Registry Persistence via AppCert DLL

 1[metadata]
 2creation_date = "2020/11/18"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/03/28"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Detects attempts to maintain persistence by creating registry keys using AppCert DLLs. AppCert DLLs are loaded by every
13process using the common API functions to create processes.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.registry-*", "logs-windows.sysmon_operational-*", "endgame-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Registry Persistence via AppCert DLL"
20risk_score = 47
21rule_id = "513f0ffd-b317-4b9c-9494-92ce861f22c7"
22setup = """## Setup
23
24If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
25events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
26Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
27`event.ingested` to @timestamp.
28For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
29"""
30severity = "medium"
31tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Persistence", "Tactic: Privilege Escalation", "Data Source: Elastic Endgame", "Data Source: Elastic Defend", "Data Source: Sysmon"]
32timestamp_override = "event.ingested"
33type = "eql"
34
35query = '''
36registry where host.os.type == "windows" and
37/* uncomment once stable length(bytes_written_string) > 0 and */
38  registry.path : (
39    "HKLM\\SYSTEM\\*ControlSet*\\Control\\Session Manager\\AppCertDLLs\\*",
40    "\\REGISTRY\\MACHINE\\SYSTEM\\*ControlSet*\\Control\\Session Manager\\AppCertDLLs\\*"
41  )
42'''
43
44
45[[rule.threat]]
46framework = "MITRE ATT&CK"
47[[rule.threat.technique]]
48id = "T1546"
49name = "Event Triggered Execution"
50reference = "https://attack.mitre.org/techniques/T1546/"
51[[rule.threat.technique.subtechnique]]
52id = "T1546.009"
53name = "AppCert DLLs"
54reference = "https://attack.mitre.org/techniques/T1546/009/"
55
56
57
58[rule.threat.tactic]
59id = "TA0003"
60name = "Persistence"
61reference = "https://attack.mitre.org/tactics/TA0003/"
62
63[[rule.threat]]
64framework = "MITRE ATT&CK"
65[[rule.threat.technique]]
66id = "T1546"
67name = "Event Triggered Execution"
68reference = "https://attack.mitre.org/techniques/T1546/"
69[[rule.threat.technique.subtechnique]]
70id = "T1546.009"
71name = "AppCert DLLs"
72reference = "https://attack.mitre.org/techniques/T1546/009/"
73
74
75
76[rule.threat.tactic]
77id = "TA0004"
78name = "Privilege Escalation"
79reference = "https://attack.mitre.org/tactics/TA0004/"