Windows Subsystem for Linux Enabled via Dism Utility

 1[metadata]
 2creation_date = "2023/01/13"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5updated_date = "2023/06/22"
 6min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 7min_stack_version = "8.3.0"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Detects attempts to enable the Windows Subsystem for Linux using Microsoft Dism utility. Adversaries may enable 
13and use WSL for Linux to avoid detection.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Windows Subsystem for Linux Enabled via Dism Utility"
20references = ["https://blog.f-secure.com/hunting-for-windows-subsystem-for-linux/"]
21risk_score = 47
22rule_id = "e2e0537d-7d8f-4910-a11d-559bcf61295a"
23severity = "medium"
24tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
25timestamp_override = "event.ingested"
26type = "eql"
27
28query = '''
29process where host.os.type == "windows" and event.type : "start" and
30 (process.name : "Dism.exe" or process.pe.original_file_name == "DISM.EXE") and 
31 process.command_line : "*Microsoft-Windows-Subsystem-Linux*"
32'''
33
34
35[[rule.threat]]
36framework = "MITRE ATT&CK"
37[[rule.threat.technique]]
38id = "T1202"
39name = "Indirect Command Execution"
40reference = "https://attack.mitre.org/techniques/T1202/"
41
42[rule.threat.tactic]
43id = "TA0005"
44name = "Defense Evasion"
45reference = "https://attack.mitre.org/tactics/TA0005/"