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Unknown Ransomeware Attack


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#1 LloydF

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Posted 18 April 2018 - 09:28 AM

We were hit with an attack 11/11/2016 - the ransome note was lost in a computer restore.  We were able to recover most files from back-up, but found that we had an old drive that was not archived/backed-up...

 

I would really like to gain access to this old drive.

 

Uploading one of the infected files to ID Ransomeware did not reveal the virus type.  Neither the file name, or the file extn name have been changed.  All files have been date stamped identically 11/11/2016 the exact time varies according to when the file was hit.

 

Would welcome any advice or assistance.

 

Kind regards,

Lloyd


Edited by LloydF, 18 April 2018 - 09:29 AM.


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#2 quietman7

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Posted 18 April 2018 - 03:08 PM

CryptoWall, PClock, Spora, Sigma, CrypMic, DMA Locker, Locker, AES-Matrix, Microsoft Decryptor (CryptXXX), Cryptofag, TeslaCrypt v4.0, CryptoHost, MotoxLocker (DetoxCrypto), KawaiiLocker, Hermes, Data Keeper, LoveServer, Power Worm, KEYHolder and CryptorBit encrypts files but do not append or change file extensions. Newer variants of Nemucod (Nemucod-AES) and Mobef also do not append any extensions to encrypted filenames.

Some ransomware variants (i.e. DMA Locker, TeslaCrypt, CrypMic) will add a unique hex pattern (filemarker) identifier in the header of every encrypted file so the ransomware can identify the file as one it encrypted. Spora-encrypted files utilize a 4 byte long Crc32 file marker. CryptoWall is identified by how the files are renamed. CryptoWall 3.0 and 4.0 encrypted files typically will have the same 16 byte header which is different for each victim. PClock, Mobef and Cryptofag do not use a filemarker.

The best way to identify the different ransomwares with ID Ransomware is the ransom note (including it's name), samples of the encrypted files, any obvious extensions appended to the encrypted files, information related to any email addresses or hyperlinks provided by the cyber-criminals to request payment and the malware file responsible for the infection.

Without the above information or if there is no extension or filemarker in encrypted files, our crypto malware experts most likely will need a sample of the malware file itself to analyze before the type of infection can be confirmed. Samples of any suspicious executable's (installer, malicious files, attachments) that you suspect were involved in causing the infection can be submitted (uploaded) here with a link to this topic...it's best to zip (compress) all files before sharing. There is a "Link to topic where this file was requested" box under the Browse button.
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#3 LloydF

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Posted 24 April 2018 - 03:19 AM

Hi Quietman7, thank you for responding.  I have uploaded a sample file (a .jpg in this example) although all file types were infected.  I hope to receive a response in due course.

 

Kind regards,

Lloyd



#4 quietman7

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Posted 24 April 2018 - 05:49 AM

Not a problem.

Bleeping Computer is inundated with support requests and not everyone may receive an individual reply. After our volunteer experts have examined submitted files, they typically will only reply in a support topic if they can assist or need further information. If not, then the submissions were not helpful.
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