# Source: https://docs.datadoghq.com/security/default_rules/def-000-zzb.md

---
title: Windows known DLLs registry key modified
description: Datadog, the leading service for cloud-scale monitoring.
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# Windows known DLLs registry key modified
Classification:attackTactic:[TA0005-defense-evasion](https://attack.mitre.org/tactics/TA0005)Technique:[T1112-modify-registry](https://attack.mitre.org/techniques/T1112) 
## What happened{% #what-happened %}

`{{ @process.executable.name }}` modified the known DLLs registry key `{{ @registry.key_name }}`.

## Goal{% #goal %}

Detect modifications of the Windows known DLLs registry key.

## Strategy{% #strategy %}

Various compliance frameworks, including PCI DSS, SOC, and CIS, require monitoring of critical system and configuration files. Microsoft recommends the monitoring of the known DLLs registry key located at 'HKEY_LOCAL_MACHINE\CurrentControlSet\Control\Session Manager\KnownDLL' based on known attack patterns.

## Triage and response{% #triage-and-response %}

1. Identify which user or process modified the registry key.
1. If these changes were not authorized, and you cannot confirm the safety of the changes, roll back the host to an acceptable configuration.

*Requires Agent version 7.52 or later*