查明这些袭击的罪犯，几乎是不可能的，因为网络攻击通常会通过多层被感染的计算机进入，以掩盖其发起源头。
Identifying the culprits in such attacks can be next to impossible, because computer attacks are typically routed through multiple layers of infected computers to disguise the source.
一旦被感染，该软件（中毒计算机）每天会连接250个不同的随机域名。
Once it has infected a machine, the software also tries to connect to up to 250 different domains with random names every day.
网站现在成了受黑客青睐的传播恶意软件的工具，部分原因是通过社交媒体网站发送垃圾邮件或链接可以让计算机神不知鬼不觉地被感染。
Websites are now the favoured means of spreading malware, partly because the unwary are directed to them through spam or links posted on social-networking sites.
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