Scam victimizes an estimated 3.3 million people and rakes in $1.5 billion annually. The classic tactic involves cold calls — unsolicited telephone calls — where callers pose as computer support technicians. The files in “My Documents” folder were actually two dozen pieces of malware of various stripes. “I took a page out of the hacker’s book of tricks and simply renamed documents to make them tastier,” a victim says. The call went like clock, with the usual instructions to do this or look there was passed from fake technician.”]