The cyber attack on the systems of the US Investigation Services (USIS), a company running background checks for employees of the US Department of Homeland Security (DHS), exposed details of 25,000 US government workers, according to Reuters.The incident was reported at the beginning of the month, and it is believed that behind it there are actors supported by a foreign government; the incident has all the markings of a state-sponsored attack, forensic investigators say.Reuters i…