[metadata]
creation_date = "2024/05/29"
integration = ["endpoint", "windows"]
maturity = "production"
updated_date = "2024/10/17"
min_stack_version = "8.14.0"
min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."

[rule]
author = ["Elastic"]
description = """
Identifies unusual DLLs loaded by the DNS Server process, potentially indicating the abuse of the ServerLevelPluginDll
functionality. This can lead to privilege escalation and remote code execution with SYSTEM privileges.
"""
from = "now-9m"
index = ["logs-endpoint.events.library-*", "logs-windows.sysmon_operational-*", "winlogbeat-*"]
language = "eql"
license = "Elastic License v2"
name = "Unsigned DLL loaded by DNS Service"
references = [
    "https://cube0x0.github.io/Pocing-Beyond-DA/",
    "https://adsecurity.org/?p=4064",
    "https://github.com/gtworek/PSBits/tree/master/ServerLevelPluginDll"
]
risk_score = 47
rule_id = "5d676480-9655-4507-adc6-4eec311efff8"
severity = "medium"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Privilege Escalation",
    "Data Source: Elastic Defend",
    "Data Source: Sysmon"
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
any where host.os.type == "windows" and event.category : ("library", "process") and
  event.type : ("start", "change") and event.action : ("load", "Image loaded*") and
  process.executable : "?:\\windows\\system32\\dns.exe" and 
  not ?dll.code_signature.trusted == true and
  not file.code_signature.status == "Valid"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1068"
name = "Exploitation for Privilege Escalation"
reference = "https://attack.mitre.org/techniques/T1068/"


[rule.threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"