.name : "iexplore.exe" or process.name : "MicrosoftEdge.exe" or process.name : "msiexec.exe" or process.name : "smartscreen.exe" or process.name : "taskhostw.exe" or process.name : "w3wp.exe" or process.name : "wscript.exe")] [library where event.type == "start" and file.name : "scrobj.dll"]
-
- Version 2 (7.11.0 release)
-
- Formatting only