Police dismantled a botnet that controlled millions of computers.
Tips
memory
Direct calque of English "botnet". 僵尸 means "zombie" (in Chinese folklore, a stiff hopping corpse), here used in the IT sense — a machine that does the master's bidding without its owner's knowledge.
culture
The Chinese 僵尸 is its own folkloric creature distinct from Western zombies — a 清-dynasty stiff-jointed hopping corpse, popularized worldwide by the Mr. Vampire (僵尸先生) HK film series. The IT sense is purely a 1990s loan.