A Bot is often called a zombie because it is a compromised computer controlled by malware without the consent and knowledge of the user.
A Botnet is a network of bots controlled by a Bot Master
It is a key platform for fraud and other for-profit exploits.
Traditional Anti-Virus Tools, Traditional IDS/IPS, Honeypot
Bots are stealthy on the infected machines
Bot infection is usually a multi-faceted and multi-phased process
Bot are dynamically evolving
Botnets can have very flexible design of C&C channels
Recursive DNS Monitoring at ISP
Analyze DNS traffic from internal hosts to a recursive DNS server of the network