The Zeus botnet self-destructed after a “blue screen” attack on its PCs. Despite the blue screen, the PCs’ hard drives were not irrepairable, according to reports. It’s possible that the botnet was attacked by a rival group, or that its operators wanted to shut down the network. The Zeus network was hit with a number of DOS attacks following the triggering of the kill switch, experts say. Some experts even speculate that the kill command may have been triggered by mistake.”]
Source: https://www.darkreading.com/attacks-breaches/report-zeus-flips-kill-switch-on-more-than-100-000-pcs