Zimbra Ransomware - How to remove

Zimbra Ransomware

Zimbra enterprise, founded by LiquidSys, provides an open source email platform that is used by over 500 million people around the globe. We have recently found out that a ransomware by the same name has emerged from the ashes. ZimbraCryptor virus or more shortly known like just Zimbra. This crypto-ransomware threat stands out from others by having a clear-cut list of targets. Users of Zimbra email servers should be trembling from the evil force, coming out of ZimbraCryptor ransomware. Furthermore, security researchers noticed that this virus uses the interactive Python programming language.

About Zimbra Ransomware

When Zimbra virus enters computer systems, it encrypts the files that users keep in the servers of Zimbra. All of the data stored in email message store folder will most likely become unreachable by their owner. To be more specific, this data is encrypted, corrupted, ruined by Zimbra ransomware. The encryption process is performed with the help from RSA and AES algorithms. Two keys are created but for completely different purposes. The public key is for encrypting and the private one (for decryption) is kept safely stashed away in hackers’ domains. Security researchers, even woken up in the middle of the night, can easily enumerate the further tactics of ransomware viruses. The selected strategy is always played out the same.

Zimbra ransomware is no exception. After files are encrypted, users notice that it is impossible to open them as a decryption key is required. To continue with the plan by Zimbra virus, pursued by many other viruses as well, hackers constructed a ‘sweet’ message for their victims. File named how.txt will contains demands for the safe data return. Victims that have already survived Zimbra virus, have concluded to receive this message:

Hello, If you want to unsafe your files you should send 3 btc to 1H7brbbi8xuUvM6XE6ogXYVCr6ycpX3mf2 and an email to [email protected] with: [public_key_here].

Furthermore, all corrupted files have the same ending: .crypto. Our guess is that hackers like to show-off their successful encoding. Also, do not contact the provided email address: [email protected].

How to Decrypt Files Encrypted by Zimbra Ransomware?

We cannot say that there is a guaranteed method to restore all of the files, encrypted by Zimbra ransomware. If you have stored this data in back-up storages, the best option would be to obtain it from there. However, if you were not aware of the advantages of storing your data in other places as a security measurement, we can give you a couple of tips how encrypted data can be revived. As this ransomware uses the same file extension as the Rakhni virus, it might be possible to decrypt files by using the Kaspersky’s Rakhni decryptor. The most important thing is not to pay the demanded ransom of 3 bitcoins (about 1785 dollars). That is a pretty solid sum of money that should not be transferred to hackers.

How is Zimbra Ransomware Spread?

Zimbra ransomware can sneakily invade your system. Seemingly legitimate consignors can sent email letters with attachments to people’s email accounts. Then, it uses the Trojan horse tactics to disguise itself as an executable and useful file, in order to force users to download it. However, it is really just a ransomware, waiting for you to make an error. Zimbra virus might have ended up in your computer because you believed in an unreliable message from hackers and downloaded a file that was proclaimed to be an update for software or etc.

We genuinely think that you have to posses a strong anti-malware tool in order to be safe. Spyhunter or Malwarebytes are perfect scanners to pull up the roots of Zimbra virus from your computer system.

How to recover Zimbra Ransomware encrypted files and remove the virus

Step 1. Restore system into last known good state using system restore

1. Reboot your computer to Safe Mode with Command Prompt:

for Windows 7 / Vista/ XP
  • Start Shutdown RestartOK.
  • Press F8 key repeatedly until Advanced Boot Options window appears.
  • Choose Safe Mode with Command Prompt. Windows 7 enter safe mode

for Windows 8 / 10
  • Press Power at Windows login screen. Then press and hold Shift key and click Restart. Windows 8-10 restart to safe mode
  • Choose TroubleshootAdvanced OptionsStartup Settings and click Restart.
  • When it loads, select Enable Safe Mode with Command Prompt from the list of Startup Settings. Windows 8-10 enter safe mode

2.Restore System files and settings.

  • When Command Prompt mode loads, enter cd restore and press Enter.
  • Then enter rstrui.exe and press Enter again.CMD commands
  • Click “Next” in the windows that appeared. Restore point img1
  • Select one of the Restore Points that are available before Zimbra virus has infiltrated to your system and then click “Next”. Restore point img2
  • To start System restore click “Yes”. Restore point img3

Step 2. Complete removal of Zimbra Ransomware

After restoring your system, it is recommended to scan your computer with an anti-malware program, like Spyhunter and remove all malicious files related to Zimbra virus. You can check other tools here.  

Step 3. Restore Zimbra Ransomware affected files using Shadow Volume Copies

If you do not use System Restore option on your operating system, there is a chance to use shadow copy snapshots. They store copies of your files that point of time when the system restore snapshot was created. Usually Zimbra virus tries to delete all possible Shadow Volume Copies, so this methods may not work on all computers. However, it may fail to do so. Shadow Volume Copies are only available with Windows XP Service Pack 2, Windows Vista, Windows 7, and Windows 8. There are two ways to retrieve your files via Shadow Volume Copy. You can do it using native Windows Previous Versions or via Shadow Explorer. a) Native Windows Previous Versions Right-click on an encrypted file and select PropertiesPrevious versions tab. Now you will see all available copies of that particular file and the time when it was stored in a Shadow Volume Copy. Choose the version of the file you want to retrieve and click Copy if you want to save it to some directory of your own, or Restore if you want to replace existing, encrypted file. If you want to see the content of file first, just click Open.
Previous version
b) Shadow Explorer It is a program that can be found online for free. You can download either a full or a portable version of Shadow Explorer. Open the program. On the left top corner select the drive where the file you are looking for is a stored. You will see all folders on that drive. To retrieve a whole folder, right-click on it and select “Export”. Then choose where you want it to be stored.
Shadow explorer

Step 4. Use Data Recovery programs to recover Zimbra Ransomware encrypted files

There are several data recovery programs that might recover encrypted files as well. This does not work in all cases but you can try this:
  • We suggest using another PC and connect the infected hard drive as slave. It is still possible to do this on infected PC though.
  • Download a data recovery program.
  • Install and scan for recently deleted files. Data Recovery Pro
Note: In many cases it is impossible to restore data files affected by modern ransomware. Thus I recommend using decent cloud backup software as precaution. We recommend checking out Carbonite, BackBlaze, CrashPlan or Mozy Home.
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