Ousaban Banking Trojan Targets Iberian Bank Users with Fake PDF Lures

The Ousaban campaign exploits a fundamental gap in end-user security awareness: users are tricked into clicking fake 'Update' buttons embedded in phishing PDFs disguised as corrupted files, initiating a malware infection chain. Once installed, the trojan silently monitors banking sessions and harvests credentials, enabling full account takeover. The malware's use of steganography, geo-blocking, and daily-rotating command-and-control addresses makes it exceptionally difficult for traditional detection tools to flag. This attack matters because it demonstrates how sophisticated social engineering, combined with advanced evasion techniques, can bypass both technical controls and untrained users. Financial institutions and their customers in targeted regions face significant fraud and data breach risk without layered defenses.