"Oops, Your Important Files Are Encrypted" (Petya.A WannaCry Ransom Virus) - How to, Technology and PC Security Forum

by Ventsislav Krastev | June 27, 2017 | 1 Comment malware, ransomware, WannaCry

Threat Summary How Does Petya.A Ransomware Infect Petya Ransomware – Technical Analysis How to Try and Recover Drives By Petya.A Ransomware Conclusion and Updates On Petya

This article aims to help you learn more about the latest ransomware outbreak spreading Petya ransomware. It will also show you how to remove the latest Petya.A ransomware virus and restore access to your computer successfully.

Just when we thought something was learned from the massive WannaCry ransomware outbreak, there comes yet another virus like a blast from the past, using the same exploits as WCRY to spread. The malware is known by many as Petya ransomware and it does not encrypt files, but directly attacks the Master Boot Record of the infected computer to encrypt the sectors of it’s hard drive. The latest iteration of Petya, then poses as the notorious WannaCry virus by displaying very similar ransom note beggining with the same “Oops, Your Important Files Are Encrypted” ransom note. If you have become a victim of this version of Petya ransomware, we strongly urge you to the following material on the subject.

Threat Summary

Name	Petya.A
Type	Ransomware
Short Description	Petya.A ransomware encrypts the MBR and then demands $300 for a ransom payoff to get the files back..
Symptoms	The ransomware creates a lockscreen, named “Oops your important files are encrypted”.
Distribution Method	Spam Emails, Email Attachments, Executable Files
Detection Tool	See If Your System Has Been Affected by malware Download Malware Removal Tool
User Experience	Join Our Forum to Discuss Petya.A.
Data Recovery Tool	Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

Update July 2017! – The creator of Petya ransomware has offered help to victims by using his master key to partially unlock the drives.

How Does Petya.A Ransomware Infect

Very similar to WannaCry ransomware, the ones who are spreading this new variant Petya.A have focused on Worm infection via an exploit kit that is pretty familiar – ETERNALBLUE from the Shadow Brokers leak back in the beginning of 2017. This exploit is believed to be embedded within the worm infection and used in targeted attacks to organizations.

What is interesting about the worm is that it mostly targets Windows 7 systems, after which Windows XP and finally 10 and 8.1 which account to 8% of the attacks so far. It cannot be said who is behind the attack, but the Petya ransomware virus was offered for sale in the deep web with affiliate program. This means that anyone could have purchased and utilized the ransomware for their own profit. The ones who have put Petya ransomware up for sale have even created a user-friendly interface, making it possible for users with little experience to tamper with the ransomware and use it. However, this still leaves the issue with how the worm managed to infect multiple organizations, starting with ones located in Russia as well as Ukraine. The victims of the initial attacks have reported that once a system of the inner networks of their organization was infected, the virus has begun to infect all of the other systems within the network automatically, pointing out to a sophisticated worm infection.

Petya Ransomware – Technical Analysis

Petya.A ransomware is not limited to just one version. The first Petya ransomware attacks were spotted back In the early 2016. The virus displayed a skull and a red screen. After some time, a new variant came out, known as Mischa ransomware, which was a modified Petya variant. Later both variants were combined into one ransomware, that encrypts the MBR and if that fails, the virus encrypts the files on the compromised computer system.

Then, somewhere around December, 2016, a new, stronger version came out, calling itself GoldenEye ransomware, completing the doubts that the names of the viruses are from the James Bond movie – Golden Eye. The virus attacked the same way as Petya and Mischa and is still involved in the 2017 WannaCry like attacks as it was primarily detected in Ukraine.

And now we come up to the current point of the Petya.A attacks. Few months ago, malware researchers have detected a modified variant of Petya ransomware. It was created to attack organizations and it uses a stronger algorithm than the previously employed 16-byte key used by Petya.

The latest variant of Petya ransomware(Petya.A) may just be the previously detected PetrWrap ransomware which targets organizations. This means that it may perform the following activities on a machine, once it has infected it:

1) Initially immediately after infection, the Petya.A ransomware drops a malicious file, named petwrap.exe which causes a BSOD infection (Blue Screen of Death). After this, the virus immediately displays the following message, pretending to be a disk checked (DSKCHK):

2) Then, Petya begins encrypting the Kernel and the Master Boot Record of the infected computer. It has also been detected to attack he master file table (MFT) on NTFS volumes.
3) Upon infection it may contain an embedded public key, called master_pub
4) When each infection takes place, the virus may generate unique keys for every infected device to separate them. These keys are reported to be called ec_session_priv and ec_session_pub
5) The virus uses SHA516 in ECDH mode which contributes to the encryption of the Master Boot Record (MBR).
6) It also encrypts the decryption key, using another function, called ecdh_shared_digest.
7) The virus also generates a unique identifier to separate the single infection.
8) It all ends up with the lockscreen Petya.A sets on boot which has the following message:

“Ooops, your important files are encrypted.

If you see this text, then your files are no longer accessible, because they have been encrypted. Perhaps you are busy looking for a way to recover your
files, but don’t waste your time. Nobody can recover your files without our
decryption service.

We guarantee that you can recover all your files safely and easily. All you
need to do is submit the payment and purchase the decryption key.

