I guess you already received such mails, claiming being sent from your own email address (which are mostly not, check mail headers, then you will see it) and that the #attacker (scamming is a form of #social-engineering attack) has some "hot stuff". Most claim to have nude pictures from you being published if you don't pay, so it is also a #ransom mail.
As you already may know (or not yet), don't reply and don't buy coins and send them to it. I have traced addresses such #19rtEghbzbyBqmgJLBtUGd9VvVC1s2bKzR and #1NUFhwLSmJPnjBNyjtuFPje54UG9AH1Ruc to accounts where Bitcoins in value of 4000 to 5000 BTCs have been transferred to and from. They seem to push the (illegally obtained coins around over several accounts (I guess thousands of addresses since you can create "limitless" accounts).
Well, interesting to see how many people already falsely belief in such mails (I don't do) and that some other scare sites try to explain that these Bitcoin addresses are viruses (which they are not). If you think that sounds to weird, check your favorite search engine and enter the addresses there.