Two of them, David-Manuel Santos Da Silva and Giang Hoang Vu, are in custody, the latter pleading guilty on February 5, 2015, to conspiracy to commit computer fraud.
28-year-old Viet Quoc Nguyen (indictment document) from Vietnam is yet to be located and apprehended. He is accused of hacking the ESPs and stealing the email addresses. Together with Vu, 25, he delivered the spam content to millions of recipients.
Read it here.