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I talked to someone today who had an interesting issue: After clicking on a link in his Yahoo mailbox, all persons in his address book got spam from him.

What happened? Has his computer been hacked or did the attacker steal the cookie and got into his mail account? Any related articles I could read?

What should this person do now?

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closed as off topic by Wuffers, Shinrai, ChrisF, slhck, Phoshi May 13 '11 at 21:55

Questions on Super User are expected to relate to computer software or computer hardware within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Questions on Super User are generally related to computer hardware/software in some way. This isn't related to either and is therefore off topic. –  Wuffers May 13 '11 at 21:44
@MarkSzymanski: Agreed. Flagging for moderator to close. –  DragonLord May 13 '11 at 21:46
How is getting a webmail account cracked not computer related? –  Aaron Digulla May 14 '11 at 9:10
it is not about ... websites or web services like Facebook, Twitter, and WordPress - FAQ. You can try asking at Web Apps –  Sathya May 15 '11 at 9:59
@Sathya: Web Apps would probably reply that the attack probably exploited a browser bug or tricked the user into installing something on their computer, so the question belongs on SU. Also, ensuing meta.SO question. –  Gilles May 15 '11 at 10:31