Fabian Wosar of Emisoft has done it again with his release of a decrypter for the HydraCrypt and UmbreCrypt ransomware infections. Both of these infections are part of the CrypBoss Ransomware family, whose source code was leaked on pastebin last year. When analyzing this source code, Fabian had found a flaw that allowed him to release a decrypter last year for this family of infections. Though HydraCrypt and UmbreCrypt have since modified the encryption scheme, Fabian was still able to utilize the original flaw to crack these variants as well.
http://www.bleepingcomputer.com/news/security/emsisoft-releases-a-decrypter-for-hydracrypt-and-umbrecrypt-ransomware/
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