Botnet master hits the kill switch, takes down 100,000 PCs
"Botnets aren't just dangerous because they can steal massive amounts of personal data and launch denial-of-service attacks—they can also self-destruct, leaving the owners of affected machines in the dust. The controllers of one such botnet recently hit the kill switch for one reason or another, taking down some 100,000 infected computers with it.
(...) But Zeus had another interesting feature—one that isn't terribly uncommon among botnet software, it turns out. A command was built into the software to kos—or "kill operating system"—and it was apparently executed some time last month.
The reason for BSODing 100,000 machines isn't quite clear, but several security experts have offered up their opinions. S21sec wrote on its blog that those behind Zeus might have wanted more time to exploit the financial data they had harvested by removing the user's ability to get online and see that money was being transferred. On the other hand, (...) "Maybe the botnet was hijacked by another crime group," Hüssy told the Post. Or, he postulated, perhaps those behind Zeus were just dumb. (...)"