From December 2018 until at least May of this year, the GRU hacker group known as APT28 or Fancy Bear carried out a broad hacking campaign against US targets, according to an FBI notification sent to victims of the breaches in May and obtained by WIRED. According to the FBI, the GRU hackers primarily attempted to break into victims’ mail servers, Microsoft Office 365 and email accounts, and VPN servers.

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