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.library-*
- logs-windows.sysmon_operational-*
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:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Defense Evasion
- Data Source: Elastic Defend
- Data Source: Sysmon
Version: 107
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
any where host.os.type == "windows" and
(event.category == "library" or (event.category == "process" and event.action : "Image loaded*")) and
(?dll.name : "scrobj.dll" or ?file.name : "scrobj.dll") and
process.executable : ("?:\\Windows\\System32\\*.exe", "?:\\Windows\\SysWOW64\\*.exe") and
not process.executable : (
"?:\\Windows\\System32\\cscript.exe",
"?:\\Windows\\SysWOW64\\cscript.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\\mshta.exe",
"?:\\Windows\\system32\\mobsync.exe",
"?:\\Windows\\SysWOW64\\mobsync.exe",
"?:\\Windows\\System32\\cmd.exe",
"?:\\Windows\\SysWOW64\\cmd.exe",
"?:\\Windows\\System32\\OpenWith.exe",
"?:\\Windows\\System32\\wbem\\WMIADAP.exe",
"?:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe")
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/
-
Sub-technique:
- Name: Regsvr32
- ID: T1218.010
- Reference URL: https://attack.mitre.org/techniques/T1218/010/