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Unk ransomware - DECRYPT.txt & filemarker of 12 bytes at the beginning


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#1 komentar

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Posted 18 June 2018 - 05:28 PM

I need help for my files. I have submitted files under https://www.bleepingcomputer.com/submit-malware.php?channel=168 with filename: ransomware_sample.rar.

Within the rar file:

2 js file (encrypt and original)

2  png file (encrypt and original)

decrypt.txt



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#2 Demonslay335

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Posted 19 June 2018 - 08:59 AM

@komentar

 

I'm afraid the detection by the ransom note name was probably a false positive. I'm not sure what ransomware it is quite yet, but it definitely is not Nemucod.

 

For Google's sake, here is the ransom note submitted ("DECRYPT.txt").

Hello. Your files have been encrypted due to a security problem with your PC. 
If you want to restore them, write ID:[redacted 7 numbers] to the mail zariqa@protonmail.com 

Example encrypted filenames:

 

20101223-04.55.16.4827-bart.png.36921.crypt

20101222-17.22.11.8692-maggiecopie9pm.png.36412.crypt

jquery.autoNumeric-1.9.42.js.34948.crypt

 

 

All of the files also have this same potential filemarker of 12 bytes at the beginning.

 

2018-06-19_0856.png


logo-25.pngID Ransomware - Identify What Ransomware Encrypted Your Files [Support Topic]

ransomnotecleaner-25.png RansomNoteCleaner - Remove Ransom Notes Left Behind [Support Topic]

cryptosearch-25.pngCryptoSearch - Find Files Encrypted by Ransomware [Support Topic]

If I have helped you and you wish to support my ransomware fighting, you may support me here.


#3 komentar

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Posted 19 June 2018 - 12:17 PM

@Ransomeware Hunter

 

I can confirm the 12 bytes signature on any encrypted file.

 

And from what I can see, there is a compression technique also applied to the files that originally a plain text file, like .js, .cs, .css, .xml, because there's a quite big reduction in file size in these type of files.

It leaves out binary file with .dll extension but still encrypt .pdb file (visual studio debugger file)

There couple of files that I previously change from .cs to .cs1, also got encrypted



#4 quietman7

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Posted 19 June 2018 - 05:14 PM

Since Demonslay335 confirmed this infection is not Nemucod, I have split all related replies into it's own topic to avoid confusion.
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