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PyCL new iteration of ransomware


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#1 muhaha

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Posted 17 July 2017 - 03:44 AM

Hello,

please look at this comment:

https://www.bleepingcomputer.com/news/security/pycl-ransomware-delivered-via-rig-ek-in-distribution-test/#cid5838

 

Can not share/upload whole encrypted file (its big and contains sensitive informations).  I think that all of origin files are stored in one big encrypted file.

 

Or what can i provide more? Im not victim, only "man in the middle"...

Thanks

 

 



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#2 quietman7

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Posted 17 July 2017 - 05:50 AM

Files uploaded to Dropbox can be up to be 20 GB.

Filehosting has no size limitations.
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#3 muhaha

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Posted 18 July 2017 - 07:26 AM

I cant upload foreign sensitive data...  :(

I can upload rest of the files and do whatever says to me with encrypted files.

 

There is therory from @Demonslay335, that decryption is possible only with privatekey.

Which is unfortunately deleted...

Seems that  parameter u=xkwctmmh in network requests is identification string for getting privatekey from their api.



#4 quietman7

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Posted 18 July 2017 - 08:19 AM

If the key was deleted then I doubt there is anything which can be done. If possible, your best option is to restore from backups.
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#5 muhaha

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Posted 19 July 2017 - 03:16 AM

There is only demo.key, which contains:

['V3dGo1nuby7kYvIj', 'C:\\Users\\Administrator\\NTUSER.DAT{aab6203d-31ee-11e5-bbdd-082e5f32bfba}.TM.blf']



#6 muhaha

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Posted 28 July 2017 - 03:06 AM

Seem that there are two types of encrypted files. (suffix .jse and .crypted)

 

example:

http://www.filehosting.org/file/details/682915/files.zip

 

 

Found that PyCL was executed from Server (.crypted suffix)

This Rec86.jse encrypted some file in shared folder on Server too (.jse suffix i guess)

( C:\Users\$USER\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Rec86.jse;JS/TrojanDownloader.Nemucod.DBP )

 

Unfortunatelly Emisoft Decryptor for Nemucod does not work.

Thanks






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