sigma-rules/rules/windows/persistence_appinitdlls_registry.toml

[metadata]
creation_date = "2020/11/18"
maturity = "production"
updated_date = "2020/11/18"

[rule]
author = ["Elastic"]
description = """
Attackers may maintain persistence by creating registry keys using AppInit DLLs. AppInit DLLs are loaded by every process
using the common library, user32.dll.
"""
index = ["winlogbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License"
name = "Registry Persistence via AppInit DLL"
risk_score = 47
rule_id = "d0e159cf-73e9-40d1-a9ed-077e3158a855"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
type = "eql"

query = '''
registry where
   registry.path : ("HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\AppInit_Dlls", 
                    "HKLM\\SOFTWARE\\Wow6432Node\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\AppInit_Dlls") and
   not process.executable : ("C:\\Windows\\System32\\msiexec.exe", 
                             "C:\\Windows\\SysWOW64\\msiexec.exe", 
                             "C:\\Program Files\\Commvault\\ContentStore*\\Base\\cvd.exe",
                             "C:\\Program Files (x86)\\Commvault\\ContentStore*\\Base\\cvd.exe")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1103"
name = "AppInit DLLs"
reference = "https://attack.mitre.org/techniques/T1103/"


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