Proven and Advanced Guide to Remove JS Downloader Trojan Virus

What is JS Downloader Trojan Virus? How To Remove It?

Trojans today are the most dangerous and widely circulated malicious threats within our secured networks. But, cyber attacks are continually piercing these networks (office and home) via different variants of threats without permission.

JS Downloader virus is a trojan horse that comes with hidden malicious programs and uses JavaScript files to gain access to the computer. Once it gets inside your computer, it creates autorun.inf for the smooth functioning of malicious files without the users' knowledge.

Most of the virus variants have been reported in many JavaScript code of anti-viruses reports. This threat intends to disrupt normal functions of the system and it is highly successful in it.

JS Downloader Variants

JS.Downloader, a variant of this virus that first came a few years ago and mostly affected Windows computer. It has been infecting tons of users to this day and the most obvious sign is the slowing down of your browser and system.

It was first noticed in 2003!

Since then plenty of popular variants like JS/Downloader, JS.Downloader.Agent, JS.Downloader!gen33, JS.Downloader!gen36, etc have infected our system’s health.

Once JS.Downloader trojan is inside your computer, it drastically changes computer’s performance. It behaves silently in your PC and serves as a backdoor to ransomware infection.

Also, this deadly infection locks major database files like pictures, videos, media files, audios, etc. To perform this, JS/Downloader modifies Windows registry editors and add new registry keys by altering existing ones.

Trojan-Downloader:JS/Downloader.IOK is a file attached to an email message “MY RESUME.”

On analysing the sample (SHA4: 9b3b8c4cb8d0a67ec7398ac9c0a7b37df8c4d92bd1), we found complicated JavaScript file making impossible for any normal user to read the contents.

On opening the attachment, the JavaScript contacts a remote server that silently starts downloading and executing other malicious files on the affected system. Further analysis proved that the downloaded files lead to the installation of Coinhive malware.

Infections caused by JS Downloader Trojan Family

When we see our computers getting affected by such variants, we start monitoring the functionality of the computer. The adverse results due to malicious programs and variants are described below.

• High CPU power consumption lowers the overall performance of your computer.
• The computer boots up for no reason, sometimes freezes while you are working.
• Slow internet browsing speed might cause the internet to stop unexpectedly.
• Fake alert messages and notification pop-ups to update your operating system.
• Irrelevant web search redirects affect your web browsing experience.
• It steals your browsing information and personal data such as IP addresses, banking details, passwords and login credentials.
• Changes your Windows Registry editors to remain undetected from anti-viruses and anti-malware tools
• Automatic download of executable files from unknown sources and unsecured websites.
• Send fake emails and maintain a false online presence on Social media though you aren’t logged in.

The modifications and unusual activities on the computer let us think upon the solutions of elimination. Solutions in such a way that could bring back our system back to safety.

If you are suffering from the above kinds of symptoms, then our recommendation is to download a removal tool with a click on the below link.

How Did JS Downloader Enters Into Your Computer?

• Malicious websites specifically designed to inject Trojans
• Legitimate websites infected with Trojans
• Email attachments and infected links
• Fake updates for installed software
• Peer-to-peer sharing software
• Malicious video players, audio players and codecs in computer
• Free downloadable games and programs (freeware)
• Chat applications
• IRC Freenode Channels
• Malicious Social media links directing to infected files and websites

Therefore, it is important to remove it and for that, we must block the above entry paths that are responsible for injecting threats.

Also, Read: Remove “Max Video Player” Chrome Extension [Virus] Completely

In August 2018, Alaska a US state suffered from multiple attacks of JS Downloader despite having security measures. The cyber attack was harsh that caused government networks to jam.

Thus, we strongly recommend to remove JS.Downloader Trojan from the computer along with other related malicious files and programs. To help you out with the removal process, we have an automatic and manual guide respectively to remove the trojan.

In the manual guide, our first focus will be on removing and uninstalling malicious extensions, files and programs from your system.

Since the manual guide is a stepwise removal process, it could go longer and take much time. Additionally, doesn’t create an automatic firewall against the trojan.

On the other hand, the automatic method is much more comfortable. For this, we will learn about an anti-malware tool named Malware Crusher, download it and let it work alone to save your computer.

JS Downloader Agent Virus Removal Tool: Automatic Removal Method

An automatic scan of anti-malware tool finds out the presence of all unwanted programs and files. Its robust technology prevents the threat from collecting your information.

