Suspicious WMIC XSL Script Execution

 1[metadata]
 2creation_date = "2020/09/02"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies WMIC allowlist bypass techniques by alerting on suspicious execution of scripts. When WMIC loads scripting
11libraries it may be indicative of an allowlist bypass.
12"""
13from = "now-9m"
14index = [
15    "winlogbeat-*",
16    "logs-endpoint.events.process-*",
17    "logs-endpoint.events.library-*",
18    "logs-windows.sysmon_operational-*",
19]
20language = "eql"
21license = "Elastic License v2"
22name = "Suspicious WMIC XSL Script Execution"
23risk_score = 47
24rule_id = "7f370d54-c0eb-4270-ac5a-9a6020585dc6"
25severity = "medium"
26tags = [
27    "Domain: Endpoint",
28    "OS: Windows",
29    "Use Case: Threat Detection",
30    "Tactic: Defense Evasion",
31    "Tactic: Execution",
32    "Data Source: Elastic Defend",
33    "Data Source: Sysmon",
34]
35type = "eql"
36
37query = '''
38sequence by process.entity_id with maxspan = 2m
39[process where host.os.type == "windows" and event.type == "start" and
40   (process.name : "WMIC.exe" or process.pe.original_file_name : "wmic.exe") and
41   process.args : ("format*:*", "/format*:*", "*-format*:*") and
42   not process.command_line : ("* /format:table *", "* /format:table")]
43[any where host.os.type == "windows" and (event.category == "library" or (event.category == "process" and event.action : "Image loaded*")) and
44 (?dll.name : ("jscript.dll", "vbscript.dll") or file.name : ("jscript.dll", "vbscript.dll"))]
45'''
46
47
48[[rule.threat]]
49framework = "MITRE ATT&CK"
50[[rule.threat.technique]]
51id = "T1220"
52name = "XSL Script Processing"
53reference = "https://attack.mitre.org/techniques/T1220/"
54
55
56[rule.threat.tactic]
57id = "TA0005"
58name = "Defense Evasion"
59reference = "https://attack.mitre.org/tactics/TA0005/"
60[[rule.threat]]
61framework = "MITRE ATT&CK"
62[[rule.threat.technique]]
63id = "T1047"
64name = "Windows Management Instrumentation"
65reference = "https://attack.mitre.org/techniques/T1047/"
66
67
68[rule.threat.tactic]
69id = "TA0002"
70name = "Execution"
71reference = "https://attack.mitre.org/tactics/TA0002/"