How to remove Oovb ransomware, Decrypt .oovb files.

What is Oovb virus?

Oovb virus is a ransomware that attacks the victim’s computer by encrypting files and demanding a ransom for decrypting them. The ransomware attack can lead to data loss and financial losses. Oovb encrypts files, renames them by appending the .oovb extension, and creates files named “_readme.txt” containing the ransom demand message. For example, a file named “document.docx” will be renamed to “document.docx.oovb”, a “image.jpg” file to “image.jpg.oovb”, “invoice.pdf” to “invoice.pdf.oovb”, and so on.

QUICK LINKS

• What is Oovb virus?
• Remove Oovb virus (ransomware)
• Decrypt .oovb files
• Restore .oovb files
• Video Guide

Oovb ransomware is a malicious program designed to encrypt files on a victim’s computer. This malware is a new variant of the STOP (Djvu) ransomware. Almost always, this malware penetrates the computer undetected when the user runs files downloaded from unsafe websites. The most common source of infection are cracked games, Windows and Microsoft Office activators, and other similar software.

Upon execution, Oovb copies itself to the Windows system directory, changes some OS settings and collects information about the infected computer. Then the malware tries to establish a connection with its control server. If the connection was established, the Oovb ransomware sends information about the infected computer to the server. The server processes the received information, and then sends the key, which must be used to encrypt files. Such an encryption key is called an online key and this key is unique for every ransomware infection. If the malware was unable to establish a connection with its server, then it uses a fixed key, and this key is the same for all infected computers (so-called ‘offline key’).

The key type is very important because at the moment only files encrypted with the offline key can be decrypted, and only after the key has been obtained by security researchers. Security researchers have already obtained many offline keys for various variants of the STOP ransomware (Djvu).

A file with the extension “oovb” is a file encrypted by the Oovb ransomware. This means that the file is locked, its contents cannot be accessed in any way. If you rename the file, delete its extension, it will not be able to unlock its contents, it will remain encrypted. This is because the malware uses an encryption algorithm with a long key, so it is impossible to find out this key or determine it using an encrypted and unencrypted file. This ransomware encrypts all files located on the computer, which means that files located on local disks and files on connected network storage will be encrypted. Each encrypted file gets a new name, which consists of its old and the “.oovb” extension appended to the right. There is a small exception, the malware does not encrypt files with the name “_readme.txt”, files located in the Windows system directories, as well as files that have the “.dll, .lnk, .bat, ini, .sys” extension. Thus, the following types of files can be encrypted:

.zdb, .lvl, .csv, .xls, .ff, .mov, .mp4, .der, .sr2, .raf, .wbd, .qic, .dazip, .xlsm, .mpqge, .1, .xy3, .pst, .x3f, .psk, .sid, .wpt, .apk, .ibank, .odc, .pdd, .cer, .orf, .xmind, .fos, .litemod, .kdb, .wps, .odt, .xf, .erf, .desc, .bay, .accdb, .ybk, .jpeg, .asset, .hplg, .gdb, .m2, .wn, .xlgc, .arch00, .wmv, .avi, .cas, .p7c, .m4a, .wot, .xls, .py, .wsh, .mdf, .kdc, .x, .wotreplay, .xwp, .pdf, .css, .ppt, .xyw, .wpd, .db0, .mcmeta, .p12, .dba, .wp6, .eps, .cfr, .layout, .wp, .das, .wb2, .raw, .vcf, .zabw, .sav, .0, .cr2, .bc7, .wm, .wpe, .syncdb, .vpp_pc, .menu, .webdoc, .wmo, .big, .jpg, .wpd, .arw, .z3d, .rar, .bkf, .dmp, .pfx, .zip, .m3u, .xdb, .wp5, .png, .wdb, .wma, .z, .xlsx, .wbc, .wpg, .wbz, .yml, .ws, .esm, .xdl, .vfs0, .vtf, .sql, .pptx, .re4, .cdr, .ysp, .tor, .rgss3a, .zif, .zdc, .hvpl, .dcr, .wbm, .mddata, .txt, .xbplate, .ai, .xll, .3dm, .tax, .xpm, .vdf, .mdb, .2bp, .xml, .ntl, .d3dbsp, .yal, .rtf, .pef, .xlsb, .pkpass, .sb, .wgz, .itm, .xlsm, .svg, .itdb, .odb, .pptm, .wsd, .mlx, .mdbackup, .rim, .doc, .bc6, .indd, .hkx, .bkp, .webp, .dng, .map, .snx, .y, .dxg, .nrw, .sidd, .ztmp, .3fr, .docx, .xlsx, .wpb, .lrf, .ltx, .dwg, .wav, .xx, .wbmp, .p7b, .jpe, .upk, .srw, .wps, .dbf, .rb, .itl, .blob, .t13, .srf, .wpw, .iwd, .crt, .rwl, .kf, .fpk, .zw, .vpk, .xxx, .r3d, .ods, .docm, .1st, .forge, .wmd, .wp7, .xyp, .t12, .sis, .mef, .zip, .epk, .qdf, .gho, .xld, .xar, .wire, wallet, .icxs

