.blower Ransomware

Also Known As: .blower virus
Distribution: Moderate
Damage level: Severe

.blower ransomware removal instructions

What is .blower?

There are plenty of ransomware-type infections and .blower is one these malicious programs. As with most rogue software of this type, it is used to encrypt data and blackmail people who have computers infected by it (by demanding ransom payments). They encourage victims to purchase a decryption tool. Note that this malicious program belongs to the Djvu ransomware family and was discovered by dis. It adds the ".blower" extension to each encrypted file. For example, "1.jpg" becomes "1.jpg.blower". Note that .blower also creates a "_readme.txt" file (a ransom message).

The message within the "_readme.txt" file informs victims that all files (including photos, databases, and other documents) were encrypted with the strongest encryption, which requires a unique key. According to .blower's developers, the only way to decrypt encrypted data is to purchase a decryption tool from them. They offer free decryption of one file as 'proof' that they have a valid tool capable of decryption. To receive this decryption tool, users are encouraged to pay these cyber criminals $980. They offer a 50% discount for those who make contact within 72 hours (the decryption tool would then cost $490). They provide two email addresses for this purpose: blower@india.com and blower@fireman.cc. Note that, even if they have a decryption tool, it is unlikely that they will provide it. In many cases, cyber criminals ignore victims once ransoms are paid/transferred. Unfortunately, they usually encrypt data with cryptography algorithms (symmetric or asymmetric) and thus files cannot be decrypted without using a specific (decryption) tool. In most cases, ransomware victims are encouraged to contact cyber criminals (the developers). There is no information indicating that there might be tools capable of decrypting .blower encryption free of charge. Typically, the best solution in these cases is to use an existing data backup and restore everything from there.

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

.blower decrypt instructions

There are many ransomware-type infections, most of which are very similar. Some other examples include CryptoID, 888, and Cosanostra. Most of these malicious programs have the same functions: to encrypt data, allow developers to make ransom demands, and blackmail victims. The main variables are usually cost of decryption tool (ransom size) and cryptography used for data encryption. Despite any similarities or differences, these programs all encrypt data using cryptographies that are impossible to 'crack' without using a specific tool, unless ransomware is not fully developed or contains bugs/flaws. Unfortunately, only cyber criminals can provide these tools. To avoid data loss caused by such computer infections, maintain data backups and store them on unplugged storage devices or remote servers.

How did ransomware infect my computer?

It is not known exactly how .blower's developers proliferate this malicious program, however, cyber criminals often use email (spam) campaigns, Trojans, dubious software download sources, fake software updating tools and software cracking tools. Spam campaigns are used to proliferate computer infections by sending emails that contain malicious attachments: Microsoft Office documents, PDF files, archive files (like ZIP, RAR), executable files (.exe) and so on. Cyber criminals succeed in infecting computers if people open these attachments. By opening malicious attachments, many users trigger download and installation of ransomware or other malicious programs. Trojans are used to cause chain infections: if a Trojan is installed, it downloads and installs additional malware. Untrustworthy software download sources such as freeware download websites, free file hosting websites, Peer-to-Peer networks (like torrents, eMule and other tools), third party downloaders/installers are often used to present malicious software as legitimate. Any of these tools can cause unintentional installation of computer infections. Fake software updaters cause computer infections by downloading malware rather than the promised (expected) updates or by exploiting outdated software bugs/flaws. Software cracking tools often install malicious programs rather than (illegally) activating software or operating systems.

Threat Summary:
Name .blower virus
Threat Type Ransomware, Crypto Virus, Files locker
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay 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 .blower virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

To prevent computers infections by ransomware (or other high-risk computer infections), download, install, update software and browse the internet carefully. Avoid third party software downloaders/installers or other dubious sources mentioned earlier. Download software using official and trustworthy websites and direct links. Furthermore, avoid unofficial/third party tools to update software. The best way to update software or operating systems is through implemented functions or tools provided by official software developers. Be careful with attachments presented in emails. Avoid opening attachments (or web links) that are presented in emails received from unknown/suspicious addresses or irrelevant messages. Note that activating software or operating systems using software cracking tools is illegal. Furthermore, using them can cause computer infections that might lead to financial loss or other problems. Finally, have reputable anti-spyware/anti-virus software installed and enabled. These tools can detect threats early and prevent them from doing any damage. If your computer is already infected with .blower, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in .blower ransomware text file "_readme.txt" :


Don't worry my friend, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail "Spam" folder if you don't get answer more than 6 hours.

To get this software you need write on our e-mail:

Reserve e-mail address to contact us:

Your personal ID:

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

Files encrypted by .blower

As with most of ransomware from Djvu family, .blower also displays a fake Windows update pop-up during the encryption:

Djvu ransomware family fake update

IMPORTANT NOTE! - Ransomware-type infections from Djvu malware family are designed to add a number of entries to the Windows hosts file. The entries contain URLs of various websites, most of which are related to malware removal. This is carried out with the intention of making users unable to access malware security websites and seek help. Our website (PCrisk.com) is also on the list. Removing these entries, however, is simple - you can find detailed instructions in this article (note that, although the steps are shown in the Windows 10 environment, the process is virtually identical on all versions of the Microsoft Windows operating system).

Screenshot of websites added to Windows hosts file:

Tro Ransomware adding websites to Windows Hosts file

.blower ransomware removal:

Instant automatic removal of .blower virus: 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 .blower virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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 .blower 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 .blower 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 .blower 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 .blower 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 .blower, 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 .blower 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 .blower 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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Removal Instructions in other languages
Malware activity

Global virus and spyware activity level today:

Medium threat activity

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

QR Code
.blower 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 .blower virus on your mobile device.
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Platform: Windows

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