If you suspect your PC has been infected by a rogue KMS activator:

The MS Office 2013 KMS Activator is a tool designed to activate Microsoft Office 2013 installations without requiring a valid product key or subscription. KMS (Key Management Service) is a legitimate activation method developed by Microsoft, which allows organizations to activate their Office installations using a KMS host. However, the MS Office 2013 KMS Activator is a third-party tool that mimics the KMS activation process, allowing users to activate their Office 2013 installations without the need for a genuine product key.

Crackers know that people searching for "free activation" have lowered security defenses. According to cybersecurity reports (e.g., from Sophos or Malwarebytes), over 60% of KMS activators downloaded from torrent sites or file-hosting services contain:

Because the KMS emulator relies on scheduled tasks, a Windows system update (e.g., KB5026415) often breaks the hack. Your Office 2013 will suddenly revert to "Unlicensed Product" and disable editing features. Worse, some activators corrupt the Windows Registry, leading to Blue Screens of Death (BSOD) or broken system restore points.