I thought I would warn any Yahoo mail users of a very nasty virus that is sweeping its system. I’m not sure this has been covered in other posts, but I will post it anyway in the hope it helps someone here.
Yesterday I got a phone text message from a friend who said the mail I sent him had an attachment he could not open. I was surprised as I had not written to him for weeks, and I have never sent him an attachment.
I checked my mail box and sent items when I got home and found that although my sent box showed nothing sent, I had sent mails to almost everyone in the address book…
I have more that one Yahoo account, for different car groups and so on, and checked these. Yep, some of these had done the same.

I asked my girl friend to check her Yahoo accounts, and two of hers were hacked and have done the same thing sending out mails.
None of my or her mail accounts were connected by contact lists, or even between our own accounts.
I checked on line and found that Yahoo mail has a serious problem.
Your mail box is hacked, and your contact or address list is plundered. The virus then mails everyone it can (including your account it cane from!) with a blank letter and an attachment.
This mail you receive could be in your name or one of your contacts. It can even be from someone you have once sent or received a mail from, and does not necessarily have to be from someone in your contact/address book.
Once you open the attachment it can releases a virus that can cause your mail box or computer to become infected.
One clue is that you may receive a (up till now) blank mail from a lot of contacts together, in a form of group email. This will be the same as the mail 'you sent out' without knowing it. It will have an attachment with it.
It started in America in late January and is now spreading to Britain. It appears to originate in India (where Yahoo farms out for cheap labour, ironic isn’t it as this could cost Yahoo dear...), and frozen mail box users in the US (who opened the attachment) received a mail containing notification that they are hacked, and also a telephone number to call to fix it. Once called, people with ‘poor spoken English’ offered an option to have the accounts restored for $100. No doubt you needed to pass over your bank details for this, and end up having your whole bank account emptied.
A video was posted on Youtube by an Indian IT worker, three weeks before this, and showed how easy it was to hack into Yahoo mail accounts, and hundreds of thousands of scammers had seen the video before it was removed.
It has now progressed into pointless hacking for fun, as well as for fraud. Sometimes its advertising, sometimes it is abusive, sometimes it’s a virus that destroys your mail account and there are even reports of damaging your PC.
I warn anyone who has received a blank letter with an attachment appearing in their inbox to delete it ASAP, EVEN IF IT IS FROM SOMEONE YOU KNOW, as that is the whole point of plundering and using your contacts or names of people you trust.
This virus will spread to other mail addresses, such as Google, and as one computer is much the same as another, a virus opened via the attachment could take over your mail box or damage your PC.
I hope this makes sense. Please reply if you don’t understand and I will go over it again.
Simply, never, never open attachments that you are not expecting in your mail. If it is not accompanied with a letter that you KNOW is from someone you trust, DELETE IT.