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DUNGEON SPIDER is a criminal group operating the ransomware most commonly known as Locky, which has been active since February 2016 and was last observed in late 2017. Locky is a ransomware tool that encrypts files using a combination of cryptographic algorithms: RSA with a key size of 2,048 bits, and AES with a key size of 128 bits. Locky targets a large number of file extensions and is able to encrypt data on shared network drives. In an attempt to further impact victims and prevent file recovery, Locky deletes all of the Shadow Volume Copies on the machine.