A diagram of the process by which spammers use zombie (virus-infected) computers to send spam.

1. Virus writer sends out viruses, infecting ordinary users' Windows PCs.
2. Infected PCs log into an IRC server or other communications medium, forming a network of infected systems known as a botnet.
3. Spammer purchases access to this botnet from virus writer or a dealer.
4. Spammer sends instructions to the botnet, instructing the infected PCs to send out spam.
5. The infected PCs send the spam messages to Internet users' mail servers.

Diagram created in NeoOffice/J on Mac OS X, 11 June 2005. --FOo 16:51, 11 Jun 2005 (UTC)

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Original upload log

• 10:19, 12 May 2006 . . Drat (Talk | contribs) . . 745×902 (83,139 bytes) (Optimised with OptiPNG.)
• 12:16, 1 May 2006 . . Carpathia (Talk | contribs) . . 745×902 (91,803 bytes) (Reverted to earlier revision)
• 12:14, 1 May 2006 . . Carpathia (Talk | contribs) . . 767×977 (126,447 bytes) (Reverted to earlier revision)
• 02:06, 1 August 2005 . . DominicC13 (Talk | contribs) . . 745×902 (91,803 bytes) (Reverted to earlier revision)
• 02:05, 1 August 2005 . . DominicC13 (Talk | contribs) . . 767×977 (126,447 bytes) (Reverted to earlier revision)
• 17:04, 11 June 2005 . . Fubar Obfusco (Talk | contribs) . . 745×902 (91,803 bytes) (New version with trimmed margins ...)
• 16:51, 11 June 2005 . . Fubar Obfusco (Talk | contribs) . . 767×977 (126,447 bytes) ({{GFDL}} A diagram of the process by which spammers use zombie (virus-infected) computers to send spam. 1. Virus writer sends out viruses, infecting ordinary users' Windows PCs. 2. Infected PCs log into an IRC server or other communications medium, for)