Malware Crusher is one such tool that has different threat removal capabilities like;

• It’s real-time protection feature, performs a deep scan, detects malicious software and infected files within your system.
• The Quarantine feature of the tool removes all infected files from your computer in addition to keeping a record of all deleted malicious program.
• Malware Crusher becomes fiercer in detecting keylogging, remote connections and saving your session data from being recorded.
• Malware Crusher also creates a shield against Ransomware, Adware, Malware, Browser Hijackers, Viruses, Extensions and Trojans from entering into your system.
• Malware Crusher tirelessly visits all domains, URLs and web pages to secure your online presence from fraudulent entities.
• The 24X7 online protective shield works as an anti-exploit technology and blocks the ransomware component before they hold files as a hostage.

The automatic method Malware Crusher no doubt is the best option to easily remove (uninstall) cyber threats and other installed malicious codes, programs from your computer.

However, you can also take a look at the manual removal process of virus given below.

Remove JS Downloader Variant files From System Manually

It is difficult to stop the entry of threats associated with JS Downloader without any tool into your computer. Anyhow, you will encounter threats somewhere on the internet, their intention would always be to collect your data.

To avoid this situation, you can use the manual removal process which is described below;

• In your windows computer, press Ctrl + Shift + Esc to open Task Manager.
• Find all and select suspicious, not useable programs. Right click on the selected choice and click End Task.

From the above image, you can gather that other than Google, no other program is running. But, if in your task manager window you find something suspicious, then end it. Also, try uninstalling it through our removal process.

Uninstall Suspicious JS Downloader Variants

Uninstalling suspicious variants is our second step after stopping all processes. For this press Windows Key + R, it opens a Run Window.

• Now type appwiz.cpl to open Programs and Features window.
• Select the suspicious program and uninstall it.

Remember to choose only those programs which in your choice could be harmful to your computer. It is a tricky step because you cannot randomly select any program and uninstall it.

Here, we would say a robust anti-trojan tool is easy to use in comparison to the manual process.

Also, Read: Remove IT.Books Ransomware and Decrypt .fucked Files

Remove Malicious Browser Extensions

If you think that uninstalling the programs from your computer helps you to get rid of threats, then you are wrong! You must remove malicious extensions by yourself.

• Google Chrome
• Firefox

1. Click on the Customize and control menu icon at the top right corner of Google Chrome.

2. Select "More tools" from the menu.

3. Select "Extensions" from the side menu.

4. Click the remove button next to the extension you wish to remove.

5. It will confirm again, click “remove” and the extension is finally out of the system.

Now that we have successfully eliminated the malicious browser extension, we need to create a robust firewall to avoid any such thing that makes our system and privacy vulnerable to various online threats.

1. Click on the “menu” button at the top right corner.

2. Select “Add-ons” from the menu.

3. Click the “Remove” button next to the extension you wish to get rid of.

Now that we have successfully eliminated the malicious browser extension, we need to create a robust firewall to avoid any such thing that makes our system and privacy vulnerable to various online threats.

However, if it becomes difficult for you to judge extensions, we recommend you to reset your browser settings.

Reset Browser Settings

Before you set your browser to default, delete your search history including passwords and login credentials. (Better you note down your personal info on paper before deleting it.)

Reset Google Chrome

• Click three dots on Chrome Window.
• Select Settings, scroll down to the bottom of the page and click Advanced.
• Again scroll down to the end, click Restore settings to their original defaults > Reset Settings.

Reset Mozilla Firefox

• Open Firefox Menu (in the right corner of the Window)
• Select Help > Troubleshooting Information > Refresh Firefox > Finish.
• You can also try Safe Mode to disable the add-on.

Reset Internet Explorer

• Click Gear-icon on the right corner of IE.
• Select Internet Options > Advanced and select options, click Reset.

The manual process is lengthy, needs technical knowledge to remove viruses and trojans from your Windows OS. Though you can execute each step, locating malicious files, extensions and program related to JS/Downloader is a difficult task.

Thus, a permanent solution is needed which can fight 24x7 whether you access your system or not. To get rid of the fake search engine, you must download Malware Crusher, install it and perform a quick full scan.

It automatically removes JS Downloader, fixes your windows computer in less than 5 minutes.

Tips to Prevent virus and malware from Infecting Your System: