Re: top ten list of viruses ever!!!

From: Robert Moir (robspamtrap+msnews_at_gmail.com)
Date: 07/03/05 

Date: Sun, 3 Jul 2005 16:46:13 +0100

Help wrote:
> 1. W32/MyDoom.A-mm (62M)
> 2. W32/Sobig.F-mm (35M)
> 3. W32/Netsky.B-mm (9M)
> 4. W32/NetSky.D-mm (9M)
> 5. W32/Klez.H-mm (8M)
> 6. W32/Swen.A-mm (5M)
> 7. W32/Netsky.P-mm (4M)
> 8. W32/Netsky.C-mm (3M)
> 9. W32/Yaha.E-mm (2M)
> 10. W32/Dumaru.A-mm (2M)

based on what?