![]() The structure after decrypting file 5D92927E35A6D8FECE000ABB9739F5AEFF914A3EĪs seen on the picture, the decrypted file contains some additional metadata at the beginning and end. To decrypt files in this folder, we simply need to apply the RC4 to the whole file. Every sample is also grouped into a subfolder, where subfolder name is obtained from the first two characters of a hash. The filenames are composed of a custom hash, uniquely identifying each sample. This is where the actual quarantined files are stored. For example, if a whole folder is placed into quarantine in one go, only one Entry file will be created, holding information about all files within that folder. In some cases, an Entry file may contain information about multiple quarantined files. Usually, one Entry file maps to exactly one quarantined file, but this is not always the case. The second highlighted area is the unique hash, which we can use to find the matching raw-data file in ResourceData folder. The structure of an Entry file consists of three chunks that are separately encrypted with RC4 ![]() ![]() From each such file we can extract the following information: ![]()
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