Worst Computer Virus 10: Melissa
Worst Computer Virus 9: ILOVEYOU
Worst Computer Virus 8: The Klez Virus
Worst Computer Virus 7: Code Red and Code Red II
Worst Computer Virus 6: Nimda
Worst Computer Virus 5: SQL Slammer/Sapphire
Worst Computer Virus 4: MyDoom
Worst Computer Virus 3: Sasser and Netsky
Worst Computer Virus 2: Leap-A/Oompa-A
Worst Computer Virus 1: Storm Worm
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The CIH virus in 1998
Estimated Damage: $20 to $80 million worldwide; countless amounts of PC data destroyed
Melissa in 1999
Estimated Damage: $1 billion
Melissa spread through Microsoft Word 97 and Word 2000.
ILOVEYOU in 2000
Estimated Damage: $5.5 billion to $8.7 billion in damages; ten percent of all Internet-connected computers hit
Code Red in 2001
Estimated Damage: Code Red and Code Red II are two worms with damages estimated at $2 billion; a rate of $200 million in damages per day
SQL Slammer in 2003
Estimated Damage: shut down South Korea's online capacity for 12 hours; affected 500,000 servers worldwide
MSBlast in 2003
Estimated Damage: between $2 and $10 billion; hundreds of thousands of infected PCs
Sobig in 2003
Estimated Damage: 500,000 computers worldwide; as much as $1 billion in lost productivity
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