Govtrip.com, which handles travel reservations for at least a dozen U.S. government agencies, last week was infected with a virus that tried to install malicious software when users visited the site, causing some agencies to block employees from accessing it, Security Fix has learned. Sometime on Feb. 11, hackers changed the Govtrip.com Web site to redirect visitors to a site that installed malicious software. A number of agencies, including the departments of Agriculture, Energy, Health & Human Services, Interior, Transportation, and Treasury, use the site exclusively to book travel arrangements. Govtrip.com also is used to reimburse workers via direct deposit, which means that many federal employees’ checking account information is stored there as well. On Thursday, Feb. 12, the Federal Aviation Administration began urging employees to avoid visiting the site. Rather, employees seeking to make travel arrangements were given instructions on how to book travel arrangements manually, FAA spokeswoman Laura