Security analysts tracking the breaches, meanwhile, have found a range of victims across nearly every industry – starting with telecoms and outsourcing firms to healthcare and financial service companies. FBI officials first began looking at the hackers' operations more than a year ago. The sources say that, following the September casino hacks, the FBI's investigation took on new urgency. Some have been collecting evidence leading to the hackers' identities and are assisting law enforcement, according to the five insiders. Neither company responded to a request for comment.ĬrowdStrike, Alphabet's Mandiant, Palo Alto Networks, and Microsoft are among the main American cybersecurity firms responding to private company breaches by the hackers.
