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Remove JS.Nemucod (Virus Removal Guide) - updated Dec 2019

removal by Julie Splinters - - | Type: Trojans

JS.Nemucod – a trojan that can install Crowti, Tescrypt, Locky, Fareit, and Ursnif viruses

JS.Nemucod virusJS.Nemucod virus is a dangerous trojan that is distributed via email spam messages and ZIP files  

JS.Nemucod, also known as Nemucod Trojan or TrojanDownloader:JS/Nemucod, is a very dangerous parasite that can relate in the installation of well-known ransomware and other malware. The trojan camouflages as a JavaScript component that is provided in the format of a ZIP file and comes clipped to email spam. According to Microsoft's report,[1] these files have been found to be related to JS.Nemucod virus and its variants:,,, A very interesting but harmful part of this Trojan virus is that it brings ransomware such as Tescrypt, Locky, Crowti, and Fareit, Ursnif parasites to the infected computer.

Questions about JS.Nemucod

The ransomware viruses that are brought by JS.Nemucod aim to encrypt data that is stored on the targeted PC and demand ransoms in exchange for the decryption tool. Continuously, Fareit malware acts as a password recorder and might also access your personally-identifiable information where Ursnif is a Trojan horse that can also steal sensitive data that is saved on your machine and view technical details about your used computer.

Name JS.Nemucod
Alternative names Nemucod Trojan, TrojanDownloader:JS/Nemucod
Category/type Malware/Trojan horse
Related files Once the malware infiltrates the system, it can show up in the format of these files:,,,
Remote hosts The Trojan virus also is capable of connecting to remote hosts such as,, using port 80,
Related malware This virus does not come alone. It can also download Tescrypt, Locky, Crowti ransomware, and Fareit, Ursnif malware
Distribution Trojan viruses are often spread via malicious email attachments that come in the format of a .zip or .exe file. However, they can also be distributed via p2p networks and other unsecured locations
Elimination You should delete the malware by using automatical software only. Do not try to eliminate the parasite manually as this is a very complex process for such threat
Repair tip If you have spotted any damaged objects on your Windows computer system, try repairing them with software such as Reimage Reimage Cleaner Intego

According to Symantec researchers,[2] once JS.Nemucod is installed and starts running on the Windows computer system, it connects to a hacked WordPress[3] page and installs one of these files: %Temp%\67057318.dll,  %Temp%\27172347.exe. Afterward, the malware might launch the downloaded components by using WShell or Rundll32.exe processes.

Since its release in 2015, JS.Nemucod seems to hold multiple versions and complex functionality. Besides all the mentioned processes, the Trojan virus also connects to a remote host in order to succeed in its activities:

  • using port 80;

JS.Nemucod might be set to perform multiple activities. Trojan viruses are capable of stealing personal information about the user. This might result in identity theft and you might find your important data put up for sale on some dark web markets. Continuously, the malware might access the technical data of your computer to remotely connect to it.

Remote connection gives JS.Nemucod the possibility to monitor various activities and alter system settings. The Trojan virus can run secret processes in the background, start damaging your programs and services, disabling your antimalware software, and assuring that it launches newly every time the user turns on the computer system.

This trojan is a very dangerous threat and holds the harm level of very high. Be careful while dealing with this parasite and remove JS.Nemucod as soon as possible. Also, check your system for additional malware that the trojan might have installed and be aware that alterings might have been made to multiple directories of your Windows computer.

JS.NemucodJS.Nemucod is a Trojan virus that can install ransomware such as Tescrypt, Locky, and Crowti. Also, it ads other malware such as Urnsif and Fareit

Signs that indicate the computer is infected with JS.Nemucod virus

JS.Nemucod, just like other Trojan viruses might not show any accurate signs at first and antimalware alerts might be the only way to recognize the malware. However, if you are a more accurate computer user, you might spot some symptoms that indicate the infection. These signs can be the following:

  • The computer runs incredibly slow because of high CPU usage;
  • Programs cannot be opened or crash soon after the user launches them;
  • Minimizing and maximizing windows has become an annoying process due to constant freezes;
  • Intrusive and aggressive pop-ups show up on the screen, even if the user does not browse the Internet; typically, they announce that the computer is severely infected and suggest to install rogue anti-malware program to “fix” all problems;
  • Web browsers act suspicious; the user experiences multiple unexpected redirects to questionable web pages;
  • You discover unnoticed or doubled processes running in the Task Manager section;
  • The Windows Registry is filled with unknown entries.

