My gmail is spamming my contact list

So this weekend I found out my gmail account spammed my contact list about 6 times with 6 different spams messages

some of the subjects were

Subject: She will see your might!

with a link to some sex ad site or something else


Here the thing I do not get, gmail is not my primary emai, I use yahoo. I do not even remember logging into gmail over the weekend, but is possible my browser was logged in automatically, the other problem is not sure which computer it came from, my laptop or desktop.

I checked in my sent folder and my gmail account actually sent these messages, and I changed my password on gmail account in case someone hacked it.


I am running NOD32 v3, so do you think this is a virus? or malware?

why didn't NOD32 catch it? what else should I run to try to detect what is going on my machines that is sending these emails through gmail?

Thanks