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Restoring backups after the Harma ransomware virus

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The Harma ransomware virus does not fully encrypt this applies to all large files larger than 100MB. I figured out a bit what was damaged in the * .tib archive . The file header is 262144 bytes in size (in the HEX-editor from 0000 0000 to 0004 0000) is filled with 0. At the end of the file, data of the same size is also cut and recreated with new data, where is the area (if the end of the deleted archive is counted from 0000 0000) 000C 013F is filled with 0, then comes the encrypted part for the header and end of the file 000C 013F to 0010 012F. And now about restoring the archive itself. Took for a working image of the archive created from the same partition of the disk as the archive that I want to restore. I used the HEX editor FlexHex (as for me it is very simple and convenient). I cut the header from the created archive and transferred it to the editable one, also performed different transfer options in the tail, and saved every time. Acronis TI at the same time gives an error reading the archive. I tried the options, taking as a basis the archives of a clean disk (partition), I also tried to recreate other directories with directories without files. Then I don’t know where to look for a solution.

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welcome to these public User Forums.

Sorry but if your Acronis .tib archive file has been corrupted / encrypted / changed by another application / ransomware, then I doubt that you can recover it by the process you have been trying.

This is because Acronis store checksum values throughout the archive file when it is written to disk and every one of these checksum values have to match when the file data is verified.  Creating another file will never be the same as having a copy of the original one to use.

The only way around this type of issue is to have more than one backup archive that you can attempt to recover your system from.  If you do not have this, then you are either looking for a method of decrypting the ransomware or else doing a clean install of your computer.