credential_access_persistence_network_logon_provider_modification.toml

[metadata]
creation_date = "2021/03/18"
maturity = "production"
updated_date = "2022/02/28"

[rule]
author = ["Elastic"]
description = """
Identifies the modification of the network logon provider registry. Adversaries may register a rogue network logon
provider module for persistence and/or credential access via intercepting the authentication credentials in clear text
during user logon.
"""
false_positives = ["Authorized third party network logon providers."]
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Network Logon Provider Registry Modification"
references = [
    "https://github.com/gtworek/PSBits/tree/master/PasswordStealing/NPPSpy",
    "https://docs.microsoft.com/en-us/windows/win32/api/npapi/nf-npapi-nplogonnotify",
]
risk_score = 47
rule_id = "54c3d186-0461-4dc3-9b33-2dc5c7473936"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence", "Credential Access"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where registry.data.strings != null and
 registry.path : "HKLM\\SYSTEM\\*ControlSet*\\Services\\*\\NetworkProvider\\ProviderPath" and
 /* Excluding default NetworkProviders RDPNP, LanmanWorkstation and webclient. */
 not ( user.id : "S-1-5-18" and
       registry.data.strings in
                ("%SystemRoot%\\System32\\ntlanman.dll",
                 "%SystemRoot%\\System32\\drprov.dll",
                 "%SystemRoot%\\System32\\davclnt.dll")
      )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1556"
name = "Modify Authentication Process"
reference = "https://attack.mitre.org/techniques/T1556/"


[rule.threat.tactic]
id = "TA0006"
name = "Credential Access"
reference = "https://attack.mitre.org/tactics/TA0006/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1543"
name = "Create or Modify System Process"
reference = "https://attack.mitre.org/techniques/T1543/"


[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"