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Anatova ransomware virus removal and decryption

6 min read
Learn why security analysts dubbed the new Anatova ransomware revolutionary in several ways and get the hang of techniques to remove and decrypt this strain.

With few exceptions, the crypto ransomware climate has been fairly dull for a year or so. The progress of this cybercrime domain hasn’t stopped to a halt, though. The recently discovered Anatova ransomware is irrefutable evidence of this. While going the down the well-trodden road of extortion, it appears to have unparalleled capabilities hidden underneath a layer of vanilla external manifestation. It turns out, the adverse repertoire of this sample includes a few interesting quirks, such as modular design and prevention of reverse-engineering attempts. Combined with competently written code and properly implemented cryptographic standard, these traits make the Anatova virus one of a kind. Furthermore, its executable was reportedly compiled in 2019, and it looks like an independently crafted sample operated by a new crew of online malefactors.

ANATOVA.txt ransom note
ANATOVA.txt ransom note

Contrary to most pieces of ransomware out there that engage malspam, exploit kits or RDP hacks, this one is propagating via peer-to-peer networks. As uncommon as it is, this vector has apparently resulted in a bevy of installs for the distributors. According to some publicly available statistics, the crooks have made hundreds of victims in the United States and a number of European countries over the course of the first outbreak. The bad program is masqueraded as a benign application or video game. The booby-trapped installer is executed without consent and awareness of the user who thinks it’s a great new app they are getting.

One of the most disconcerting properties of the Anatova ransomware’s behavior after contamination is that it goes ruthless on Volume Shadow Copies of the victim’s files, wiping them up to a dozen times. This is a serious obstacle to forensic recovery of the data. Another serious wakeup call is that the culprit leverages the “vssadmin” tool to do it, which means it gets administrative privileges on the host while circumventing permission request proper.

The encryption algorithm in this scenario is the Salsa20 stream cipher. In order to complete the cryptographic part of its mission, Anatova skips files larger than 1MB and ones located in paths that are important for the operating system to run smooth. Unlike garden-variety blackmail programs that append certain extensions to ransomed files, this sample does not alter the original filenames at all. That’s only the tip of the iceberg, though. The ransomware does make changes at a deeper level of file structure that’s invisible to the naked eye, yet identifiable by the malicious code. Specifically, it adds markers that prevent double encryption, a redundant thing for this type of malware that badly relies on lightning-fast attack routine.

As part of the raid, the Anatova ransomware leaves a rescue note behind. It is named ANATOVA.txt, and it will only appear inside directories with at least one encrypted item in them. This document instructs the victim to send an email to anatova2@tutanota.com or anatoday@tutanota.com, indicating the unique hexadecimal key from the note along with the address of outgoing payment for the decryptor. The ransom amounts to 10 DASH, worth 712 USD at the time of this writing.

As mentioned above, the Anatova virus features an analysis prevention mechanism. Its implementation is as follows: having made it into a host, the infection fetches the victim’s username and compares it against a predefined list of strings, such as “Lab”, “Tester”, “Malware” and a few more. The thing is, security researchers often include these terms as part of their usernames on a virtual machine used for code testing. If a matching item is found, the ransomware ceases the incursion in an attempt to keep itself from being reversed and extensively analyzed from different angles.

To top it all off, this infection potentially supports extra components as it goes with two DLLs. Although these files are functionally blank at this point, they are clues that this malicious entity is modular therefore the ransomware may assume additional characteristics further on. For instance, it may steal data or promote other malware before actually encrypting data on a target computer. Obviously, the Anatova attack is a serious quandary. Keep reading to get an idea of how to sort it out.

Anatova ransomware automated removal and data recovery

Owing to an up-to-date database of malware signatures and intelligent behavioral detection, the recommended software can quickly locate the infection, eradicate it and remediate all harmful changes. So go ahead and do the following:

1. Download and install the antimalware tool. Open the solution and have it check your PC for PUPs and other types of malicious software by clicking the Start Computer Scan button

Download Anatova ransomware remover

2. Rest assured the scan report will list all items that may harm your operating system. Select the detected entries and click Fix Threats to get the troubleshooting completed.

Data recovery toolkit to the rescue

Some strains of ransomware are known to delete the original files after the encryption routine has been completed. As hostile as this activity appears, it can play into your hands. There are applications designed to revive the information that was obliterated because of malfunctioning hardware or due to accidental removal. The tool called Data Recovery Pro by ParetoLogic features this type of capability therefore it can be applied in ransom attack scenarios to at least get the most important files back. So download and install the program, run a scan and let it do its job.

Download Data Recovery Pro

Data Recovery Pro

Anatova ransomware manual removal and file recovery

Some ransomware strains terminate themselves after completing the encryption job on a computer, but some don’t. Furthermore, the Anatova blackmail virus may prevent victims from using popular antimalware tools in order to stay on board for as long as possible. Under the circumstances, it may be necessary to utilize the Safe Mode with Networking or System Restore functionality.

Remove Anatova ransomware using Safe Mode with Networking

Remove Anatova ransomware using Safe Mode with Networking

Boot into Safe Mode with Networking. The method to do it depends on the version of the infected operating system. Follow the instructions below for your OS build.

