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Is there a ransomware variant that checks for file's magic numbers to encrypt?

Is there a known ransomware-variant (Cryptolocker, Cryptowall etc.) that before encrypting the files checks for their magic numbers? Lets say that there's a Word file, that had its file extension ...
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Exfiltration File Type

Under the assumption that an exfiltration of a large file(s) may be discovered at any time, and the connection terminated/cut, what file type(s) can be used to ensure some/any amount of data is ...