Trojan:MSIL/CryptBot!MSR refers to an extremely dangerous computer threat that has been designed to block users from accessing their files. Consequently, they must pay the ransom request in order to regain access to the files, which has been encrypted by a sophisticated method. That is actually the intention of Trojan:MSIL/CryptBot!MSR, to force victims into paying the ransom demand in exchange for decryption tool that is required in restoring the encrypted data back to original format.

Threat Behavior

Trojan:MSIL/CryptBot!MSR spreads the same way a common computer virus does. However, spam emails are observed as the primary channel that attackers use for sending thousands of copies of viruses every day. Trojan:MSIL/CryptBot!MSR approaches the computer as a suspicious email letter masking be originating from the legitimate business. After the addressee has opened the attached file, Trojan:MSIL/CryptBot!MSR launches the attack sequence. It first drops the virus code and then communicates with a command and control server for instructions.

After Trojan:MSIL/CryptBot!MSR gets the key and the attacker’s instructions, it starts encrypting the files. In many cases, Trojan:MSIL/CryptBot!MSR adds a suffix string to the encrypted data. It also leaves a ransom note which is often in text, html, or desktop wallpaper.


When Trojan:MSIL/CryptBot!MSR enters the target computer, it makes a copy of the virus on Windows system folder. Then it adds a registry entry to automate virus loading on every Windows boot. At the time that Trojan:MSIL/CryptBot!MSR is active, it starts to carry out various malicious actions, including encrypting of vital files, which is the main purpose of this virus.

How to remove Trojan:MSIL/CryptBot!MSR?

To totally remove Trojan:MSIL/CryptBot!MSR from the computer and get rid of relevant virus and trojan, please execute the procedures as stated on this page. Make sure that you have completely scan the system with suggested malware removal tools and virus scanners.

Remove Trojan:MSIL/CryptBot!MSR Instantly

To instantly remove Trojan:MSIL/CryptBot!MSR, we suggest that you scan the infected computer with this powerful anti-malware tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Trojan:MSIL/CryptBot!MSR or similar attack, you can activate Malwarebytes to have real-time scanning and complete defense against all forms of threats.

1. Download Malwarebytes Anti-Malware from the link below. Save the file on your hard drive.

2. Once the download completes, double-click on the file MBSetup.exe to run the program.

3. Select desired installation package whether for Personal Computer or Work Computer.

4. On next window, click Install button to proceed.

MBAM Default Install

5. Just proceed with the succeeding prompts until it start to execute the installation procedure.

6. Installation process will take less than a minute. It should run automatically after completing the setup.

7. When Malwarebytes Anti-Malware interface appears, please select Scan on the menu. The program will check for any available update before proceeding. Do not skip this step. Virus scan may take a while, please wait for the process to finish.


8. When scanning is done, Malwarebytes Anti-Malware will display the list of identified threats. Remove all and restart the computer to finalized the scan process.

After executing the above instructions, Trojan:MSIL/CryptBot!MSR should have been eliminated totally from the computer. If there are still signs of infection or computer is displaying unusual behaviors, please continue with the remaining procedures.

Stage 1 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 2 :Double Check with Microsoft Security Apps

Microsoft Windows has built-in security application that you can use to double-check if computer is still infected with Trojan:MSIL/CryptBot!MSR. For Windows 8 and 10 users, please run Windows Defender. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove Trojan:MSIL/CryptBot!MSR virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove Trojan:MSIL/CryptBot!MSR, viruses, and other malicious items from Windows 8 or Windows 10 system. Follow these procedures to scan your computer with Windows Defender:

1. Tap or click the Search charm, search for defender, and then open Windows Defender.

If Windows Defender is not yet installed on the computer, please proceed to download page using the link below. It also contains detailed instruction to install and use the program effectively. Proper usage is required to totally remove Trojan:MSIL/CryptBot!MSR


2. On the Home tab, click Full under Scan Options. Click Scan now to start scanning for presence of Trojan:MSIL/CryptBot!MSR. The process may take a while to complete.


3. After the scan, delete/quarantine identified threats wether it is relevant to Trojan:MSIL/CryptBot!MSR or not. You may now restart Windows to complete the virus removal process.

Windows XP, Windows Vista, and Windows 7 Instructions:

1. Open Microsoft Security Essentials by going to Windows Start > All Programs. If the tool is not yet installed on the computer, please download Microsoft Security Essentials from the link below. Save the file on your hard drive.

Complete installation guide and usage are also provided on the same link. It is essential in removing Trojan:MSIL/CryptBot!MSR effectively. If Microsoft Security Essentials is already installed on the PC, please proceed with the steps below.

2. On Microsoft Security Essentials Home screen, please choose Full under Scan Options.

MSE Full Scan

3. Click on Scan Now button to start detecting Trojan:MSIL/CryptBot!MSR items, viruses, and malware on the PC. Scan may take a while, please be patient and wait for the process to end.

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