It relied on the scripting engine being enabled.In this way the exploit could display the inner file extension 'TXT' as the real extension text files are considered to be innocuous as they can't contain executable code. Windows had begun hiding extensions by default the algorithm parsed file names from right to left, stopping at the first 'period' ('dot'). It relied on a flawed Microsoft algorithm for hiding file extensions.It relied on social engineering to entice users to open the attachment and ensure its continued propagation.Such propagation mechanism had been known (though in IBM mainframe rather than in the MS Windows environment) and used already in the Christmas Tree EXEC of 1987 which brought down a number of the world's mainframes at the time.įour aspects of the worm made it effective: It also made a number of malicious changes to the user's system. Upon opening the attachment, the worm sent a copy of itself to everyone in the Windows Address Book and with the user's sender address. The final extension was hidden by default, leading unsuspecting users to think it was a normal text file. The worm arrived e-mail on and after with the simple subject of 'ILOVEYOU' and an attachment 'LOVE-LETTER-FOR-YOU.'.

ILOVEYOU, also known as Love Letter, is a computer worm that successfully attacked tens of millions of computers in 2000 when it was sent as an attachment to a user with the text 'ILOVEYOU' in the subject line. Onel De Guzman is the creator of ILOVEYOUVIRUS

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