In directories where there are encrypted files, the Oovb ransomware drops files called “_readme.txt”. These files contain a message from the Oovb authors. The content of all files with this name is the same and does not depend on which directory the file is in.

This file is a ransom demand message. Almost any ransomware leaves a similar message on the infected computer. In this message, the criminals report that the files on the computer are encrypted and demand a ransom in exchange for the key and the decryptor. The Oovb authors demand $980 for a key and a decryptor pair, but at the same time they promise to reduce the ransom by half if the ransom is paid within 72 hours. To demonstrate to the owner of an infected computer that encrypted files can be decrypted, attackers offer the victim to send one encrypted file to the address specified in the ransom request. Attackers promise to decrypt this file for free.

The full text of the ransomnote is:

ATTENTION!

Don’t worry, you can return all your files!
All your files like pictures, 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:
https://we.tl/t-6g0MALAb7E
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” or “Junk” folder if you don’t get answer more than 6 hours.

To get this software you need write on our e-mail:
support@bestyourmail.ch

Reserve e-mail address to contact us:
datarestorehelp@airmail.cc

Your personal ID:
0552xxxxxxxx

According to the security researchers, the Oovb ransomware uses a strong encryption algorithm and therefore it is impossible to decrypt .oovb files without a key. Fortunately, there is a Oovb File Decrypt Tool that can decrypt files, but only if the files are encrypted with an offline key and the key itself has already been found. Moreover, our team has developed several methods, each of which gives a chance to restore the contents of encrypted files. In order not to miss any important part of this manual, we recommend that you open it in your smartphone or bookmark this page.

Threat Summary

Name	Oovb ransomware, Oovb file virus
Type	Filecoder, Crypto malware, File locker, Ransomware, Crypto virus
File extension	.oovb
Ransom note	_readme.txt
Contact	support@bestyourmail.ch, datarestorehelp@airmail.cc
Ransom amount	$490 or $980 in Bitcoins
Detection Names	RansomX-gen [Ransom], Win.Malware.Azorult-9949206-0, VHO:Trojan.Win32.Convagent.gen, ML/PE-A, Trojan-Spy.MSIL.Agent, Ransom:Win32/StopCrypt.SL!MTB, Malicious.high.ml.score, Ransom.Stop.P5, Trojan.Win32.Save.a
Symptoms	Unable to open files. You get an error message like ‘Windows can’t open this file’, ‘How do you want to open this file’. Files named such as ”, ‘#_README_#’, ‘_DECRYPT_’ or ‘recover’ in each folder with at least one encrypted file.. Ransom demanding message on your desktop.
Distribution ways	Phishing email scam that attempts to scare users into acting impulsively. Drive-by downloading (when a user unknowingly visits an infected webpage and then malicious software is installed without the user’s knowledge). Social media, such as web-based instant messaging programs. Suspicious websites.
Removal	Oovb ransomware removal guide
Decryption	Oovb File Decrypt Tool
Recovery	Oovb File Recovery Tools

How to remove Oovb ransomware

Before you start decrypting or recovering .oovb files, you need to remove Oovb ransomware and its autostart entries. This must be done since otherwise the ransomware may re-encrypt the restored files. You can stop the ransomware from working, as it is not difficult to do. Another option is to perform a full system scan using free malware removal tools capable of detecting and removing ransomware infection.

