“Russia is behind a spearphishing attack that forced the Pentagon to shut down its Joint Staff unclassified email system, NBC News is reporting. The hack, which took place around July 25, affected approximately 4,000 military and civilian personnel, NBC News reported. The news outlet cited U.S. officials who called the intrusion a ‘sophisticated cyberattack.'”
Source: Reports: Russia Hacked Pentagon’s Joint Staff Email – Nextgov.com