Microsoft IIS Service Account Password Dumped

Identifies the Internet Information Services (IIS) command-line tool, AppCmd, being used to list passwords. An attacker with IIS web server access via a web shell can decrypt and dump the IIS AppPool service account password using AppCmd.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2020/08/18"
 3integration = ["endpoint", "windows", "system"]
 4maturity = "production"
 5min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 6min_stack_version = "8.3.0"
 7updated_date = "2024/01/16"
 8
 9[rule]
10author = ["Elastic"]
11description = """
12Identifies the Internet Information Services (IIS) command-line tool, AppCmd, being used to list passwords. An attacker
13with IIS web server access via a web shell can decrypt and dump the IIS AppPool service account password using AppCmd.
14"""
15from = "now-9m"
16index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*", "logs-system.security*"]
17language = "eql"
18license = "Elastic License v2"
19max_signals = 33
20name = "Microsoft IIS Service Account Password Dumped"
21references = ["https://blog.netspi.com/decrypting-iis-passwords-to-break-out-of-the-dmz-part-1/"]
22risk_score = 73
23rule_id = "0564fb9d-90b9-4234-a411-82a546dc1343"
24setup = """
25
26If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
27events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
28Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
29`event.ingested` to @timestamp.
30For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
31"""
32severity = "high"
33tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Credential Access", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
34timestamp_override = "event.ingested"
35type = "eql"
36
37query = '''
38process where host.os.type == "windows" and event.type == "start" and
39   (process.name : "appcmd.exe" or ?process.pe.original_file_name == "appcmd.exe") and
40   process.args : "/list" and process.args : "/text*password"
41'''
42
43
44[[rule.threat]]
45framework = "MITRE ATT&CK"
46[[rule.threat.technique]]
47id = "T1003"
48name = "OS Credential Dumping"
49reference = "https://attack.mitre.org/techniques/T1003/"
50
51
52[rule.threat.tactic]
53id = "TA0006"
54name = "Credential Access"
55reference = "https://attack.mitre.org/tactics/TA0006/"

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