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Suspicious WMIC XSL Script Execution

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Suspicious WMIC XSL Script Execution

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Identifies WMIC allowlist bypass techniques by alerting on suspicious execution of scripts. When WMIC loads scripting libraries it may be indicative of an allowlist bypass.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*

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

Version: 105

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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sequence by process.entity_id with maxspan = 2m
[process where host.os.type == "windows" and event.type == "start" and
   (process.name : "WMIC.exe" or process.pe.original_file_name : "wmic.exe") and
   process.args : ("format*:*", "/format*:*", "*-format*:*") and
   not process.command_line : "* /format:table *"]
[any where host.os.type == "windows" and (event.category == "library" or (event.category == "process" and event.action : "Image loaded*")) and
 (dll.name : ("jscript.dll", "vbscript.dll") or file.name : ("jscript.dll", "vbscript.dll"))]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: XSL Script Processing
- ID: T1220
- Reference URL: https://attack.mitre.org/techniques/T1220/

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