If Microsoft Security Essentials or Windows Defender detected a threat called Backdoor:PowerShell/Nishang.A!MSR on the computer, it denotes that scanning and removal of this virus is crucial. This virus endangers the online privacy and security of computer users and it could drop additional threats onto the already infected computer. Remote attackers may also access the computer as long as Backdoor:PowerShell/Nishang.A!MSR is inside the system.

Threat Behavior

Backdoor:PowerShell/Nishang.A!MSR infects a computer via another Trojan Dropper. On some infection cases, computer users obtained the virus via cracked programs and spam email messages.

Once executed, Backdoor:PowerShell/Nishang.A!MSR injects various system files and is able to run it by adding a registry entry. This extra code will allow Backdoor:PowerShell/Nishang.A!MSR to run on each Windows start-up and can dominate the computer while running in the background.

The occurrence of Backdoor:PowerShell/Nishang.A!MSR is very harmful because it has backdoor capability which allows the attacker to control the computer from a remote location. Using this protocol, the hackers is able to drop additional virus on the infected system to further strengthen its presence.


The main objective of Backdoor:PowerShell/Nishang.A!MSR infection is to open a backdoor port on the computer that will allow attackers to accomplish the following tasks:

  • Update the current infection
  • Drop supplementary virus codes
  • Extract information like OS version, IP Address, and ISP
  • Take screenshot of the screen
  • Log crucial information such as username, passwords, emails address, etc…

How to remove Backdoor:PowerShell/Nishang.A!MSR?

To totally remove Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!MSR Instantly

To instantly remove Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!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, Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!MSR virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!MSR


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


3. After the scan, delete/quarantine identified threats wether it is relevant to Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!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 Backdoor:PowerShell/Nishang.A!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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