Please follow the instructions:

1. Send $300 worth of Bitcoin to following address:
lflz7153HHuxXTuR2R1t78mGSdzafithBUX

2. Send your Bitcoin wallet ID and personal installation key to e-mail
wowsmith1234569posteo.net. Your personal installation key:
{Unique Key}

If you already purchased your key, please enter it below.
Key:_”

How to Try and Recover Drives By Petya.A Ransomware

The previous variant of Petya was indeed decryptable by using a software, called Petya Sector Extractor. Unfortunately, this is not the case with this petya ransomware variant. This is why, we have decided to create theoretical instructions to help you try and recover at least some of your important files. Here is what you will need to have for the instructions:

A screwdriver, corresponding to your desktop/laptop.
A secure computer that is scanned for malware and cleaned and has a proper ransomware protection.
Patience.

First of all, you should choose the safe computer from which to scan your files to be a powerful Windows machine which is also secured. This is why we recommend following these steps to secure it:

1. Download an ransomware and malware protection program.

Spy Hunter scanner will only detect the threat. If you want the threat to be automatically removed, you need to purchase the full version of the anti-malware tool.Find Out More About SpyHunter Anti-Malware Tool / How to Uninstall SpyHunter
2. Download a relevant ransomware protection program.
3. Download a relevant cloud backup program that backups copies of your files on a secure server and even if your computer is affected you will stay protected. For more information you can also check another methods to safely store your data here.

After securing the test PC, you should prepare it for the decryption process which will most likely be lengthy. This is why we recommend changing the power settings so that your decryption computer does not automatically hibernate or sleep while left decrypting the drive.

→ Step 1: Click on the battery icon in your system tray (next to the digital clock) in Windows and then click on More Power Options.
Step 2:The Power options menu will appear. In your power plan click on Change Plan Settings.
Step 3: In your plan’s settings make sure you set “Turn off the display” and “Put computer to sleep” to “Never” from the drop down minutes menu.
Step 4: Click on Save Changes and close it.

Recovery Phase

For the recovery process, we have outlined several often-met drive migration scenarios which can be possible between different computers:

From Laptop to Laptop with no extra components.
From Desktop to Desktop with no extra components.
From Laptop to Desktop with a SATA cable if the Desktop has an outdated chipset.
From Desktop to Laptop with a SATA cable if the Laptop has a newer chipset.

To simplify the process, we recommend you to choose machines that do not require any extra cables or components for the drive to run on them. In case you do not have such possibility, we recommend using an external SATA-USB adapter.

Step 1: Remove battery and power from your laptop. For desktop computers, please remove eliminate the power from the contact.

Step 2: Using the screwdriver, unscrew the case which carries the hard drive. For laptops, you should follow these steps:

Step 3: Remove the hard drive again with the screwdriver. It will look similar to the one on the picture below:

Step 4: Plug-in the hard drive on a secure computer which has an internet connection and Windows installed and screw it in firmly. If connected directly, the hard drive should be detected by the OS as a separate partition, similar to the picture below:

Step 5: After you have connected the drive, you will likely not be able to open it, because it’s sectors are encrypted. However, because only some of the sectors are encrypted, enough to render the drive no longer openable, you may have a chance if you use a data recovery software to recover the files from the drive as you were scanning a lost partition. Most data recovery programs have support for scanning broken partitions, but we recommend you to try the following:

→ Stellar Phoenix Windows Data Recovery

Conclusion and Updates On Petya

We will continue to monitor the situation with Petya ransomware and update with every new variant coming out as we did with the previous Petya variant which was decrypted. Follow this web page or our blog news letter by e-mail for more information to come soon. In the meantime, we strongly advise you to update your Windows systems and secure them properly against malware. To learn more about security your PC and data in the future, we recommend reading the following materials:

→Related:Ransomware Protection Tips

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

How to Remove Petya.A from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove Petya.A

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!

We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".

Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall Petya.A and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"

Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by Petya.A on your computer.

The usually targeted registries of Windows machines are the following:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by Petya.A there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.

Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for Petya.A with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

Download

Malware Removal Tool

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.

3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by Petya.A.

Ransomware infections and Petya.A aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

EaseUS Data Recovery Software

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Windows Mac OS X

Get rid of Petya.A from Mac OS X.

Step 1: Uninstall Petya.A and remove related files and objects

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!

We Recommend To Scan Your Mac with SpyHunter for Mac

Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to Petya.A:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to Petya.A. If you find it, right-click on the app and select “Move to Trash”.

6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to Petya.A. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

Go to Finder.
In the search bar type the name of the app that you want to remove.
Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove Petya.A via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as Petya.A. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Click the button below below to download SpyHunter for Mac and scan for Petya.A:

Download

SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by Petya.A.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

EaseUS Data Recovery Software

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Petya.A FAQ

What is Petya.A ransomware and how does it work?

Petya.A is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does Petya.A ransomware infect my computer?

Via several ways.Petya.A Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of Petya.A is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .Petya.A files?

You can't. At this point the .Petya.A files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .Petya.A files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by Petya.A ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".Petya.A" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .Petya.A files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of Petya.A ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate Petya.A ransomware and then remove it without causing any additional harm to your important .Petya.A files.

Also, keep in mind that viruses like Petya.A ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
Also, check if some of the files that were encrypted it can be re-downloaded from the web.
Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

1 Comment

Nabeela tabu July 3, 2017 at 11:15 am

So can we recover files encrypted by Petra?

Reply ↓

“Oops, Your Important Files Are Encrypted” (Petya.A WannaCry Ransom Virus)