How to remove JS.Nemucod

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

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: Invoice_ref-.zip, foto.zip, Gilberto_Bond.zip,  8221261_notice_to_appear_000986189.zip. 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.

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.

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:

• ohelloweuqq.com;
• hpalsowantsff.com;
• sahasafe.com using port 80;
• thisisitsqq.com.

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.

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 FortectIntego.

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 Virusai.lt^[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 SpyHunterCombo Cleaner or MalwarebytesMalwarebytes. When the program detects all of the components, try repairing the damaged products by employing a program such as FortectIntego. 

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: