Potential Enumeration via Active Directory Web Service

 1[metadata]
 2creation_date = "2024/01/31"
 3integration = ["endpoint"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/04/08"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies processes loading Active Directory related modules followed by a network connection to the ADWS dedicated TCP port. 
13Adversaries may abuse the ADWS Windows service that allows Active Directory to be queried via this web service.
14"""
15from = "now-9m"
16index = ["logs-endpoint.events.library-*", "logs-endpoint.events.network-*"]
17language = "eql"
18license = "Elastic License v2"
19name = "Potential Enumeration via Active Directory Web Service"
20references = ["https://github.com/FalconForceTeam/SOAPHound"]
21risk_score = 47
22rule_id = "9c951837-7d13-4b0c-be7a-f346623c8795"
23severity = "medium"
24tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Discovery", "Data Source: Elastic Defend"]
25timestamp_override = "event.ingested"
26type = "eql"
27
28query = '''
29sequence by process.entity_id with maxspan=3m
30 [library where host.os.type == "windows" and 
31  dll.name : ("System.DirectoryServices*.dll", "System.IdentityModel*.dll") and 
32  not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and 
33  not process.executable : 
34                ("?:\\windows\\system32\\dsac.exe", 
35                 "?:\\program files\\powershell\\?\\pwsh.exe", 
36                 "?:\\windows\\system32\\windowspowershell\\*.exe", 
37                 "?:\\windows\\syswow64\\windowspowershell\\*.exe", 
38                 "?:\\program files\\microsoft monitoring agent\\*.exe", 
39                 "?:\\windows\\adws\\microsoft.activedirectory.webservices.exe")]
40 [network where host.os.type == "windows" and destination.port == 9389 and source.port >= 49152 and
41  network.direction == "egress" and network.transport == "tcp" and not cidrmatch(destination.ip, "127.0.0.0/8", "::1/128")]
42'''
43
44[[rule.threat]]
45framework = "MITRE ATT&CK"
46
47[[rule.threat.technique]]
48id = "T1018"
49name = "Remote System Discovery"
50reference = "https://attack.mitre.org/techniques/T1018/"
51
52[rule.threat.tactic]
53id = "TA0007"
54name = "Discovery"
55reference = "https://attack.mitre.org/tactics/TA0007/"