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Remove NRSMiner (Virus Removal Instructions) - Free Guide

removal by Lucia Danes - - | Type: Backdoors

NRSMiner is a malicious crypto miner that was seen infiltrating machines in Asia with the help of EternalBlue exploit

NRSMiner

NRSMiner is a cryptojacking malware that uses computer's resources like CPU to mine Monero for cybercriminals. First spotted by security in early January 2019, it was seen attacking Asian countries by utilizing EternalBlue (CVE-2017-0144)[1] – the infamous NSA exploit that was used to propagate WannaCry ransomware globally back in 2017. NRSMiner is closely related to XMRig crypto mining utility, which on itself is legitimate software, although heavily abused by bad actors. It spreads through networks and also can be delivered to companies with the help of unlawful installation by third-parties. The malware modifies system heavily, spawns multiple processes and connects to a remote server to receive constant updates. Currently, NRSMiner is considered one of the most successful cryptojacking attacks that are most likely due to the increase in scale in the future.

Name NRSMiner
Type Cryptojacker
Category Malware
Infiltration EternalBlue exploit, as an upgrade to older version of malware
Associated files snmpstorsrv.dll, svchost.exe, TrustedHostex.exe, MarsTraceDiagnostics.xml. wininit.exe
Elimination Use reputable security software
Optimization To make sure all the malicious components are eliminated and system is running properly, scan it with Reimage Reimage Cleaner

Initially, most of the cryptominers are used for legitimate purposes and are not malicious. However, when used by cybercriminals, tools like NRSMiner become an imminent danger to all the infected. Cybersecurity researchers name two main ways how users can get infected with this threat:[2]

  1. By downloading the updater module onto a system that is already infected with a previous version of NRSMiner, or:
  2. If the system is unpatched (MS17-010) and another system within the intranet has been infected by NRSMiner.

If the system is infected with one of the previous variants of the virus, it will contact a specific website to download an update module. Soon after that, it will install the newest version and remove NRSMiner which was located on the system.

Once established, among other actions, NRSMiner will spawn a Snmpstorsrv service that is responsible for multiple different tasks, such as:

  • Extracting C&C and Miner configuration;
  • Sending system information;
  • Sending processor information;
  • Downloading and updater;
  • Creating MgmtFilterShim.ini and running Wininit.exe, etc.

If NRSMiner malware is using EternalBlue to propagate, it will also install DoublePulsar backdoor onto the vulnerable system which then downloads and extracts x86.dll or x64.dll modules, depending on the Windows system version.

Users will generally not understand if they are infected with malware unless they notice the high usage of CPU, which might be attributed to something else. Nevertheless, the best way to detect the threat is to perform a full system scan with the help of security software. 

After NRSMiner removal, users should use Reimage Reimage Cleaner to make sure that all the system changes are reverted and the computer works normally.

NRSMiner virus
NRSMiner is a malicious program designed to mine cryptocurrency on a host machine without permission

EternalBlue has been patched almost two years ago – update your system

According to researchers, the malware mostly affects Vietnam, Iran, and Malaysia – a total of 83.3% of all infections are coming from these three countries, making it especially dangerous for those in Asia. The most likely reason is due to companies and businesses using outdated systems that are not patched.[3]

Since the threat is spread with the help of EternalBlue, the best way to prevent it is to renew the systems and make sure they are up to date. Security patches are released continuously for Windows, so there is no need to delay the installation. Unfortunately, as we saw from previous examples, users all over the world fail to apply updates on time and get infected with various malware.

Therefore, patch your system immediately. Set your Windows to install updates automatically – you will not have to look for a patch somewhere on the internet. Besides, third-parties can host fake updates, bringing in more malware to your machine.

Eliminate NRSMiner to retrieve the security of your computer

NRSMiner virus is a sophisticated infection that is capable of propagating via the intranet. Therefore, even patched systems might get infected rather quickly. For that reason, experts do not recommend manual NRSMiner removal, as the system modifications the malware produces are excessive.

To remove NRSMiner safely, we suggest you download and install security software that can detect the threat. Be aware that not all databases have the virus included, so scans with a few different AV engines might be needed. To ensure that the malware does not interfere with the security program's operation, you might want to enter Safe Mode with Networking, as explained below.

 

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What to do if failed?
If you failed to remove virus damage using Reimage Reimage Cleaner, submit a question to our support team and provide as much details as possible.
Reimage Reimage Cleaner has a free limited scanner. Reimage Reimage Cleaner offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage Cleaner, try running Combo Cleaner.

To remove NRSMiner, follow these steps:

Remove NRSMiner using Safe Mode with Networking

To remove NRSMiner in a safe environment, enter Safe Mode with networking:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove NRSMiner

    Log in to your infected account and start the browser. Download Reimage Reimage Cleaner or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete NRSMiner removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove NRSMiner using System Restore

You can also try System Restore to stop the threat:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of NRSMiner. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage Reimage Cleaner and make sure that NRSMiner removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from NRSMiner and other ransomwares, use a reputable anti-spyware, such as Reimage Reimage Cleaner , SpyHunter 5Combo Cleaner or Malwarebytes

About the author

Lucia Danes
Lucia Danes - Virus researcher

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References


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