A cybercrime gang called Silence targeted at least 10 banks in Russia, Armenia, and Malaysia borrowing hacking techniques from the dreaded Carbanak group. The Silence gang was uncovered by researchers at Kaspersky Lab who speculate it is imitating the notorious hacker group that stole as much as $1 billion from banks worldwide. The group used backdoors to gain persistence on the targeted banks and monitor operations of its employees. The hackers leverage a proprietary Microsoft online help format called Microsoft Compiled HTML Help (CHM) because the files are interactive and can run JavaScript.”]
Source: https://securityaffairs.co/wordpress/65061/cyber-crime/silence-group-bank-attacks.html