BitStak Ransomware - Remove It and Restore .bitstak Encrypted Files - How to, Technology and PC Security Forum

by Ventsislav Krastev | July 8, 2016 | 0 Comments file-encryption, malware, Windows

Threat Summary BitStak BitStak Ransomware – Spreading Methods BitStak Ransomware – Activity Overview BitStak Ransomware – Removal and File Restoration

The virus has appeared which uses a very strong encryption to encode files of infected computers. The virus is known as BitStak Ransomware, and it demands from affected users to make a payoff of roughly 50 US dollars in BitCoins (~0.08BTC). All users who have been affected by the BitStak Ransomware, are strongly advised not to pay any ransom money and instead focus on removing this malware from their computers. A preferable way for removal and file restoration you will find if you read this article thoroughly.

Update! According to Softpedia researchers, there has been a free decryptor developed which unlocks files encrypted by BitStak Ransomware. More information you can find here.

Threat Summary

Name	BitStak
Type	Ransomware
Short Description	The malware encrypts users’ files asking the sum of approximately 50 US dollars for decryption.
Symptoms	The user may witness ransom message set as a wallpaper. Files no longer accessible with changed names and an added .bitstak file extension to them.
Distribution Method	Via an Exploit kit, drive-by download or a malicious JavaScript
Detection Tool	See If Your System Has Been Affected by malware Download Malware Removal Tool
User Experience	Join our forum to Discuss BitStak Ransomware.
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.

BitStak Ransomware – Spreading Methods

To be redistributed and infect as many user PCs as possible, BitStak Ransomware may use spam e-mails that may have different malicious tools. One strategy is to have malicious web links which can redirect to unsafe sites that may cause the infection via a drive-by download. Another version is if the spam e-mail has a malicious e-mail attachment which may contain either a malicious JavaScript or a malicious Exploit Kit that can infect the victim’s computer. Usually, the malicious files may be downloaded via an obfuscated program, which is concealed from various antivirus programs that may reside on the victim’s computer. This is why some attachments of BitStak Ransomware may be in archives as well.

BitStak Ransomware – Activity Overview

As soon as it has been activated on the victim’s PC, BitStak may create a malicious executable that may have different names and be situated in key Windows directories, for example:

After creating its malicious executable(s), BitStak may use the Windows Registry Editor to add malicious registry entries in it. This may be done for the virus to run on Windows boot and start encrypting files. The following keys may be targeted by BitStak:

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

As soon as it runs on startup, BitStak Ransomware may target the following folders for encryption:

%Program Files%
%Program Files (x86)%
%AppData%
%Roaming%
%Documents%
%Downloads%
%Videos%
%Music%
%Pictures%
%Desktop%

BitStak Ransomware has also been reported to detect and encrypt every file of the following type, if existing:

.txt, .doc, .exe, .dat, .bat, .vb, .zip, .7z, .rar, .jar, .mp3, .wav, .save, .mp4, .cfg, .flv, .php, .com, .db, .bin, .reg Source: Id-ransowmare.blogspot.bg

Not only this, but BitStak Ransomware also adds the .bitstak file extension and in addition to that changes the names of the encrypted files with alpha-numerical sequence, for example, if the original file is New Text Document.txt, the encrypted file is Z8932h3.bitstak

After doing this, BitStak uses a picture which it may set as a wallpaper on the infected machine. The picture has the following ransom message:

→ “Your all files are locked and encrypted with a strong encryption method. You cannot get your files back without paying. We expect you to make a payment in 3 days, or your files will be permanently deleted.
Your all files are locked. To release your files, you need to pay 40(eur) fee using Bitcoin as a payment method. If you have any external hard-drives plugged, remember to plug them before restoring or you won’t be able to restore them later.
Amount
40.00 EUR / 0.07867 BTC or…
45.464 USD / 0.07867 BTC
Bitcoin Address
{cyber-criminals-bitcoin-address-here}
Or pay with Blockchain mobile app…
Verify your payment so you can get your files back.
Already paid? Verify now to restore your files.”

This is one of the few ransomware viruses that allow payment via a Blockchain mobile app. This is very clever because the payment is faster and easier as well. Cyber-criminals behind BlockChain Ransomware have really thought this through. Despite the offer, we strongly advise you not to pay the ransom fee and read our proposals for removal and file restoration below.

BitStak Ransomware – Removal and File Restoration

To remove BitStak, we advise you to use the instructions below. They are divided on manual and automatically based on how much experience you have with the removal of malware. In any case, we advise you to use the Automatic options, because for obvious reasons:

It will remove other malware as well.
All BitStak files and registry entries will be detected and permanently removed without any damage to the encrypted files.
Your PC should be protected in the future from threats and unwanted programs and e-mails.

If you wish to restore your files, encrypted by BitStak for the moment decryptor has not been released. However, be advised that waiting for a decryptor to be developed by researchers is a way better choice than paying any ransom money to criminals and supporting their malicious activity this way. In the mean time we also advise you to check for backups, try system restore and data restoration software as well as Kaspersky’s free decryptors as well. You can find instructions for them if you check step “3. Restore files encrypted by BitStak” below.

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 BitStak from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove BitStak

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 BitStak 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 BitStak 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 BitStak 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 BitStak 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.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Get rid of BitStak from Mac OS X.

Step 1: Uninstall BitStak 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 BitStak:

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 BitStak. 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 BitStak. 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 BitStak 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 BitStak. 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.

Step 2: Scan for and remove BitStak files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as BitStak, the recommended way of eliminating the threat is by using an anti-malware program. SpyHunter for Mac offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.

Click the button below below to download SpyHunter for Mac and scan for BitStak:

Download

SpyHunter for Mac

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Remove BitStak from Google Chrome.

Step 1: Start Google Chrome and open the drop menu

Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"

Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.

Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Erase BitStak from Mozilla Firefox.

Step 1: Start Mozilla Firefox. Open the menu window

Step 2: Select the "Add-ons" icon from the menu.

Step 3: Select the unwanted extension and click "Remove"

Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Uninstall BitStak from Microsoft Edge.

Step 1: Start Edge browser.

Step 2: Open the drop menu by clicking on the icon at the top right corner.

Step 3: From the drop menu select "Extensions".

Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.

Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Remove BitStak from Safari.

Step 1: Start the Safari app.

Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.

Step 3: From the menu, click on "Preferences".

Step 4: After that, select the 'Extensions' Tab.

Step 5: Click once on the extension you want to remove.

Step 6: Click 'Uninstall'.

A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the BitStak will be removed.

How to Reset Safari
IMPORTANT: Before resetting Safari make sure you back up all your saved passwords within the browser in case you forget them.

Start Safari and then click on the gear leaver icon.

Click the Reset Safari button and you will reset the browser.

Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer Stop Push Pop-ups

Eliminate BitStak from Internet Explorer.

Step 1: Start Internet Explorer.

Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'

Step 3: In the 'Manage Add-ons' window.

Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.

Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.