Protect your computer from infection by Yoba ransomware

Also Known As: Ferrlock ransomware
Distribution: Low
Damage level: Severe

Yoba ransomware removal instructions

What is Yoba?

Discovered by Alex Svirid, Yoba is categorized as ransomware. Ransomware-type programs are used to extort money from people with infected computers. They are designed to encrypt files and prevent access unless victims pay the ransom. Like most programs of this type, Yoba renames encrypted files and creates a ransom message. The ransomware also renames files by adding an email address and the ".yoba" extension to the filenames. For example, "1.jpg" might be renamed to "1jpg.[].yoba". The ransom message can be found in the text file named "!=How_recovery_files=!.txt".

To decrypt files, victims are instructed to email the code (a random text string provided in the ransom message) to Further information (instructions and details) are supposedly provided after contacting Yoba developers. Typically, cyber criminals ask to be paid in a cryptocurrency (such as Bitcoin) and promise to send decryption tools and/or keys after payment. Note that only ransomware developers have the tools that can decrypt victims' data. Therefore, most victims have two choices: lose their data or pay the ransom. Despite this, ransomware developers often do not send tools or keys, even if their ransom demands are met. People who trust them risk financial and data loss. The only safe way to recover files is to restore them from a backup, however, this is only possible if the data was backed prior to the ransomware infection.

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

Yoba decrypt instructions

Yoba is one of many ransomware-type programs. Other examples are Arsium, Masok, and Junior. Typically, they encrypt files with strong encryptions and create ransom messages and/or display ransom messages with instructions about how to purchase decryption keys/tools. Common differences are cost of decryption tool/key and cryptographic algorithm (symmetric or asymmetric) used to lock files. Encryptions are often impossible to 'crack' - the only way to unlock data is via tools held only by specific ransomware developers. The best way to avoid data loss caused by ransomware is to have data backed up. Store backups on a remote server or unplugged storage device.

How did ransomware infect my computer?

Most cyber criminals proliferate ransomware through spam campaigns, trojans, unofficial updating, activation (software 'cracking') tools and untrustworthy file/software download channels. They use spam campaigns to trick people into installing malware (including ransomware) through files that are attached to emails that they send. Typically, malicious software is installed when recipients open the received file/attachment. Examples of files that cyber criminals attach are Microsoft Office documents, JavaScript files, executables (such as .ex files), PDF documents and archive files such as ZIP, RAR, and so on. Trojans are malicious programs that are also used to proliferate ransomware, however, this is possible only if a trojan is installed. Once installed, it downloads and installs other malware (causes a chain infection). Fake (third party) updating tools infect systems by downloading and installing malicious programs rather than updating installed software, or by exploiting bugs/flaws of installed software that is out-of-date. Unofficial activation tools are used to avoid payment for activation of licensed software, however, they can be designed to proliferate and install ransomware (or other malware). Examples of dubious download sources are unofficial web pages, freeware download or free file hosting websites, Peer-to-Peer networks such as torrent clients, eMule, third party downloaders, installers, and so on. People who use these sources risk downloading malicious files rather than legitimate and harmless files and software. When opened, these rogue files install malware.

Threat Summary:
Name Ferrlock ransomware
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .yoba
Ransom Demanding Message !=How_recovery_files=!.txt
Cyber Criminal Contact
Detection Names Avast (FileRepMalware), BitDefender (DeepScan:Generic.Ransom.GarrantDecrypt.B.0C4B3F3C), ESET-NOD32 (A Variant Of Generik.HXMKTFE), Kaspersky (Trojan.Win32.DelShad.aly), Full List Of Detections (VirusTotal)
Rogue Process Name System Component (32-bit)
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 Ferrlock ransomware 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?

Attachments or web links sent via irrelevant emails and received from unknown, suspicious addresses cannot be trusted. Cyber criminals disguise these emails as 'important and legitimate' - they often use names of well-known companies. Third party 'cracking' (activation) tools should not be used, since they are illegal and often cause computer infections. All installed software should be updated through implemented functions and tools designed by official software developers. The safest way to download software and files is via official websites. Do not trust the dubious sources mentioned above. Use a reputable anti-virus or anti-spyware suite and scan the operating system with it regularly. If your computer is already infected with Yoba, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Yoba ransomware text file ("!=How_recovery_files=!.txt"):

Do you want decrypt files?
Send us this code:

Screenshot of files encrypted by Yoba (".yoba" extension):

Files encrypted by Yoba

Screenshot of Yoba malicious process ("System Component") in Task Manager:

yoba runs a process in task manager called system component 

Yoba ransomware removal:

Instant automatic removal of Ferrlock ransomware: 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 Ferrlock ransomware. 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 Yoba 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 Yoba 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 Yoba 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 Yoba 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 Yoba, 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 Yoba 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 Yoba 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
Ferrlock ransomware 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 Ferrlock ransomware on your mobile device.
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Platform: Windows

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