Werfault ReflectDebugger Persistence

 1[metadata]
 2creation_date = "2023/08/29"
 3integration = ["endpoint", "m365_defender", "sentinel_one_cloud_funnel", "windows"]
 4maturity = "production"
 5updated_date = "2024/10/15"
 6min_stack_version = "8.14.0"
 7min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies the registration of a Werfault Debugger. Attackers may abuse this mechanism to execute malicious payloads
13every time the utility is executed with the "-pr" parameter.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.registry-*", "endgame-*", "logs-m365_defender.event-*", "logs-sentinel_one_cloud_funnel.*", "logs-windows.sysmon_operational-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Werfault ReflectDebugger Persistence"
20references = ["https://cocomelonc.github.io/malware/2022/11/02/malware-pers-18.html"]
21risk_score = 21
22rule_id = "205b52c4-9c28-4af4-8979-935f3278d61a"
23severity = "low"
24tags = [
25    "Domain: Endpoint",
26    "OS: Windows",
27    "Use Case: Threat Detection",
28    "Tactic: Persistence",
29    "Data Source: Elastic Endgame",
30    "Data Source: Elastic Defend",
31    "Data Source: Microsoft Defender for Endpoint",
32    "Data Source: SentinelOne",
33    "Data Source: Sysmon",
34]
35timestamp_override = "event.ingested"
36type = "eql"
37
38query = '''
39registry where host.os.type == "windows" and event.type == "change" and
40  registry.path : (
41    "HKLM\\Software\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger",
42    "\\REGISTRY\\MACHINE\\Software\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger",
43    "MACHINE\\Software\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger"
44  )
45'''
46
47
48[[rule.threat]]
49framework = "MITRE ATT&CK"
50[[rule.threat.technique]]
51id = "T1546"
52name = "Event Triggered Execution"
53reference = "https://attack.mitre.org/techniques/T1546/"
54
55
56[rule.threat.tactic]
57id = "TA0003"
58name = "Persistence"
59reference = "https://attack.mitre.org/tactics/TA0003/"
60[[rule.threat]]
61framework = "MITRE ATT&CK"
62[[rule.threat.technique]]
63id = "T1112"
64name = "Modify Registry"
65reference = "https://attack.mitre.org/techniques/T1112/"
66
67
68[rule.threat.tactic]
69id = "TA0005"
70name = "Defense Evasion"
71reference = "https://attack.mitre.org/tactics/TA0005/"