![]() ![]() ![]() This practice of “1-in-7 re-infection” ensured that a user could not completely avoid a Morris Worm infection by creating a fake Morris Worm process to pretend his or her machine was already infected. ![]() If a target machine had already been infected, the Morris Worm would re-infect it 1 in 7 times. The worm spread by exploiting vulnerabilities in UNIX send mail, finger, and rsh/rexec as well as by guessing weak passwords.īefore spreading to a new machine, the Morris Worm checked if the machine had already been infected and was running a Morris Worm process. According to Morris, the purpose of the worm was to gauge the size of the precursor “Internet” of the time - ARPANET - although it unintentionally caused denial-of-service (DoS) for around 10% of the 60,000 machines connected to ARPANET in 1988. The Morris Worm was a self-replicating computer program (worm) written by Robert Tappan Morris, a student at Cornell University, and released from MIT on November 2, 1988.
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