Security Basics mailing list archives
Re: Can we recover data from corrupted excel file
From: Mark Bassett <zosxavius () gmail com>
Date: Wed, 08 Jun 2005 15:03:03 -0400
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Amit shrma wrote:
Dear all, *** Need Help *** All of my xls files have been corrupted by w32.chir.b virus. Basically what this virus do is stated just below. " On the first day of each month, W32.Chir.B@mm attempts to overwrite the first 4660 bytes of files that have .adc, r.db, .doc, and .xls extensions in all folders and subfolders. " quoted at symantec.com.
It is hard to get files to read when their headers have been destroyed. Look at the first 4660 bytes on a good excel file and see if you can do a swap with a HEX editor. It may be worth a try. I am running Office 2003, so I'm guessing 2k3 uses a slightly different file format, or I would try and help you some more. Also, you should really be backing up critical data. It sucks that you have to learn this way, but now you should be a bit wiser as to how you manage your data. If everything is on a hard drive that is a single point of failure, and as you have found out, it does not have to be the hard drive itself that fails. Wish I could help you more. You may want to google for some forensics tools if you are not able to fix the file headers. Some of the better ones will extract chunks of data from files. It may be better than nothing. Good luck. Mark Bassett -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) iD8DBQFCp0DnvNkqLPQVYL4RApp6AJwO9ALi9kj1FnC9eEaq4+gqNAppkQCfVv5t 9uE0942trMdHSAj0MW8gTnk= =ET61 -----END PGP SIGNATURE-----
Current thread:
- Can we recover data from corrupted excel file Amit shrma (Jun 08)
- Re: Can we recover data from corrupted excel file Mark Bassett (Jun 08)