However i'm still curious to know if it is just a usuall UBS driver with software inside or if this stick hide special hardware.
No one can say for certain.
I have a Kingston IronKey Vault Privacy 50 which includes a dedicated hardware chip for encryption/decryption operations. However, the device you're referring to is significantly cheaper than the IronKey, so it's reasonable to assume that its encryption is primarily handled at the software level rather than through dedicated hardware.