Execution via local SxS Shared Module

 1[metadata]
 2creation_date = "2020/10/28"
 3integration = ["endpoint", "windows"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2023/06/22"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies the creation, change, or deletion of a DLL module within a Windows SxS local folder. Adversaries may abuse
13shared modules to execute malicious payloads by instructing the Windows module loader to load DLLs from arbitrary local
14paths.
15"""
16from = "now-9m"
17index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*"]
18language = "eql"
19license = "Elastic License v2"
20name = "Execution via local SxS Shared Module"
21note = """## Triage and analysis
22
23The SxS DotLocal folder is a legitimate feature that can be abused to hijack standard modules loading order by forcing an executable on the same application.exe.local folder to load a malicious DLL module from the same directory.
24
25## Setup
26
27If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
28"""
29references = ["https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-redirection"]
30risk_score = 47
31rule_id = "a3ea12f3-0d4e-4667-8b44-4230c63f3c75"
32severity = "medium"
33tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
34timestamp_override = "event.ingested"
35type = "eql"
36
37query = '''
38file where host.os.type == "windows" and file.extension : "dll" and file.path : "C:\\*\\*.exe.local\\*.dll"
39'''
40
41
42[[rule.threat]]
43framework = "MITRE ATT&CK"
44[[rule.threat.technique]]
45id = "T1129"
46name = "Shared Modules"
47reference = "https://attack.mitre.org/techniques/T1129/"
48
49
50[rule.threat.tactic]
51id = "TA0002"
52name = "Execution"
53reference = "https://attack.mitre.org/tactics/TA0002/"