Effect of Worm
Once Witty infects a computer by exploiting a vulnerability in the ISS software packages (RealSecure Network, RealSecure Server Sensor, RealSecure Desktop, and BlackICE), it attempts to infect other computers using the same vulnerability.
Witty launches these attacks as fast as possible, attacking a pseudo-random subset of IP addresses as quickly as allowed by the computer's Internet connection. It repeats these attacks in groups of 20,000, alternately launching attacks and overwriting sections of the computer's hard disk(s).
Read more about this topic: Witty (computer Worm)
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