A Registry Run key is a Windows autostart location that tells the system to launch a program when a user logs on. Attackers value it because it provides persistence: once a malicious executable or script is added to a Run key, it can restart after reboots and user sign-ins without needing another infection step.
In real attacks, Run keys often point to a hidden loader, a PowerShell command, or a dropped payload that keeps the intruder active. Defenders watch these entries closely because they are common targets for abuse and easy to inspect with endpoint tools or registry auditing. Unexpected changes, especially under HKCU or HKLM Run paths, can reveal persistence from malware, loaders, or remote access tools. Removing the value and the underlying file is usually required to fully evict the threat.