It is very important to scan the computer for malware, as security researchers found that spyware could be installed on the infected computer along with the Oovb ransomware. Spyware is a very dangerous security threat as it is designed to steal the user’s personal information such as passwords, logins, contact details, etc. If you have any difficulty removing the Oovb virus, then let us know in the comments, we will try to help you.

To remove Oovb ransomware, follow the steps below:

1. Kill Oovb virus
2. Disable Oovb Start-Up
3. Delete Oovb Task
4. Remove Oovb virus

Kill Oovb virus

Press CTRL, ALT, DEL keys together.

Click Task Manager. Select the “Processes” tab, look for something suspicious that is the Oovb ransomware then right-click it and select “End Task” or “End Process” option. If your Task Manager does not open or the Windows reports “Task manager has been disabled by your administrator”, then follow the guide: How to Fix Task manager has been disabled by your administrator.

It is not difficult to detect a process related to the Oovb ransomware. When looking for a malicious process, pay attention to the process icon and its name. Most often, this ransomware has a process name in the following format: 4-characters.tmp.exe or 4-characters.exe. For example: 7533.tmp.exe, A4b1.exe, CD15.tmp.exe, 19b2.exe. The process name can also contain “(32 bit)”. If you do not find a process with a similar name in the list of processes, then most likely the Oovb ransomware has finished working. But keep in mind, if you do not remove the ransomware autostart entries, as demonstrated below, and do not delete its file, then after a while it may start again, and if it finds unencrypted files, immediately encrypt them.

Disable Oovb Start-Up

Select the “Start-Up” tab, look for something similar to the one shown in the example below, right click to it and select Disable.

Close Task Manager.

Delete the Oovb ransomware Task

Type “Task Scheduler” in the search bar. Click Task Scheduler app in the search results. Click “Task Scheduler Library” in the left panel. On the right panel, right-click to “Time Trigger Task” and select Delete.

Close Task Scheduler.

Remove Oovb virus

Run Task Manager and select the “Start-Up” tab. Right click to the Oovb ransomware Start-Up entry and select Open File Location as shown below.

A directory containing one file will open in front of you, this file is the Oovb virus. It needs to be removed. If you try to delete it immediately, then you will not succeed, since this file is protected from deletion.

To delete this file, you need to do the following. Right-click on the file, select Properties. In the window that opens, select Security tab. Next, click the Advanced button below. A window will open as shown in the following example.

Click Disable inheritance. In the Block inheritance dialog box that opens, select the first item (Convert inherited permissions…) as shown below.

In the Permission entries list, select “Deny Everyone”, click Remove button and then OK. Close the file properties window. You should now be able to remove Oovb virus. Right-click on the file and select Delete.

Scan computer for malware

We recommend using MalwareBytes which will completely remove the ransomware from your computer. This tool is an advanced malicious software removal program created by (c) Malwarebytes lab. It uses the world’s most popular antimalware technology. MalwareBytes Antimalware is able to help you remove ransomware, PUPs, trojans, worms, adware, toolbars, and other security threats from your computer for free.

MalwareBytes Anti-Malware can be downloaded from the following link. Save it on your Desktop.

When the download is complete, close all software and windows on your personal computer. Open a directory in which you saved it. Double-click on the icon that’s named MBSetup such as the one below.

When the install begins, you will see the Setup wizard that will help you install Malwarebytes on your computer.

Once installation is done, you will see window such as the one below.

Now press the “Scan” button to perform a system scan with this tool for the Oovb ransomware and other security threats. This procedure can take quite a while, so please be patient. While the MalwareBytes program is scanning, you can see number of objects it has identified as threat.

When the scan get completed, it will display the Scan Results. When you’re ready, press “Quarantine” button.

Malwarebytes will now move the selected security threats to the Quarantine. After the process is complete, you may be prompted to restart your computer.

Download Kaspersky virus removal tool on your personal computer from the link below.

Once the downloading process is done, double-click on the Kaspersky virus removal tool icon. Once initialization process is finished, you’ll see the KVRT screen as on the image below.

