From 2-spyware.com
LeakTheMall ransomware (aka LeakThemAll) is a data locking virus that was first discovered by cybersecurity researcher Amigo-A.[1] If your computer gets infected by this malware, your data will be encrypted with a “.crypt,” “.montana,” or “.beijing” extensions. For example, “a.pdf” would become “a.pdf.crypt,” b.pdf” as “b.pdf.crypt,” and exactly the same renaming applies to the Montana virus and Beijing virus, which will apply .montana and .beijing extensions accordingly.