ransomware - Unable to open encrypted files

The manager has a virus on an external hd

It’s basically locked all his office files and changed the name to locked.filename.doc.random4letters

 
I need to get these documents back so he can open the file. The virus is one where if you have the virus and try and open the locked document you get a police popup saying ‘pay some money and open then’ I don’t know exactly, as the virus was on the laptop he had, which he no longer has, he just had the external hd with the locked files.

 

Anyway I found Kaspersky have a bit of software that can unlock these encrypted files, but you need one original file and he doesn’t have any originals.

 

http://support.kaspersky.com/us/viruses/solutions?qid=208286527

Does anybody have any ideas , I've attatched a screenshot showing the new file extensions attatched to the document.
locked-.bmp
phitusersAsked:
Who is Participating?
 
Dave HoweSoftware and Hardware EngineerCommented:
Possibly, but it would be a great deal of work. You would need to cut custom code to reverse-engineer the RC4 key from the encrypted docx files you have, using the fact that the DOCX files are by necessity actually zipfiles containing xml files, and hence have a known structure (they start with the letters PK and contain the default filenames - for example [Content_Types].xml, word/document.xml and word/fontTable.xml - which are stored in plain text in zip format)

Google doesn't show me anyone else having attempted this, so you would be on your own.
0
 
Dave HoweSoftware and Hardware EngineerCommented:
Sadly, you need the original - what happened to the infected laptop? usually least some of the easily recovered standard files are encrypted (eg from the MS Office dir) and the same key will work for both.
0
 
phitusersAuthor Commented:
The user had an issue with a laptop. These files were then transfered across and I believe the laptop has been rebuilt since, Which obviously means I have no access to the original files.

Thanks
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

 
Dave HoweSoftware and Hardware EngineerCommented:
I think you are going to have to resort to searching the external for "locked.*" then and hope there is at least one other file with the issue.

Decryption without a sample would be very difficult indeed - see the analysis here

http://malware.lu/Pro/RAP001_malware_rannoh_matsnu_1.1.pdf

for what is actually going on with these files.
0
 
BlueComputeCommented:
Do you mean that the files were copied to external drive when they had already been encrypted, and you then blew away the original OS and data?

As DaveHowe says, you need to find an encrypted file with known unencrypted content, eg normal.dotx to run the Kaspersky tool.
0
 
phitusersAuthor Commented:
Yes that is correct, Is there any other workaround if we don't have an unencrypted original?
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.