Click Change Parameters and set a check near all your drives. Click OK to close the Parameters window. Next click Start scan button to perform a system scan with this utility for the Oovb ransomware virus and other known infections. When a threat is detected, the number of the security threats will change accordingly.

Once Kaspersky virus removal tool has completed scanning, Kaspersky virus removal tool will create a list of malicious software and ransomware like below.

Review the results once the utility has complete the system scan. If you think an entry should not be quarantined, then uncheck it. Otherwise, simply press on Continue to start a cleaning task.

How to decrypt .oovb files

All files with .oovb extension are encrypted and the only way to access their contents is to decrypt them. To decrypt .oovb files, you need to use a unique key and decryptor. As we said above, Emsisoft company was able to create a decryptor and found a way in some cases to determine the key that was used to encrypt the files. This helps ransomware victims to decrypt .oovb files for free.

To decrypt .oovb files, use Oovb File Decrypt Tool

• Download Oovb File Decrypt Tool from the following link.
  STOP Djvu decryptor
• Scroll down to ‘New Djvu ransomware’ section.
• Click the download link and save the decrypt_STOPDjvu.exe file to your desktop.
• Run decrypt_STOPDjvu.exe, read the license terms and instructions.
• On the ‘Decryptor’ tab, using the ‘Add a folder’ button, add the directory or disk where the encrypted files are located.
• Click the ‘Decrypt’ button.

Oovb File Decrypt Tool is a free tool that can decrypt files that were encrypted with an offline key, as Emsisoft found a way to find this key. Unfortunately, files encrypted with an online key cannot yet be decrypted. The online key is unique to each infected computer, and at the moment there is no way to find this key. Of course, criminals have this key, but we do not think that paying a ransom is a way to decrypt .oovb files. In the case when the files are encrypted with an online key, there is a chance to restore the encrypted files using alternative methods, which are described below.

How to find out which key was used to encrypt files

Below we show two ways to help you determine what type of key was used to encrypt the files. This is very important, since the type of key determines whether it is possible to decrypt .oovb files for free. We recommend using the second method, as it is more accurate.

Find out the type of key using ‘_readme.txt’ file

• Open the ransom demand message (‘_readme.txt’ file).
• Scroll down to the end of the file.
• There you will see a line with the text ‘Your personal ID’.
• Below is a line of characters that starts with ‘0552’ – this is your personal id.

Find out the type of key using ‘PersonalID.txt’ file

• Open disk C.
• Open directory ‘SystemID’.
• Open file named ‘PersonalID.txt’. This file lists ‘Personal ID’s that match the keys that the virus used to encrypt files.

The ‘Personal ID’ is not a key, it is an identifier related to a key that was used to encrypt files. If the ID ends with ‘t1’, then the files are encrypted with an offline key. If the ID does not end with ‘t1’, Oovb ransomware virus used an online key. If you could not figure out how to determine which key was used to encrypt files, then we can help. Just write a request here or in the comments below.

Oovb File Decrypt Tool : “No key for New Variant online ID”

If, when you try to decrypt .oovb files, Oovb File Decrypt Tool reports:

No key for New Variant online ID: *
Notice: this ID appears to be an online ID, decryption is impossible

It means that your files are encrypted with an ‘online key’ and their decryption is impossible, since only the oovb authors have the key necessary for decryption. In this case, you need to use alternative methods listed below to restore the contents of encrypted files.

Oovb File Decrypt Tool : “No key for New Variant offline ID”

If, during decryption of .oovb files, Oovb File Decrypt Tool reports:

No key for New Variant offline ID: *t1
Notice: this ID appears be an offline ID, decryption MAY be possible in the future.

It means the following: your files are encrypted with an ‘offline key’, but the key itself has not yet been obtained by security researchers, in this case, you need to be patient and wait a while, in addition, you can also use alternative ways for recovering encrypted data.

If for some reason you were unable to decrypt the encrypted files, then We recommend to follow the news on our Facebook or YouTube channels. So you ‘ll know right away that it ‘s possible to decrypt .oovb files.

This video step-by-step guide will demonstrate How to remove Oovb virus, Decrypt/Recover .oovb files.

