According to their respective configuration files, the versions of these samples are and Let’s see the most relevant differences in comparison with the most common versions:


– Encrypted connection. Both the downloading of the configuration file and access to the control panel are made through SSL connection. This is new; both 1.x and 2.x perform an HTTP connection in plain text, sending the encrypted data along with their respective algorithms.

– Change of encryption. The encryption used is the RC4 seen to date, but with a slight change in its “step”. It doesn’t use the xor encryption layer used by versions 2.x


S21sec Security Blog: ZeuS: The missing link.

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