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A federal agency has suffered a successful espionage-related cyberattack that led to a backdoor and multistage malware being dropped on its network. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) issued an alert on Thursday, not naming the agency but providing technical details of the attack. Hackers, it said, gained initial access by using employees’ legitimate Microsoft Office 365 log-in credentials to sign onto an agency computer remotely. “The cyber-threat actor had valid access credentials for multiple users’ Microsoft Office 365 (O365) accounts and domain administrator accounts,” according to CISA. “First, the threat actor logged into a user’s O365 account from Internet Protocol (IP) address 91.219.236[.]166 and then browsed pages on a SharePoint site and downloaded a file. The cyber-threat actor connected multiple times by Transmission Control Protocol (TCP) from IP address 185.86.151[.]223 to the victim organization’s virtual private network (VPN) server.”  As for how the attackers managed…