How to prevent a b00m ransomware attack

Also Known As: b00m virus
Distribution: Low
Damage level: Severe

b00m ransomware removal instructions

What is b00m?

Belonging to the CryptoJoker ransomware family and discovered by Raby, b00m is one of many different ransomware-type programs. Ransomware is malicious software usually designed to encrypt files. Cyber criminals distribute these programs so they are able to extort money from people by forcing them to pay a ransom (in effect, purchase a decryption tool and/or key). Like most programs of this type, b00m renames all encrypted files. In this case, it adds an email address and a new extension (".b00m"). For example, "1.jpg" becomes "1.jpg.[].b00m". It also creates a text file called "HACKED.txt" containing a ransom message and instructions about how to pay the ransom.

The message states that this ransomware has encrypted all files stored on the computer. To recover them, victims must pay 100 euros in the Bitcoin cryptocurrency. The ransom must be transferred to the Bitcoin wallet address provided. To obtain a decryption tool and key, victims are encouraged to contact b00m developers via the email address. The message must contain a personal ID that is appointed to each victim individually. This can be found at the bottom of the ransom message ("HACKED.txt" file). Victims are informed that there is no other way to decrypt their files. Unfortunately, this information is accurate. Most ransomware-type programs encrypt files with strong encryption algorithms that are impossible to 'crack'. The only way to decrypt locked files is to use tools and/or keys held only by the cyber criminals who developed the ransomware. Note that these people cannot be trusted. There is a strong possibility that sending money (paying the ransom) will give no positive outcome. They might not send any decryption tool/key even if their demands are met. Typically, the only free way to recover files is to restore them from a backup.

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

b00m decrypt instructions

There are many examples of other ransomware-type programs including Moka, Kokoklock, and .cmd. They are all designed to block access to data. Main differences are usually cost of decryption and cryptographic algorithm (symmetric or asymmetric) used to encrypt data. In most cases, decryption without having to contact or pay ransomware developers is impossible, unless the ransomware is not fully developed, contains bugs, flaws, etc. To avoid data and financial loss caused by ransomware, have data backed up and store it on a remote server such as Cloud or unplugged storage device.

How did ransomware infect my computer?

Typically, cyber criminals proliferate ransomware and other malware through emails (spam campaigns), Trojans, untrustworthy software download channels, fake software updaters, or software 'cracking' tools. When they seek to proliferate ransomware through spam campaigns, they send emails that contain attachments or web links that download them. In any case, their main goal is to trick people into opening them. When opened, these files install malware. Examples of common attachments are MS Office and PDF documents, executables (.exe files), archives such as RAR, ZIP, JavaScript files, etc. Trojans are also used to distribute malware. If installed, these programs proliferate (download and install) other malicious programs. Untrustworthy software download sources such as Peer-to-Peer networks (torrent clients, eMule, and so on), freeware download or free file hosting websites, unofficial websites, third party downloaders and other similar channels can be used to proliferate malware. Generally, malicious files are disguised as regular or harmless. People who download and open them, however, infect their computers with malicious software. Fake software updaters infect systems by exploiting bugs/flaws of outdated software or simply by downloading malicious programs rather than the updates. Unofficial activation tools supposedly bypass paid software activation, however, these tools often proliferate malware - they install ransomware, Trojans, or other malicious software.

Threat Summary:
Name b00m virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .b00m
Ransom Demanding Message HACKED.txt
Ransom Amount 100 euros in Bitcoins
Cyber Criminal Contact
Detection Names Avast (Win32:Malware-gen), BitDefender (DeepScan:Generic.Ransom.Hiddentear.A.60BAEE5B), ESET-NOD32 (A Variant Of MSIL/Filecoder.CryptoJoker.C), Kaspersky (Trojan-Ransom.MSIL.Agent.gog), 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.

To eliminate malware infections our security researchers recommend scanning your computer with Spyhunter.
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How to protect yourself from ransomware infections

Files that are attached to irrelevant emails and received from unknown addresses should not be opened. All software and files should be downloaded using official websites and direct download links. The other channels mentioned above should not be trusted. Installed programs should be updated using implemented functions or tools provided by official software developers. Software 'cracking' tools are often designed to install malware and are illegal. Operating systems are safer when there is reputable anti-virus or anti-spyware software installed. Additionally, scan systems with it regularly and remove all detected threats immediately. If your computer is already infected with b00m, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in b00m ransomware text file ("HACKED.txt"):

Hello, my name is CryptoJoker !!

My name is CryptoJoker. I have encrypted all your precious files including images, videos,
songs, text files, word files and e.t.c  So long story short, you are screwed ... but you are lucky
in a way. Why is that ?? I am ransomware that leave you an unlimited amount of time to gather the money
to pay me. I am not gonna go somewhere, neither do your encrypted files.


1. Can i get my precious files back ??

Answer: Ofcourse you can. There is just a minor detail. You have to pay to get them back.

2. Ok, how i am gonna get them back ?

Answer: You have to pay 100 in bitcoin.

3. There isn't any other way to get back my files ?

Answer: Nahhh.

4. Ok, what i have to do then ?

Answer: Simply, you will have to pay 100Ä to this bitcoin address: 34rLmycSxXQQ7Mhz5qFhkrTrovi3LskKQR . When time comes to send me the money, make sure to include your e-mail and your personal ID(you can see it bellow) in the extra information box (it may apper also as 'Extra Note' or 'optional message') in order to get your personal decryption key. It may take up to 6-8 hours to take your personal decryption key.

5. What the heck bitcoin is ?

Answer: Bitcoin is a cryptocurrency and a digital payment system. You can see more information here: . I recommend to use 'Coinbase' or 'Bitcoin Wallet' as a bitcoin wallet, if you are new to the bitcoin-wallet. Ofcourse you can pay me from whatever bitcoin wallet you want, it deosn't really matter.

6. Is there any chance to unclock my files for free ?

Answer: Not really. After 1-2 or max 3 years there is propably gonna be released a free decryptor. So if you want to wait ... it's fine. As i said, i am not gonna go somewhere.

7. What i have to do after getting my decryption key ?

Answer: Simple. Just press the decryption button bellow. Enter your decryption key you received, and wait until the decryption process is done.

Your personal ID: -

Screenshot of files encrypted by b00m (".b00m" extension):

Files encrypted by b00m

b00m ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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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 b00m 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 b00m 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 b00m 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 b00m 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 b00m, 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 b00m 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 as well as 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 b00m 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 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
b00m virus QR code
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