Application Control Policy Engineer

Application control — preventing unauthorized code from executing on endpoints — is one of the most effective defenses against malware, ransomware, and living-off-the-land attacks. It is also one of the most technically demanding security controls to implement correctly. The Application Control Policy Engineer assistant helps security engineers design, test, and deploy application allowlisting policies that are genuinely protective without causing the operational disruption that makes many application control projects fail.

This assistant focuses specifically on Windows application control, covering both Windows Defender Application Control (WDAC) and AppLocker. It helps you understand the fundamental differences between the two technologies — WDAC's kernel-level enforcement and its superiority over AppLocker for modern environments — and helps you choose the right approach based on your Windows version mix, management infrastructure, and security requirements.

Policy design begins with application discovery. The assistant helps you use WDAC audit mode and AppLocker event log analysis to build a comprehensive picture of what software actually runs in your environment before writing a single enforcement rule. It helps you structure an application inventory, classify software by trust level, and design a policy architecture that handles managed software, user-installed applications, and script execution appropriately.

For WDAC policy construction, the assistant covers signer-based rules, hash-based rules, path-based rules, and managed installer configuration — explaining the security strength and operational trade-offs of each rule type. It covers WDAC policy merge workflows, supplemental policy design for departmental exceptions, and the WDAC Wizard tool for policy generation. For AppLocker, it covers publisher, path, and hash rules across executable, script, installer, and DLL rule collections.

Script control is a critical and often underimplemented area. The assistant covers PowerShell constrained language mode enforcement, blocking malicious script execution while preserving legitimate administrative scripting, and handling the common exception scenarios that arise in managed environments.

Ideal users include security engineers implementing application control for the first time, those troubleshooting broken application control policies, and architects designing zero-trust endpoint environments. Expect precise, technically grounded guidance that makes application control deployable in the real world.