BI_D Ransomware

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

BI_D ransomware removal instructions

What is BI_D?

First discovered by malware security researcher, Michael Gillespie, BI_D is a new variant of high-risk ransomware called LockCrypt. Immediately after infiltration, BI_D encrypts most stored files (thereby making them unusable) and appends filenames with the " [ id-[victim's_ID].BI_D" extension. For example, "sample.jpg" might be renamed to a filename such as "sample.jpg id-iK+mYICIYCIU.BI_D". Following successful encryption, BI_D creates a text file ("How to Restore Files.txt") and places a copy in every existing folder.

As usual, the new text file contains a message stating that data is encrypted and that victims must pay for decryption. To do this, they must contact BI_D's developers via an email address provided. They are also permitted to attach up to three selected files, which are decrypted and returned as 'proof' that restoring data is possible. No additional information is provided. Therefore, it is currently unknown whether BI_D uses symmetric or asymmetric cryptography. In any case, a unique key (generated individually for each victim) is necessary to restore data. All keys are stored on a remote server controlled by BI_D's developers. This gives cyber criminals a significant advantage and an opportunity to blackmail victims. To receive their keys, victims must transfer a specific sum in the Bitcoin cryptocurrency to the developer's wallet. The cost is not specified - developers provide these details via email, however, in most cases they demand $500-1500 in Bitcoins, Monero, or another cryptocurrency. Regardless of the cost, do not pay. Research shows that many victims are ignored after submitting payments. Strictly speaking, paying gives no positive result and you will be scammed. Therefore, we strongly advise you to ignore all requests to contact these people or submit any payments. There are currently no tools capable of restoring data encrypted by BI_D free of charge and you can only restore everything from a backup.

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

BI_D decrypt instructions

BI_D shares many similarities with Insta, CRYBrazil, DiskDoctor, OpsVenezuela, and dozens of other ransomware-type viruses. Research shows that all have identical behavior (they encrypt data and demand ransom payments) even though they are developed by different parties. There are often just two major differences: 1) size of ransom, and; 2) type of encryption algorithm used. Unfortunately, most ransomware viruses employ algorithms that generate unique decryption keys (for example, RSA, AES, and similar). Therefore, unless the malware is still in development or there is a bug/flaw (e.g., the key is hard-coded, stored locally, etc.), restoring data without involvement of developers (contacting these people is not recommended) is impossible. This is one of the main reasons why you should maintain regular data backups, however, remember to store them on an unplugged storage device (e.g., external hard drive, Flash drive or similar) or remote server (e.g., Cloud). If not, backups are encrypted together with regular files.

How did ransomware infect my computer?

Ransomware-type viruses are proliferated in various ways, however, in most cases, developers use spam emails (malicious attachments), peer-to-peer (P2P) networks (e.g., torrents, eMule, etc.), unofficial software download sources (freeware download websites, free file hosting sites, and similar), fake software updaters, and trojans. Malicious attachments typically come in the format of JavaScript files or MS Office documents. Once opened, these files execute scripts designed to download and install malware. P2P networks and other third party download sources distribute malware by presenting it as legitimate software. Users are tricked into downloading and installing viruses. Fake updaters infect the system by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than updates. Trojans are probably the simplest of all - most do nothing other than open 'backdoors' for other viruses to infiltrate the system. In summary, the main reasons for computer infections are poor knowledge and careless behavior.

Threat Summary:
NameBI_D virus
Threat TypeRansomware, Crypto Virus, Files locker
SymptomsCan'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 methodsInfected email attachments (macros), torrent websites, malicious ads.
DamageAll 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 BI_D virus our malware researchers recommend scanning your computer with Spyhunter.
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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 ransomware infections, pay close attention when browsing the Internet and downloading/installing/updating software. Think twice before opening email attachments. If files seem irrelevant or have been received from a suspicious email address, do not open them and delete the email immediately. You are strongly advised to download your software from official sources only (using direct download links), rather than third party download/installation tools. These tools often include rogue software, and thus should never be used. The same rule should be followed when updating software. Keeping installed applications up-to-date is also paramount, but use implemented update functions or tools provided by the official developer only. Having a reputable anti-virus/anti-spyware suite installed and running is paramount. The key to computer safety is caution.

Text presented in BI_D ransomware text file :

Important !!!
Your personal id -
Warning: all your files are infected with an unknown virus.
To decrypt your files, you need to contact at
The decoder card is received by bitcoin.
You can buy bitcoins from the following links://
Do not try to restore files your self, this will lead to the loss of files forever
You can send us 2-3 encoded files.
And attach to the letter a file from the folder c:\Windows\DECODE.KEY for testing, we will return them to you for FREE

"search files" pop-up displayed by BI_D ransomware:

BI_D search files pop-up

Screenshot of files encrypted by BI_D (" [ id-[victim's_ID].BI_D" extension):

Files encrypted by BI_D

BI_D ransomware removal:

Instant automatic removal of BI_D 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 BI_D 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 BI_D 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 BI_D 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 BI_D 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 BI_D 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 BI_D, 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 BI_D 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 BI_D 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 virus and spyware activity level today:

Medium threat activity

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

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

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