First unix worm - November 2, 1988
system specific: ran on vaxbsd, sun3
exploited bugs and sloppiness: bugs in sendmail (debug mode) and finger (buffer overflow) + gullibility (passwordless rsh)
replicated and spread itself to neighboring systems
lead to denial of service: bugs made it more efficient than intended; possibly one of the earliest DOSes recorded
estimated to have reached (and used) 10% of the internet - 6,000 hosts
Made Unixers aware of the problem