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[New Rule] Potential Forced Authentication - SMB Named Pipes #3916

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74 changes: 74 additions & 0 deletions rules/windows/credential_access_forced_authentication_pipes.toml
Original file line number Diff line number Diff line change
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[metadata]
creation_date = "2024/07/23"
integration = ["system", "windows"]
maturity = "production"
updated_date = "2024/07/23"

[rule]
author = ["Elastic"]
description = """
Identifies a potential forced authentication using related SMB named pipes. Attackers may attempt to force targets to
authenticate to a host controlled by them to capture hashes or enable relay attacks.
"""
from = "now-9m"
index = ["logs-system.security-*", "logs-windows.forwarded-*"]
language = "eql"
license = "Elastic License v2"
name = "Potential Forced Authentication - SMB Named Pipes"
references = [
"https://github.com/p0dalirius/windows-coerced-authentication-methods",
"https://www.thehacker.recipes/a-d/movement/mitm-and-coerced-authentications",
"https://attack.mitre.org/techniques/T1187/",
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Do we need MITRE URL as ref if mapped already?

]
risk_score = 21
rule_id = "73d05fd0-d73b-4625-aa2e-3221965aa2e3"
setup = """## Setup

The 'Audit Detailed File Share' audit policy must be configured (Success Failure).
Steps to implement the logging policy with Advanced Audit Configuration:

```
Computer Configuration >
Policies >
Windows Settings >
Security Settings >
Advanced Audit Policies Configuration >
Audit Policies >
Object Access >
Audit Detailed File Share (Success,Failure)
```
"""
severity = "low"
tags = [
"Domain: Endpoint",
"OS: Windows",
"Use Case: Threat Detection",
"Tactic: Credential Access",
"Data Source: Elastic Defend",
"Data Source: Active Directory",
"Use Case: Active Directory Monitoring",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
sequence by host.id, source.ip, user.name with maxspan=1s
[authentication where host.os.type == "windows" and event.action == "logged-in" and
winlog.event_data.AuthenticationPackageName : "NTLM" and winlog.event_data.SubjectUserSid == "S-1-0-0"]
[file where host.os.type == "windows" and event.code == "5145" and file.name : ("Spoolss", "netdfs", "lsarpc", "lsass", "netlogon", "samr", "efsrpc", "FssagentRpc")]
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Had some unrelated hits in the lsarpc pipe, will measure the noise as this one is used in EFSRPC related forced auth, and will remove it and create a BBR if the volume is too high

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lsarpc, lsass, spoolss, netlogon and samr are all very frequent and risk to be very noisy, I would suggest to use a new term rule type and limit to the 5145 event (no need for a sequence with logon event) and use 3 terms user.name, source.ip, host.id and file.name limited to spoolss, "efsrpc", "FssagentRpc" and "netdfs".

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Thanks! I'll work on that

'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1187"
name = "Forced Authentication"
reference = "https://attack.mitre.org/techniques/T1187/"


[rule.threat.tactic]
id = "TA0006"
name = "Credential Access"
reference = "https://attack.mitre.org/tactics/TA0006/"

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