Zombies
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Definition
A zombie computer, often referred to as a zombie, is a computer that is connected to the Internet and has been compromised by a hacker, worm, trojan, or some other form of malware. Zombies are typically only one of many other infected computers in the zombie "horde," also known as a "botnet." These infected computers execute commands that are issued remotely from a botnet command & control server to perform malicious tasks. Most of the time, users of these zombie computers are unaware that their system is compromised and may be linked to illegal activities, hence the metaphor of a brain-dead zombie.
Exploitation
Computers are compromised by bot herders via various methods, such as, drive-by browser exploits or tricking the user into running a malformed program. However, like anything in the hacker world, there is no general rule for how one is infected. Botnets are typically controlled via IRC, however, they have also been controlled via Instant Message and Twitter. The most common place for these infected programs is in the "warez" scene.
Types of Attacks
There are many ways a malicious hacker can benefit from a botnet. Botnets are commonly used to send spam e-mail, commit pay-per-click fraud, and launch distributed denial-of-service attacks.
