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Unidentified Crypto virus - might be a new variant


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5 replies to this topic

#1 CorrieTheron

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Posted 24 February 2017 - 04:29 AM

Okay, we don't have much info and we could not get any more info on the webs. What we have is this error message when logging on to Windows - 


"[.ShellClassInfo] LocalizedResourceName=@%SystemRoot%\System32\Shell32.dll,-21787"

 

And the files with a ".bfodug" extension. Cannot find any other info anywhere. Hex signatures does not look familiar. Will submit for analysis now. Should be interesting.

 

Thanks

C



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#2 quietman7

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Posted 24 February 2017 - 06:52 AM

There are several different ransomware infections which append a random 4, 5, 6, 7 character extension to the end of all affected filenames. CTB-Locker and Maktub Locker are the two most common ransomware infections which use a random 6-7 character extension appended to the end of the file name. The newest variant of Crypt0L0cker appends a random 6 lower alphabetic character extension. Alma Locker appends a random 5-6 character extension. Goldeneye appends an random 8 character extension. Princess Locker appends a random 4-5 hexadecimal character extension. Mischa appends a random 4 character extension. Locked-In appends a random 5-15 character extension. Some Xorist Ransomware variants will also have a random character extension appended to the end of the file name.

Did you find any ransom notes and if so, what is the actual name of the note? These infections are created to alert victims that their data has been encrypted and demand a ransom payment. Check your documents folder (C:\ProgramData, C:\Documents and Settings\All Users\Application Data) for an image the malware typically uses for the background note or a randomly named .html, .txt, .png, .bmp, .url file. Most ransomware will also drop a ransom note in every directory/affected folder where data has been encrypted.

Did the cyber-criminals provide an email address to send payment to? If so, what is the email address?

The best way to identify the different ransomwares that use "random character extensions" is the ransom note (including it's name), samples of the encrypted files, the malware file itself or at least information related to the email address used by the cyber-criminals to request payment.

Uploading both encrypted files and ransom notes together at ID Ransomware for assistance with identification and confirmation provides a more positive match and helps to avoid false detections.

Based on infection rates we see, you are most likely dealing with CTB-Locker or the new Crypt0L0cker.
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#3 CorrieTheron

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Posted 02 March 2017 - 02:51 AM

Thanks bud. Will pulse the client again for more information. They haven't been much help so far. Will reply if I have something. Have a good one..



#4 quietman7

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Posted 02 March 2017 - 07:11 AM

You're welcome and good luck.
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#5 CorrieTheron

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Posted 10 March 2017 - 07:46 AM

Okay, it looks like Crypt0L0cker as you suggested :) I have given the client the bad news :)

 

Crypt0l0cker-1.png?raw=1

 

Crypt0l0cker-2.png?raw=1



#6 quietman7

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Posted 10 March 2017 - 08:45 AM

Unfortunately, there is no free decryption solution for encrypted files. However, many victims have reported that Dr.Web was able to assist them with decrypting files...see here.

Policy from Dr.Web (11/25/15): Free file decryption assistance only for PCs protected by Dr.Web at the moment of infectionIf you're not a licensed user for a Dr.Web product you will have to pay for their services (Rescue Pack). Fees may vary depending on the infection and amount of data to be decrypted.

There is an ongoing discussion in this topic where victims can post comments, ask questions and seek further assistance. Other victims have been directed there to share information, experiences and suggestions.Rather than have everyone with individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in the above support topic discussion...it includes experiences by experts, a variety of IT consultants, end users and company reps who have been affected by ransomware infections. To avoid unnecessary confusion, this topic is closed.

Thanks
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