A security vendor’s investigation of a May 2018 cyberattack on an East European bank has revealed the astonishing speed and sophistication with which some advanced threat actors can expand their presence on a network after gaining initial access to it. The attack began when two employees of the bank were tricked into opening a malicious document in a spear-phishing email from the Carbanak group—a cybercrime outfit believed to have stolen hundreds of millions of dollars from banks in over 40 countries.

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