I saw this morning two delivery failure messages from Yahoo showing someone or something tried to send spam to my contacts in Yahoo. Upon investigation I noticed that it also deleted two years worth of messages in my sent folder. I've since changed my password and security questions and cleared the cache on my browser. I also immediately ran a MBAM and SAS scan and both found nothing. I didn't delete the failure messages which include headers for the original spam emails, so I can provide headers upon request.
Recently, I received a spam email from a contact (who also uses Yahoo) so I imagine the two may be related. I've read from a few users that Yahoo servers may have experienced an intrusion, but I want to make sure I don't have an infection or rootkit. Thanks in advance.
(I'm running Windows 7).
Edited by jajacks, 14 August 2010 - 12:53 PM.