Trojan.Exprez.B

If you are looking for ways to remove Trojan.Exprez.B, then you can find it on this page. Free tools and removal procedure is also included to get rid of the Trojan instantly.

Trojan.Exprez.B is a computer threat that infects files with extensions such as .exe, .doc, and .docx. Trojans of this kind are typically using tricks so that user may install them on the computer. This Threat does not only cause damages to affected files, it may also provide some actions that can lead to system malfunction. It is vital to deal with this Trojan at once before it can spread on files inside the computer.

Damage Level: Medium

Systems Affected: Windows 9x, 2000, XP, Windows Vista

Characteristics
If user executes Trojan.Exprez.B, it will create a copy of itself under Users Application folder. Then it will move this file to Windows directory when user restarts Windows. The Trojan will then search for files with extensions like .exe, .doc, and .docx. It will decrypt these files and affix them with harmful code. Affected files will be renamed to Trojans own unique extension. Here are some examples:
Letter.doc turns into Letter.cod.scr
Note.docx turns into Note.xcod.scr

During diagnostic, it was found that removing the Trojan deactivates the encryption for affected .exe files. Thus, there is no need to decrypt infected files in order to run them. However, all MS Word files needs manual reset of extension name.

Distribution
This kind of Trojan usually spreads through file-sharing networks. In most occasions, Trojan.Exprez.B or other threats of the same kind are embedded into legitimate executable files that users frequently downloads from shared public server. Using an advance technique, it often conceals itself from antivirus software. Spam email message is another channel to distribute the Trojan to unspecified target. It may arrive as an attached file that disguises as item worth opening.

How to Remove Trojan.Exprez.B

Systematic procedures to get rid of the threat are presented on this section. Make sure to scan the computer with suggested tools and scanners.

NOTE: We suggest that you PRINT or BOOKMARK this guide. There are steps that we may have to restart the computer in order to successfully remove the threat.

Step 1 : Run a scan with your antivirus program

1. Remove all media such as Memory Card, cd, dvd, and USB devices. Then, restart the computer and please do the following:

Boot in Safe Mode on Windows XP, Windows Vista, and Windows 7 system
a) Before Windows begins to load, press F8 on your keyboard.
b) It will display the Advanced Boot Options menu. Select Safe Mode.

Start computer in Safe Mode using Windows 8 and Windows 10
a) Close any running programs on your computer.
b) Get ready to Start Windows. On your keyboard, Press and Hold Shift key and then, click on Restart button.
c) It will prompt you with options, please click on Troubleshoot icon.
d) Under Troubleshoot window, select Advanced Options.
e) On next window, click on Startup Settings icon.
f) Lastly, click on Restart button on subsequent window.
g) When Windows restarts, present startup options with numbers 1 - 9. Select "Enable Safe Mode with Networking" or number 5.

Startup Options

h) Windows will now boot on Safe Mode with Networking. Proceed with virus scan as the next step.

2. Once Windows is running under Safe Mode with Networking, open your antivirus program and download the most recent update. This method ensures that your antivirus program can detect even newer variants of Trojan.Exprez.B.

Updating your antivirus software is a one-click process. Please refer to your software manual for complete instructions.

3. Once updating is finished, run a full system scan on the affected PC. After the scan, delete all infected items. If unable to clean or delete, better place the threat in quarantine.

Step 2: Run another test with online virus scanner

Another way to remove Trojan.Exprez.B without the need to install additional antivirus software is to perform a thorough scan with free online virus scanner. It can be found on websites of legitimate antivirus and security provider.

1. Click the button below to proceed to the list of suggested Online Virus Scanner. Choose your desired provider. You can run each scan individually, one at a time, to ensure that all threats will be removed from the computer. This may require plug-ins, add-on or Activex object, please install if you want to proceed with scan.

Online Virus Scan

2. After completing the necessary download, your system is now ready to scan and remove Trojan.Exprez.B and other kinds of threats.
3. Select an option in which you can thoroughly scan the computer to make sure that it will find and delete entirely all infections not detected on previous scan.
4. Remove or delete all detected items.
5. When scanning is finished, you may now restart the computer in normal mode.

Alternative Removal Procedures for Trojan.Exprez.B

Option 1 : Use Windows System Restore to return Windows to previous state

During an infection, Trojan.Exprez.B drops various files and registry entries. The threat intentionally hides system files by setting options in the registry. With these rigid changes, the best solution is to return Windows to previous working state is through System Restore.

To verify if System Restore is active on your computer, please follow the instructions below to access this feature.

Access System Restore on Windows XP, Windows Vista, and Windows 7

a) Go to Start Menu, then under 'Run' or 'Search Program and Files' field, type rstrui.
b) Then, press Enter on the keyboard to open System Restore Settings.

rstrui-win7

Open System Restore on Windows 8 and Windows 10

a) Hover your mouse cursor to the lower left corner of the screen and wait for the Start icon to appear.
b) Right-click on the icon and select Run from the list. This will open a Run dialog box.
c) Type rstrui on the 'Open' field and click on OK to initiate the command.

rstrui-win8

If previous restore point is saved, you may proceed with Windows System Restore. Click here to see the full procedure.

Option 2 : Trojan.Exprez.B manual uninstall guide

IMPORTANT! Manual removal of Trojan.Exprez.B requires technical skills. Deleting system files and registry entries by mistake may result to total disability of Windows system. We advise you to perform a backup of registry before proceeding with this guide.

1. Kill any running process that belongs to Trojan.Exprez.B.

- Press Ctrl+Alt+Del on your keyboard.
- When Windows Task Manager appears, look for Trojan.Exprez.B files (refer to Technical Reference) and click End Process.

End Task

2. Delete all registry entries that belong to this malware.

- Press [Windows Key]+R on your keyboard.
- In the 'Open' dialog box, type regedit and press Enter. This will open registry editor.
- Find and delete the following:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "[random charaters.exe]"
- Close registry editor. Changes made will be save automatically.

Run Regedit

3. Scan the computer with antivirus program.

- Connect to Internet and open your antivirus software. Please update to obtain the latest database and necessary files.
- Restart the computer in Safe Mode using the procedures above.
- Open your anti-virus program and thoroughly run a scan on the computer. Delete/Quarantine all identified threats to remove Trojan.Exprez.B effectively.

4. Delete all files dropped by Trojan.Exprez.B.

- While still in Safe Mode, search and delete malicious files. Please refer to 'Technical Reference'. Make sure that you execute 'End Task' first before deleting the file. Otherwise, the system will not let you perform this action.

Associated Files and Folders:
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About Marco Mathew

Marco Mathew works as Windows Network administrator before establishing precisesecurity.com. Now, Marco is dedicating full-time to help computer users' fight viruses, malware, trojan, worms, adware, and potentially unwanted programs.

1 Comment

  1. AvatarMichael

    Hello

    What do you mean by “During diagnostic, it was found that removing the Trojan deactivates the decryption. Thus, there is no need to encrypt infected files in order to open them. However, all MS Word files needs manual reset of extension name.”

    We are encountering that renaming the file does not make the files usable again.

    Regards,
    Michael

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