Criminals have launched a major e-mail campaign to deploy the infamous ZeuS Trojan. The fake IRS e-mails arrive with the tried-and-true subject line Notice of Underreported Income and encourage the recipient to click a link to review their tax statement. The latest attack appears to be an extension of a broad malware spam campaign that began at the end of May. Only three out of 40 different anti-virus products detected the file as malicious, yet none of those currently identify it for what it is.”]
Source: https://krebsonsecurity.com/2010/06/zeus-trojan-attack-spoofs-irs-twitter-youtube/