Endpoint execution is the moment malicious code begins running on a user’s device, such as a laptop, phone, or workstation. It is a critical phase because once code executes in the local user context, it can interact with files, browser data, processes, and network connections that are available to that session. For infostealers and other payloads, execution is often the point where the attack shifts from delivery to theft.
In real attacks, endpoint execution may be triggered by a user opening a fake installer, document, or script disguised as legitimate software. Defenders focus heavily on preventing or detecting this step because blocking execution can stop the compromise before credentials are collected or commands are launched. Controls such as application allowlisting, endpoint protection, least privilege, and monitoring for unusual installer behavior help reduce the chance that a malicious payload gets a foothold. Once execution happens, even protected browser secrets can become accessible to malware already running on the machine.