Lahey is a destructive macro virus that infects Microsoft Word documents. Once executed, the parasite installs itself to the system, lowers Microsoft Word security settings and modifies some of its components. Then it runs a destructive payload. Lahey attempts to delete text documents, Microsoft Excel workbooks, images, audio and video files, archives, executables and configuration files located in the main Windows folder. It also destroys files of the same types in the root of the main hard disk. Furthermore, the virus modifies Windows Explorer and Internet Explorer settings, disables the Registry Editor and the Task Manager, changes the system time and computer name. Lahey displays a fake error message on every Windows startup.