Four days ago I noticed a lot of "undeliverable" e-mails suddenly being sent to my spam folder and Inbox in Yahoo Mail. I have a paid account with Yahoo Mail. I immediately thought my Yahoo Contact list had been compromised, and that is what happened. All my contacts received a link to a site that wants to sell Viagra. Very embarrassing.
I immediately changed my password and logged off and back on to Yahoo Mail. I haven't seen a problem since. But how do I know I don't have some trojan or worm in my computer? I still may be at risk.
Here are my questions that linger:
* Does this mean they got my password?
* Or could I have opened some spam message and started some trojan or worm? I check my spam folder daily and never have more than about 12 spams in my spam folder at any one time. Sometimes I open a spam message if I think it may be from a friend or a company I deal with, but I never click any links in the message or open any attachments.
* How do I prevent this from happening again?
Here is what I'd like to do: How do I check my computer so that I can be sure I don't have some trojan or worm? I assume it would include running ComboFix or something similar, but I will wait for instructions before I do anything at all. Thank you.
Windows 7 Home Premium Version 6.1.7600 Build 7600
Dell laptop Studio 1555
x64-based PC Pentium Dual-Core CPU. T4400 @ 2.20 ghz, 2200 mhz, 2 Cores.
McAfee Security Center
3 GB RAM
Edited by Capour, 16 November 2010 - 10:30 PM.