How to restore .oovb files

If your files are encrypted with .oovb extension, then there is a chance that you can recover the files without decryption. We recommend using PhotoRec and ShadowExplorer that are designed to find and recover lost and deleted data. Mostly such programs are paid, but these tools can restore your files for free. Each of these tools has helped many times to recover files after ransomware infection in what would seem to be the most hopeless cases. We want to remind you that before you try to recover files, you need to scan your computer for ransomware using free malware removal tools. It is very important to find the Oovb virus and completely remove it.

Use ShadowExplorer to recover .oovb files

A free utility called ShadowExplorer is a simple way to use the ‘Previous Versions’ feature of Microsoft Windows 10 (8, 7 , Vista). You can restore photos, documents and music encrypted by the Oovb ransomware from Shadow Copies for free.

Please go to the following link to download the latest version of ShadowExplorer for Microsoft Windows. Save it directly to your Windows Desktop.

When downloading is complete, extract the downloaded file to a directory on your computer. This will create the necessary files as shown on the screen below.

Run the ShadowExplorerPortable program. Now choose the date (2) that you want to recover from and the drive (1) you want to recover files (folders) from as shown on the screen below.

On right panel navigate to the file (folder) you want to restore. Right-click to the file or folder and click the Export button like the one below.

And finally, specify a folder (your Desktop) to save the shadow copy of encrypted file and click ‘OK’ button.

This video step-by-step guide will demonstrate How to recover encrypted files using Shadow Explorer.

Restore .oovb files with PhotoRec

The last chance to restore encrypted files to their original state is using data recovery tools. We recommend a free tool called PhotoRec. It has all the necessary functions to restore the contents of encrypted files. It helped many victims recover data when it seemed like there was no more hope.

Download PhotoRec on your computer from the following link.

When downloading is finished, open a directory in which you saved it. Right click to testdisk-7.0.win and choose Extract all. Follow the prompts. Next please open the testdisk-7.0 folder as on the image below.

Double click on qphotorec_win to run PhotoRec for MS Windows. It’ll show a screen as shown on the image below.

Select a drive to recover like below.

You will see a list of available partitions. Choose a partition that holds encrypted files as displayed in the following example.

Click File Formats button and specify file types to restore. You can to enable or disable the recovery of certain file types. When this is complete, click OK button.

Next, press Browse button to select where restored personal files should be written, then press Search. We strongly recommend that you save the recovered files to an external drive.

Count of restored files is updated in real time. All restored files are written in a folder that you have chosen on the previous step. You can to access the files even if the restore process is not finished.

When the recovery is finished, click on Quit button. Next, open the directory where restored files are stored. You will see a contents as shown in the figure below.

All recovered photos, documents and music are written in recup_dir.1, recup_dir.2 … sub-directories. If you are searching for a specific file, then you can to sort your recovered files by extension and/or date/time.

This video step-by-step guide will demonstrate How to recover encrypted files using PhotoRec.

How to protect your PC from Oovb ransomware

Most antivirus applications already have built-in protection system against the ransomware. Therefore, if your computer does not have an antivirus program, make sure you install it. As an extra protection, run the HitmanPro.Alert. All-in-all, HitmanPro.Alert is a fantastic tool to protect your PC from any ransomware. If ransomware is detected, then HitmanPro.Alert automatically neutralizes malware and restores the encrypted files. HitmanPro.Alert is compatible with all versions of MS Windows operating system from MS Windows XP to Windows 10.

Please go to the following link to download HitmanPro Alert. Save it on your Desktop.

Once the downloading process is finished, open the folder in which you saved it. You will see an icon like below.

Double click the HitmanPro Alert desktop icon. After the utility is started, you will be displayed a window where you can choose a level of protection, as shown on the screen below.

Now press the Install button to activate the protection.

To sum up

This guide was created to help all victims of the Oovb ransomware virus. We tried to give answers to the following questions: how to remove ransomware; how to decrypt .oovb files; how to recover encrypted files; what is an online key and what is an offline key. We hope that the information presented in this manual has helped you.

If you have questions, then write to us, leaving a comment below. If you need more help with Oovb related issues, go to here.