Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

I nuked and paved a machine not knowing the files were encrypted


  • Please log in to reply
5 replies to this topic

#1 kuessedauern

kuessedauern

  • Members
  • 17 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Chicago
  • Local time:03:17 AM

Posted 13 June 2014 - 03:41 AM

Hello,

 

I was repairing a clients laptop, and I nuked the OS and re-installed it recovering all his files from a backup.

I have a backup of the entire OS drive from before this, but now the RSA keys are not associated with the user and I don't have an "infected computer" from which to retrieve the key.

 

Is there no way to decrypt the files then?

 

The shadow copies only go back as far as when I did the repair. 6.3.2014.

Unfortunately every backup is also encrypted/infected.

 

Thank you in advance for any help or assistance.

 

 



BC AdBot (Login to Remove)

 


#2 TsVk!

TsVk!

    penguin farmer


  • Members
  • 6,230 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:The Antipodes
  • Local time:06:17 PM

Posted 13 June 2014 - 04:31 AM

Were they malware encrypted files?



#3 Kilroy

Kilroy

  • BC Advisor
  • 3,318 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Launderdale, MN
  • Local time:03:17 AM

Posted 13 June 2014 - 08:15 AM

If this is a corporate machine there should be a "master" recovery key that can be installed to decrypt the files.



#4 quietman7

quietman7

    Bleepin' Janitor


  • Global Moderator
  • 51,111 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Virginia, USA
  • Local time:04:17 AM

Posted 13 June 2014 - 09:47 AM

There are several types of crypto malware ransomware variants making rounds...Cryptolocker, CryptoDefense, CryptoWall, CryptorBit and HowDecrypt Encrypting Ransomware, etc

In order to assist you better we would need to know which one you are dealing with.
.
.
Windows Insider MVP 2017-2018
Microsoft MVP Reconnect 2016
Microsoft MVP Consumer Security 2007-2015 kO7xOZh.gif
Member of UNITE, Unified Network of Instructors and Trusted Eliminators

If I have been helpful & you'd like to consider a donation, click 38WxTfO.gif

#5 kuessedauern

kuessedauern
  • Topic Starter

  • Members
  • 17 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Chicago
  • Local time:03:17 AM

Posted 13 June 2014 - 11:32 AM

It is Cryptowall.

 

Its ransomware message goes as follows:

 

"What happened to your files ?

All of your files were protected by a strong encryption with RSA-2048 using CryptoWall.
More information about the encryption keys using RSA-2048 can be found here: http://en.wikipedia.org/wiki/RSA_(cryptosystem)
 
 
What does this mean ?
This means that the structure and data within your files have been irrevocably changed, you will not be able to work with them, read them or see them,
it is the same thing as losing them forever, but with our help, you can restore them.
 
 
How did this happen ?
Especially for you, on our server was generated the secret key pair RSA-2048 - public and private.
All your files were encrypted with the public key, which has been transferred to your computer via the Internet.
Decrypting of your files is only possible with the help of the private key and decrypt program, which is on our secret server.
 
 
What do I do ?
Alas, if you do not take the necessary measures for the specified time then the conditions for obtaining the private key will be changed.
If you really value your data, then we suggest you do not waste valuable time searching for other solutions because they do not exist.
 
 
For more specific instructions, please visit your personal home page, there are a few different addresses pointing to your page below:
 
If for some reasons the addresses are not available, follow these steps:
2.After a successful installation, run the browser and wait for initialization.
3.Type in the address bar: kpai7ycr7jxqkilp.onion/44bw
4.Follow the instructions on the site.
 
 
IMPORTANT INFORMATION:
Your personal page (using TOR): kpai7ycr7jxqkilp.onion/44bw
Your personal identification number (if you open the site (or TOR 's) directly): 44bw"


#6 quietman7

quietman7

    Bleepin' Janitor


  • Global Moderator
  • 51,111 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Virginia, USA
  • Local time:04:17 AM

Posted 13 June 2014 - 04:17 PM

CryptoWall is essentially CryptoDefense rebranded with a new name.

A repository of all current knowledge regarding CryptoDefense is provided by Grinler (aka Lawrence Abrams), in this tutorial: CryptoDefense and How_Decrypt Ransomware Information Guide and FAQ

Reading that Guide will help you understand what CryptoDefense and How_Decrypt Ransomware does and provide information for how to deal with it and possibly decrypt/recover your files.

There is also a lengthy ongoing discussion in this topic: New Crypto variant? CryptoWall...CryptoDefense with a new name. Rather than have everyone start individual topics, it would be best (and more manageable for staff) if you posted any questions, comments or requests for assistance in that topic discussion.

Thanks
The BC Staff
.
.
Windows Insider MVP 2017-2018
Microsoft MVP Reconnect 2016
Microsoft MVP Consumer Security 2007-2015 kO7xOZh.gif
Member of UNITE, Unified Network of Instructors and Trusted Eliminators

If I have been helpful & you'd like to consider a donation, click 38WxTfO.gif




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users