: The malware could modify the appearance of legitimate banking websites on the victim's browser, adding fake fields that asked for Social Security numbers or PINs.

: ZeuS typically spread through "drive-by downloads" (where a user visits a compromised website) or phishing campaigns containing malicious attachments.

The ZeuS botnet represents a watershed moment in the evolution of cybercrime. Emerging in the late 2000s, it transitioned malware from simple disruptive scripts into a sophisticated, commercialized industry. As a modular Trojan horse, ZeuS focused primarily on financial theft through man-in-the-browser attacks and keystroke logging, eventually compromising millions of computers worldwide and causing hundreds of millions of dollars in damages. 1. Architecture and Proliferation

The effectiveness of ZeuS lay in its "crimeware-as-a-service" model. Versions like were part of a lineage where the source code was eventually leaked or sold, allowing various threat actors to build their own custom botnets.

: It employed advanced rootkit techniques to hide its processes and files from antivirus software, making detection and removal difficult for the average user. 3. The 2011 Source Code Leak