Unfortunately, it is very hard to detect and remove JS.Nemucod virus manually, because this threat tends to mask itself under unsuspicious and safe-looking names. What is more, this Trojan can disable computer security programs and pass through Windows Firewall and antivirus programs. To remove this threat, we strongly advise you to scan your computer with a powerful malware removal tool that is capable of detecting this virus. 

Continuously, JS.Nemucod might scatter malicious objects all over the system. If you want to get rid of the Trojan virus permanently, you have to eliminate not only the malware itself but all the additional content that has been added by the virus. Also, try detecting all compromised objects as they might require fixing. If you spot any damaged components, you can try repairing them with system repair software such as Reimage Reimage Cleaner Intego.

JS.Nemucod trojan

Trojan delivery techniques

Trojans, unlike viruses, do not spread by themselves. They can only be installed manually. Usually, cybercriminals spread Trojan horses via email or messages on social media websites, peer-to-peer file-sharing programs, or simply place its download link in insecure websites.

However, the most popular and efficient way to spread this virus is to send it directly to the victim via email. Cybercriminals send deceptive messages that usually urge the victim to open the email attachment, often disguised as an official document, for instance, court notice, invoice, resume, or a bill. Also, note that trojans are mostly distributed via files that include the .zip and .exe appendix. 

Email service providers usually automatically filtrate such messages as Junk/Spam, however, some deceptive emails might successfully pass through Spam filters. Before you open any email letter, check if you recognize the sender of it. If you don’t, you should not open such emails or files that come with them.

Continuously, always have reputable antimalware working on your Windows computer and keep the program regularly updated. Experts from[4] state that every user has to make sure that the antivirus software that he/she employs includes as many protective features as possible, e.g. safe browsing, threat detection, malware removal, pushing warnings when something bad occurs, etc.

Removing JS.Nemucod virus

Unfortunately, it is nearly impossible to remove JS.Nemucod manually. It is a complex computer virus, which uses advanced techniques and manages to conceal its components in the computer system ably so that the victim would not find them. So if you have noticed that your computer acts suspiciously, or that some files or programs are missing, and the overall system’s performance has decreased, you should install a reputable anti-malware program.

Use the tool for complete JS.Nemucod removal and get rid of all of the additional content and other parasites that the malware might have brought to the computer system during the infection process. Afterward, scan the entire system for compromised objects by using SpyHunter 5Combo Cleaner or Malwarebytes. When the program detects all of the components, try repairing the damaged products by employing a program such as Reimage Reimage Cleaner Intego

If you find JS.Nemucod virus hard to eliminate because of the malicious processes that it has been initiating or if the parasite has been blocking your antivirus, you can diminish all malicious alterings by completing the following steps:

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What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego 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 Intego, try running Combo Cleaner.

To remove JS.Nemucod, follow these steps:

Remove JS.Nemucod using Safe Mode with Networking

Boot your Windows computer to Safe Mode with Networking and get rid of all malicious changes.

  • 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 JS.Nemucod

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

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

Remove JS.Nemucod using System Restore

Get rid of suspicious alterings and disable the virus by activating System Restore.

  • 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 JS.Nemucod. 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 Intego and make sure that JS.Nemucod removal is performed successfully.

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

Access your website securely from any location

When you work on the domain, site, blog, or different project that requires constant management, content creation, or coding, you may need to connect to the server and content management service more often. It is a hassle when your website is protected from suspicious connections and unauthorized IP addresses.

The best solution for creating a tighter network could be a dedicated/fixed IP address. If you make your IP address static and set to your device, you can connect to the CMS from any location and do not create any additional issues for server or network manager that need to monitor connections and activities. This is how you bypass some of the authentications factors and can remotely use your banking accounts without triggering suspicious with each login. 

VPN software providers like Private Internet Access can help you with such settings and offer the option to control the online reputation and manage projects easily from any part of the world. It is better to clock the access to your website from different IP addresses. So you can keep the project safe and secure when you have the dedicated IP address VPN and protected access to the content management system.

Backup files for the later use, in case of the malware attack

Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.

About the author
Julie Splinters
Julie Splinters - Malware removal specialist

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  1. Tom says:
    March 18th, 2016 at 3:21 pm

    Good! We need to know more about Trojans. Cant seem to find enough information about them…

  2. RobertJ says:
    March 18th, 2016 at 3:25 pm

    Damn Trojan! my brother downloaded this trojan by clicking on a malicious link on some gambling website. Since then,all our family members have secured personal computers with spyhunter. better safe than sorry… my bro lost all his files because nemucod brought teslacrypt into his pc!

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