ESET reported that the DanaBot banking trojan was updated with a completely new command-and-control protocol that replaced earlier plaintext traffic with multiple layers of AES and RSA encryption. The change significantly reduced the visibility of network traffic, broke existing network-based detection signatures, and made packet analysis far more difficult without the corresponding RSA keys, indicating a deliberate effort by the operators to evade defenders and respond to prior public research.
Researchers also observed architectural changes in DanaBot’s delivery and persistence mechanisms. A new loader component now maintains persistence as a service and downloads the main module, plugins, and configuration files, while the updated malware was pushed both to existing victims and through malspam campaigns in Poland. Active campaign identifiers showed targeting in Poland, Italy, and Australia, alongside limited-functionality test campaigns, underscoring continued development and operational expansion by the threat actors behind DanaBot.

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2 events from the most recent confirmed update back to the earliest known activity.
After the late-January 2019 update, the revised DanaBot was observed being pushed to existing victims and spread through malspam campaigns in Poland. ESET also noted campaign ID changes, with active targeting in Poland, Italy, and Australia, plus limited-functionality test campaigns.
In late January 2019, DanaBot operators deployed a major update that replaced the malware's plaintext command-and-control traffic with a new protocol using multiple layers of AES and RSA encryption. ESET also observed architectural changes including a new loader that downloads the main module, plugins, and configuration files while maintaining persistence as a service.
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