Early Bird APC Injection is a stealthy code injection technique used by attackers to execute malicious code within the address space of a legitimate process. This method leverages Asynchronous Procedure Calls (APCs) and targets a process before it fully initializes, typically during its early startup phase. By queuing a malicious APC to a thread of the target process before the process begins normal execution, adversaries can evade detection by many security tools that monitor process activity only after startup. This technique is particularly effective because it allows malware to blend in with legitimate processes, making analysis and detection more difficult for endpoint protection solutions.