![]() ![]() This information would be lost if conventional methods were applied, even when supplemented by the capture and analysis of physical memory. ![]() We present a scenario that shows that live system investigation is indispensable in obtaining complete information about the system being examined. The hash value for the encrypted data calculated before and after the extraction is identical, so this approach can be considered to be forensically sound. The method of extraction is built around a software utility, Robocopy, which does not modify any metadata of the file system during extraction. Visitors who are looking for solutions to decrypt BitLocker files or recover encrypted files by ransomware should go to the linked pages. Here, we focus on discussing the possibilities of unlocking EFS encrypted files only. In this article we demonstrate the methodology of extracting EFS-decrypted files from a live system. EFS is one of the multiple ways to encrypt individual files and folders in Windows. EFS files can be manipulated transparently by the owner and the system administrator as long as they reside in an NTFS file system. The Windows operating system provides the option to encrypt files using an encryption driver bundled with the New Technology File System (NTFS) file system, the so-called encrypting file system (EFS). Encrypted files captured by acquiring a bit-by-bit image in the process of conventional forensic investigation are practically impossible to decrypt without knowing the key and the method of encryption.
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