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Ransomware? Files Encrypted, Renamed, Inaccessible. Am I Infected? Please Help

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#1 mamero


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Posted 10 November 2016 - 07:18 PM

Yesterday I noticed my hard drive light was working unusually hard. I instantly shut down, ran both Malwarebytes and Superantispyware. Malwarebytes found some things. I removed them but did not make note of what it removed because I did not see any damage at the time.

Today (the following day) I went to work in Excel and noticed strange behavior relating to files that could not be found. I quickly realized that about 75% of my files across two physical hard drives have names and extensions that have changed. Obviously the file renaming/encryption is what my computer was suspiciously up-to yesterday. The file names are random but they all share the same extension. The extension is *.8877. The modified date and time are the same as well.

Example. An mp3 file that did have a file name of "11 - Rock'n Roll.mp3" now is "d87VrXO9GD.8877".

I ran Malwarebytes again today in safe mode ran 3 times.

Below is what Malwarebytes found on those scans. I cannot confirm if this is the related to the issue, or a coincidence. These have now been removed:

1. Trojan.MalPack, C:\Users\Mark\AppData\Local\Temp\rad0C5EA.tmp.exe, , [1a84ebd38d0dfa3ccc9cf2db000346ba],

2. PUP.Optional.Spigot, C:\Users\Mark\AppData\Roaming\Mozilla\Firefox\Profiles\kyz1lfbj.default\prefs.js, Good: (), Bad: (user_pref("keyword.URL", "https://search.yahoo.com/search?fr=greentree_ff1&ei=utf-8&ilc=12&type=888596&p=");), ,[8a144777ebafc1755f77b5854ab9e51b]

This is my first time confronted with potential ransomware. I've read that others who contract ransomware often have their system locked with a screen stating what to do (or asks for money/bitcoin). I was not presented with a lock screen, hijack screen, or instructions of any kind. Perhaps because I shut my computer down during the the encryption it prevented it from completing or showing any screen.

Where and how should I begin to restore my data? There is data I really need to recover that is not on my last backup. The file sizes are correct so I assume the data is there, just not accessible.

I have a couple screen shots that shows how file names looked before and after if that helps. I'm not sure how to upload images to this forum, if possible.

OS. Windows 7 Ultimate. 64bit. Service pack 1.

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#2 quietman7


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Posted 10 November 2016 - 08:42 PM

Example. An mp3 file that did have a file name of "11 - Rock'n Roll.mp3" now is "d87VrXO9GD.8877"

Any files that are encrypted with the newest Cerber variant will be renamed (encrypted) with 10 random characters and have a random 4 character extension appended to the end of the encrypted data filename (i.e. 1xQHJgozZM.b71c) and leave files (ransom notes) named README.hta...see here.

You can submit samples of encrypted files and ransom notes to ID Ransomware for assistance with identification and confirmation. This is a service that helps identify what ransomware may have encrypted your files and then attempts to direct you to an appropriate support topic where you can seek further assistance.

Trend Micro released a Ransomware File Decryptor for victims of earlier Cerber v1 infections but it has limitations noted near the bottom...must be used on the infected machine, may take several hours to complete decryption, some files may be only partially decrypted.

Unfortunately, there is still no known way to decrypt files encrypted by Cerber v2/v3 or the newer 10 random characters with a random 4 character (i.e. .b71c) extension without paying the ransom. Trend Micro's decryption tool does not work on these variants.

There is an ongoing discussion in this topic where you can 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.

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