The Department of Homeland Security’s Computer Emergency Readiness Team is warning Internet users to be on guard against a convincing e-mail virus scam disguised as a message from auditors at the Internal Revenue Service. According to one victim interviewed by Security Fix, falling for the ruse could cost you or your employer tens of thousand of dollars. An alert issued Monday by the U.S.-CERT states: “The attacks arrive via an unsolicited email message and may contain a subject line of ‘Notice of Underreported Income.’ These messages may contain a link or attachment. If users click on this link or open the attachment, they may be infected with malicious code, including the Zeus Trojan.” The Zeus Trojan is exceptionally good at stealing sensitive data, and it is especially interested in online banking credentials. This fake IRS/Zeus campaign has been ongoing for several weeks now, according to Gary Warner, director of research