The word 'password' is pictured on a computer screen in this picture illustration taken in BerlinBy means of Jim Finkle and Joseph Menn BOSTON/SAN FRANCISCO (Reuters) – Activist hackers linked to the collective known as Nameless have secretly accessed U.S. govt computer systems in more than one businesses and stolen delicate data in a marketing campaign that started virtually a year in the past, the FBI warned this week. The hackers exploited a flaw in Adobe Programs Inc’s instrument to launch a rash of electronic damage-ins that commenced ultimate December, then left “back doors” to come back to a few of the machines as just lately as last month, the Federal Bureau of Investigation stated in a memo considered through Reuters. The memo, dispensed on Thursday, described the assaults as “a fashionable drawback that should be addressed.” It stated the breach affected the U.S. Army, Division of Vitality, Division of Well being and Human Services, and possibly many more businesses. Investigators are nonetheless gathering data on the scope of the cyber campaign, which the authorities consider is continuing.