  • Restart the machine. When the system begins loading back up, keep pressing the F8 key with short intervals. The Windows Advanced Options Menu (Advanced Boot Options) screen will appear.Boot into Safe Mode with Networking on Windows Vista and 7
  • Use arrow keys to select Safe Mode with Networking and hit Enter. Log on with the user account infected by the ransomware.
  • Click on the Search icon next to the Start menu button. Type msconfig in the search field and select the System Configuration option in the results. Go to the Boot tab in the upper part of the GUI.Boot options on Windows 8, 8.1 and 10
  • Under Boot options, select Safe boot and click the Apply button. A prompt will appear to reboot the computer so that the changes take effect. Select the Restart option and wait for the system to load into Safe Mode. Again, log on with the ransomware-stricken user account.

In Safe Mode, the ransom Trojan won’t keep security software from running or otherwise thwart troubleshooting. Open your preferred web browser, download and install an antimalware tool of choice and start a full system scan. Have all the detected ransomware components removed in a hassle-free way.

Get rid of Anatova ransomware using System Restore

Get rid of Anatova ransomware using System Restore

System Restore enables Windows users to roll back all changes made to the OS since the latest restore point creation time. This feature can help eliminate the most persistent ransomware. Before going this route, though, make sure System Restore had been enabled prior to the breach, otherwise the method will be inefficient.

  • Open Windows Advanced Options Menu as described in the previous section: hit F8 repeatedly when the PC is starting up. Use arrow keys to highlight the Safe Mode with Command Prompt entry. Hit Enter.Safe Mode with Command Prompt
  • In the Command Prompt window, type cd restore and hit Entercd restore command
  • Type rstrui.exe in the new command line and press EnterType rstrui.exe command
  • When the System Restore screen pops up, click Next, select a restore point that predates the contamination, and use the application’s controls to roll back the system to this earlier state.System Restore window

Be advised that even after the ransomware is removed, files will still be encrypted and inaccessible. The malicious code cleanup part, however, is important because it keeps a relapse of the infection from occurring further on and eliminates all opportunistic malware.

Ways of non-ransom recovery of files encrypted by Anatova

Cracking the crypto used by this ransom Trojan is more of a science fiction thing rather than an attainable prospect for the masses. This is why the troubleshooting in predicaments of this sort is a matter of two approaches: one is to pay the ransom, which isn’t an option for many victims; and the other is to apply instruments that take advantage of the ransomware’s possible weaknesses. If the latter is your pick, the advice below is a must-try.

Backups can make your day

Backups can make your day

Not only are you a lucky person in case you’ve been backing up your most important files, but you’re also a wise and prudent user. This isn’t necessarily a resource-heavy activity these days – in fact, some providers of online services are allocating a sufficient size of cloud storage space for free so that every customer can easily upload their critical data without paying a penny. Having removed the Anatova ransomware, therefore, all you have to do is download your stuff from the remote server or transfer it all from an external piece of hardware if that’s the case.

Restore previous versions of encrypted files

Restore previous versions of encrypted files

A positive upshot of using this technique depends on whether or not the ransomware has erased the Volume Shadow Copies of the files on your PC. This is a Windows feature that automatically makes and keeps the backups of data elements on the hard drive as long as System Restore is enabled. The cryptoware in question is programmed to switch off the Volume Shadow Copy Service (VSS), but it has reportedly failed to in some cases.

Checking one’s options regarding this workaround is doable in two ways: through the Properties menu of each file or by means of the remarkable open-source tool called Shadow Explorer. We recommend the software-based way because it’s automated, hence faster and easier. Just install the app and use its intuitive controls to get previous versions of the encrypted objects reinstated.
Shadow Explorer

Alternatively, you can leverage the Previous Versions feature, which is native to Windows operating system. This method is more cumbersome that the use of ShadowExplorer, but it can help restore the most important individual files on condition that the ransomware failed to disable the Volume Snapshot Service on the computer. Right-click on a file of choice and select Properties. Then, go to the Previous Versions tab as illustrated below.
Previous Versions

Go ahead and pick the file’s latest backup version on the list. Use the Copy or Restore buttons to reinstate this object to a new path or to its original folder, respectively.

Ransomware Prevention Tips

To avoid Anatova ransomware and other file-encrypting infections in the future, follow several simple recommendations:

  • Toggle your email provider’s anti-spam settings to filter out all the potentially harmful incoming messages. Raising the bar beyond the default protection is an important countermeasure for ransom Trojans

  • Define specific file extension restrictions in your email system. Make sure that attachments with the following extensions are blacklisted: .js, .vbs, .docm, .hta, .exe, .cmd, .scr, and .bat. Also, treat ZIP archives in received messages with extreme caution

  • Rename the vssadmin.exe process so that ransomware is unable to obliterate all Shadow Volume Copies of your files in one shot

  • Keep your Firewall active at all times. It can prevent crypto ransomware from communicating with its C&C server. This way, the threat won’t be able to obtain cryptographic keys and lock your files

  • Back up your files regularly, at least the most important ones. This recommendation is self-explanatory. A ransomware attack isn’t an issue as long as you keep unaffected copies of your data in a safe place

  • Use an effective antimalware suite. There are security tools that identify ransomware-specific behavior and block the infection before it can do any harm.
These techniques are certainly not a cure-all, but they will add an extra layer of ransomware protection to your security setup.

Revise your security status

Post-factum assessment of the accuracy component in malware removal scenarios is a great habit that prevents the comeback of harmful code or replication of its unattended fractions. Make sure you are good to go by running an additional safety checkup.

Download Anatova ransomware removal tool

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