The Washington D.C. office of the U.S. Marshals Service has approximately 400 people.

The statistics, posted online, are based on detections made by Housecall, Trend Micro's online scanner.

The U.S. Marshals Service runs Trend Micro’s OfficeScan, an anti-malware software that installs on desktops, laptops and mobile devices.

The agency, however, runs the 5.0 version, which is more than three years old. Trend Micro says protection against Neeris has been in OfficeScan since version 8. The current version is 10.

"[Their version] is a vastly out-of-date, end-of-life product," said Sweeny.