How to remove Bomba ransomware from the operating system?

Also Known As: Bomba virus
Distribution: Low
Damage level: Severe

Bomba ransomware removal instructions

What is Bomba?

Bomba is a piece of malicious software, belonging to the Scarab ransomware family. Systems infected with this malware have their data encrypted and receive payment demands for the decryption tools/software. During the encryption process, all affected flies are appended with the ".bomba" extension. For example, a file originally named something like "1.jpg" would appear as "1.jpg.bomba" - following encryption. Once this process is finished, a ransom note - "HOW TO RECOVER ENCRYPTED FILES.TXT" is dropped into every compromised folder. Additionally, Bomba ransomware disables Windows Task Manager.

The ransom note ("HOW TO RECOVER ENCRYPTED FILES.TXT") informs victims that their data has been encrypted. According to this message, the only way of recovering the files is by purchasing the decryption tools from cyber criminals behind the infection. The note also contains contact details of the criminals - Telegram messenger account username and email address. Before paying, users can test decryption by sending up to three encrypted files. The total file size must not exceed 10 Mb (non-archived) and the test files cannot contain valuable information (e.g. databases, backups, large Excel sheets, etc.). The message ends with warnings, alerting victims that renaming and/or attempting to decrypt the compromised files with third party tools/software - can result in permanent data loss. In many of ransomware attacks, without interference of the cyber criminals responsible - decryption is impossible. It might be, if the malicious program is still in development and/or has bugs (flaws). Regardless of the circumstances, it is strongly advised against meeting the ransom demands. Since often, despite paying - users do not receive the promised decryption tools. Therefore, they experience financial loss and their data remains worthless. To prevent Bomba from further encryptions, it must be eliminated from the operating system. Unfortunately, removal will not restore already encrypted files. The sole viable solution is recovering them from a backup, if one was created prior the infection and was stored in a separate location.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Bomba decrypt instructions (HOW TO RECOVER ENCRYPTED FILES.TXT)

SIGARETASdkkxbhVIVELAG are a few examples of other ransomware-type programs. They are designed to encrypt data and demand ransoms for the decryption. Key differences in-between these programs/infections include - the cryptographic algorithms they use (symmetric or asymmetric) and size of the demanded payment. The latter range between three and four digit sums (in USD). Digital currencies (e.g. cryptocurrencies, pre-paid vouchers, etc.) are typically used for the payments, due to transactions of them being difficult/impossible to trace. To protect data, it is recommended to keep backups in remote servers and/or unplugged storage devices (ideally, in multiple different locations).

How did ransomware infect my computer?

Ransomware and other malware are mainly distributed through spam campaigns, trojans, illegal activation ("cracking") tools, illegitimate updates and dubious download channels. The term "spam campaign" is used to refer to a large scale operation, during which thousands of deceptive/scam emails are sent. These letters have infectious files attached to and/or linked inside them. Malicious files can be in various formats (e.g. PDF and Microsoft Office documents, archive and executable files, JavaScript, etc.) and when they are executed, run or otherwise opened - the infections process is initiated (i.e. malware download/installation begins). Trojans are malicious programs, many of which are capable of causing chain infections. Rather than activate licensed product, illegal activation tools ("cracks") can download/install malware. Fake updaters infect the system by abusing flaws of outdated products and/or by installing malicious software, instead of the promised updates. Untrustworthy download sources (e.g. unofficial and free file-hosting sites, Peer-to-Peer sharing networks and other third party downloaders) - can offer malware for downloading, disguised as or packed with ordinary content.

Threat Summary:
Name Bomba virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .bomba
Ransom Demanding Message HOW TO RECOVER ENCRYPTED FILES.TXT
Cyber Criminal Contact logiteam@protonmail.com and @decryptorbomber (Telegram)
Detection Names BitDefender (DeepScan:Generic.Ransom.Amnesia.B), DrWeb (Trojan.Encoder.26375), ESET-NOD32 (A Variant Of Win32/Filecoder.FS), Kaspersky (HEUR:Trojan-Ransom.Win32.Generic), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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How to protect yourself from ransomware infections?

It is advised against opening suspect and/or irrelevant emails, especially any attachments or links present in them - due to risk of serious system infections. Only official and verified download channels should be used. Additionally, products must be activated and updated with functions/tools provided by genuine developers. Illegal activation ("cracking") tools and third party updaters should not be used, as they commonly proliferate malware. To ensure device and user safety, it is crucial to have a dependable anti-virus/anti-spyware suite installed. Furthermore, this software is to be used for regular system scans and to remove detected threats/issues. If your computer is already infected with Bomba, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Bomba ransomware's text file ("HOW TO RECOVER ENCRYPTED FILES.TXT"):

YOUR FILES ARE ENCRYPTED!
Your personal identifier:
-

Your documents, photos, databases, save games and other important data has been encrypted.
Data recovery requires a decoder.
decryption of files for money
contact us by telegram login @decryptorbomber
contact us by logiteam@protonmail.com
Free decryption as guarantee!
Before paying you can send us up to 3 files for free decryption.
The total size of files must be less than 10Mb (non archived), and files should not contain
valuable information (databases, backups, large excel sheets, etc.).

 
Attention!   
 * Do not rename encrypted files.
 * Do not try to decrypt your data using third party software, it may cause permanent data loss.  
 * Decryption of your files with the help of third parties may cause increased price  
   (they add their fee to our) or you can become a victim of a scam.

Screenshot of files encrypted by Bomba (".bomba" extension):

Files encrypted by Bomba ransomware (.bomba extension)

Bomba ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Bomba virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Bomba ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Bomba ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Bomba are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Bomba, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Bomba ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites, and Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Bomba ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Bomba virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Bomba virus on your mobile device.
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