Infected USB shuts down London council

How much damage can ONE infected USB flash-drive do? If it's infected with Conficker-D and your IT systems are not appropriately maintained and patched (council was still running Windows 2000, requested an update to Windows XP). In addition to being out of commission for a week, "further shutdowns followed when the network was reinfected twice in the next week, and all terminals had to be rebuilt or replaced."

Src: Computer virus cripples council’s work for weeks | News
Src: Conficker borks London council | TheRegister
Src: Ealing Council facing £501,000 fine after its network was hit by a virus that crippled it for weeks | SC Magazine

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