IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Suspicious Script Object Execution
editSuspicious Script Object Execution
editIdentifies 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.*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References: None
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 7
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by process.entity_id with maxspan=2m [process where event.type == "start" and (process.code_signature.subject_name in ("Microsoft Corporation", "Microsoft Windows") and process.code_signature.trusted == true) and not process.executable : ( "?:\\Windows\\System32\\cscript.exe", "?:\\Windows\\SysWOW64\\cscript.exe", "?:\\Program Files (x86)\\Internet Explorer\\iexplore.exe", "?:\\Program Files\\Internet Explorer\\iexplore.exe", "?:\\Windows\\SystemApps\\Microsoft.MicrosoftEdge_*\\MicrosoftEdge.exe", "?:\\Windows\\system32\\msiexec.exe", "?:\\Windows\\SysWOW64\\msiexec.exe", "?:\\Windows\\System32\\smartscreen.exe", "?:\\Windows\\system32\\taskhostw.exe", "?:\\windows\\system32\\inetsrv\\w3wp.exe", "?:\\windows\\SysWOW64\\inetsrv\\w3wp.exe", "?:\\Windows\\system32\\wscript.exe", "?:\\Windows\\SysWOW64\\wscript.exe", "?:\\Windows\\system32\\mobsync.exe", "?:\\Windows\\SysWOW64\\mobsync.exe", "?:\\Windows\\System32\\cmd.exe", "?:\\Windows\\SysWOW64\\cmd.exe")] [library where event.type == "start" and dll.name : "scrobj.dll"]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: System Binary Proxy Execution
- ID: T1218
- Reference URL: https://attack.mitre.org/techniques/T1218/