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.
: ZeuS typically spread through "drive-by downloads" (where a user visits a compromised website) or phishing campaigns containing malicious attachments. ZeuS Botnet 2.0.8.9.rar
: 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 Botnet 2.0.8.9.rar