Petna ransomware virus. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware
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Petna ransomware hides several secrets within

The screenshot of Petna ransom note

Petna virus is the alternative name of a recent malware outbreak also called as Petya/Notpetya/Expetr/PetrWrap. IT experts will remember June 27 as the day a global cyber chaos. Unfortunately, it is the second case in a two months row. Multiple corporations all around the world reported having been struck with Petya malware.

Right after the emergence, online media got flooded with reports that the latest version of the notorious threat assaulted the virtual community.

Thus, the malware was labeled as NotPetya. However, after a closer look, specialists came up with the idea that it IS actually Petya, but its source code is overwritten.[1]

The latest version of so-called Pertya.a/Petna behaves similarly to previous versions, instead of simply breaking into a system and encrypting personal files, the malware modifies boot settings enabling to run malware instead of Windows OS.

With the assistance of its unique operating system, the threat encodes valuable documents as well. However, it does not have a tendency to append any file extension. Likewise, these features enable the virus to wreak global chaos.

Recent findings reveal that there is no point in paying the money, as one of the perpetrator's email domain has been shut down, which means that you will not get your files back even if you pay the ransom.[2] Thus, make a rush to remove Petna ransomware. Reimage or Malwarebytes Anti Malware might be of assistance in this task.

The virus turns out to be something else than ransomware

Right when some of the users thought that sufficient protection would be ensured to evade the same scenario after WannaCry attack, Petna manifested its power on the entire cyber world. The attack reverberated in numerous countries, including constant target Ukraine, the United Kingdom, the US, Australia, Russia, France[3], Spain and many more others.

Unfortunately, the world has not learned its lesson as the malware fed on the same on same system vulnerabilities as WannaCry – EternalBlue and weak SMB protocols.

However, the recent analysis by Comae Technologies and Kaspersky Lab report disclosed an astonishing fact – the malware is not actually crypto-virus!

It may seem that the malware is actually a disk wiper, but experts note that the malware does not delete files, but in fact, does not assign specific ID to a particular victimized computer meaning that it is nearly impossible to recover the files without acquiring the decryption key.

Anton Ivanov, Kaspersky Lab researcher, suggests that the original motive behind they virus was not profit making but rather mere destruction[4]. Interestingly, that this current version, Petna malware, seems to have been programmed by a different author than the original version. In any case, there is no point in transmitting the files but rather perform Petna removal.

Petna spreads via corrupted update system?

The malware seems to have assaulted the same way as WannaCry – through system vulnerabilities. However, further analysis linked that the main source of infection was the Ukrainian accounting software developer M.E Doc. Perpetrators hacked into it and corrupted update network.

Thus, any company which used this software and installed the updated got infected as well.[5] The company denied such allegations even though the researchers claim to have log files as proofs.

Looking from a technical perspective, the malware function via smbpeyta_kernel.bin, perfc.dat, and similar system files. At the moment, the most viable Petna hijack prevention is to update your operating system with cyber security tools.

Eliminating the malware

Since it is futile paying the ransom and expect data retrieval, make Petna removal your top priority. Naturally, ordinary uninstall and removal methods might not work out from the first attempt. Since the malware modified your boot systems, you will not be able to simply access anti-virus tools. Thus, you may benefit from below indicated instructions.

Note that the malware will load before Windows OS, you will have to tap F8 or F2 right after the initial Windows sign appears to enter Advanced Boot settings. There, you should be able to choose Safe Mode or System Restore to remove Petna virus.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Petna ransomware virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

More information about this program can be found in Reimage review.

More information about this program can be found in Reimage review.

Manual Petna virus Removal Guide:

Remove Petna using Safe Mode with Networking

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Petna

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Petna removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Petna using System Restore

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

In the case of Penta hack, launching System Restore might be troublesome. However, try to enter the settings before the malware loads.

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Petna. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Petna removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Petna from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Petna, you can use several methods to restore them:

Data Recovery Pro option

Though it is designed to restore lost or damaged files, in this case, Petna virus highly complicates data retrieval and the usage of third-party decrypters.

Will ShadowExplorer decrypt files?

It comes in handy when dealing with the ransomware which does not delete shadow volume copies. When it comes to Petna, which wrecks boot process, this method might be bothersome. However, at the moment there is no universal Petna Decrypter released yet, so this method might be your last resort.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Petna and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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