Similar Worms
On August 4, 2001 Code Red II appeared. Code Red II is a variant of the original Code Red worm. Although it uses the same injection vector it has a completely different payload. It pseudo-randomly chose targets on the same or different subnets as the infected machines according to a fixed probability distribution, favoring targets on its own subnet more often than not. Additionally, it used the pattern of repeating 'X' characters instead of 'N' characters to overflow the buffer.
eEye believed that the worm originated in Makati City, Philippines, the same origin as the VBS/Loveletter (aka "ILOVEYOU") worm.
Read more about this topic: Code Red (computer Worm)
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