The document discusses the Storm worm, which first emerged in 2007 and uses a peer-to-peer network and rootkit technology to spread and avoid detection. It spreads through email and phishing websites. As it has evolved, Storm can send spam, conduct DDoS attacks, and download files. It uses a decentralized P2P architecture and encrypts traffic between bots using XOR encryption, making it difficult to trace. The rootkit technology allows it to hide processes, files, ports, and services to avoid detection by anti-virus software. Analysis of Storm's P2P network revealed over 5,796 infected hosts communicating within 21 minutes.