I haven’t post here from a lonnnng time… And i restart to explain a quick trick.
Few days ago, i search how to extract a malware from a malware defender quarantine files. A friend tell me, it’s encrypted by a RC4 and he give me the key. I have made a script to automatise that: MalwareDefenderDecrypter
The output is quite dirty, there is some bytes (probably headers) to remove until the MZ.
I have also add a kaspersky script decoder