According to cyber security researchers at Votiro, this attack uses the Online Video feature in Word to take control of the computer's CPU. The feature allows Word users to copy the code to insert video into Word documents.
The video will then appear in a Word document, which can also be played by the user once they open the document later.
However, cyber attackers can add cryptojacking code in the video code, tricking the victim so that his computer is used to mine Monero to the hacker.
To make this attack more effective, attackers customize the video to fit a user's needs. When a video has been embedded in a Word document and played, the victim will think they are watching a video while their computer CPU is forced to go the extra mile to mine the virtual currency.