WinNuke

The term WinNuke refers to a remote denial-of-service attack (DoS) that affected the Microsoft Windows 95, Microsoft Windows NT and Microsoft Windows 3.1x computer operating systems. The exploit sent a string of OOB (out of band) data to the target computer on TCP port 139 (NetBIOS), causing it to lock up and display a Blue Screen of Death. This doesn't damage or change the data on the computer's hard disk, but any unsaved data would be lost.