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This is according to Mandiants senior threat analyst Austin Larsen, Cyberscoop reports.
They successfully broke into many organizations, including Santander Bank, Ticketmaster, and many others.
Initially, it was thought that at least 165 organizations were compromised.
However, Larsen now believes mere dozens of firms were affected.
The identity of the attacker is unknown, but the truth is slowly unraveling.
ViaCyberscoop
