Attackers using a novel credential phishing attack that leverages Active Directory to verify a victim’s password and gain access to an Office 365 account targeted a top financial person in a division of a large American corporation.

Once inside a victim’s account, bad actors could access sensitive financial documents, emails, calendar items and contact lists, according to an Armorblox blog post that detailed the attack.

The multifaceted attack customized a Malay language toolkit to attack an executive based in the Southwestern U.S. using a domain registered in Singapore that’s hosted in the northwest U.S. by a hosting company based out of India, said Prashanth Arun, head of data science at Armorblox.

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