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The Morris Internet Worm (1988)
• Internet worm (Self-reproducing)
– Author Robert Morris, a first-year Cornell grad student
– Launched close of Workday on November 2, 1988
– Within a few hours of release, it consumed resources to the point of bringing down infected machines
• Techniques
– Exploited UNIX networking features (remote access)
– Bugs in finger (buffer overflow) and sendmail programs (debug mode
allowed remote login)
– Dictionary lookup-based password cracking
– Grappling hook program uploaded main worm program
LoveLetter Virus (May 2000)
• E-mail message withVBScript (simplified Visual
Basic)
• Relies on Windows Scripting
Host
– Enabled by default in
Win98/2000
• User clicks on attachment
infected!
– E-mails itself to everyone in
Outlook address book
– Replaces some files with a
copy of itself
– Searches all drives
– Downloads password
cracking program
• 60-80% of US companies
infected and 100K European
servers