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JS Downloader Virus. How to remove? (Uninstall guide)

removal by Julie Splinters - - | Type: Trojans

JS Downloader virus is a trojan horse which uses JavaScript files to get into systems undetected

JS Downloader trojan
JS Downloader virus has been mentioned in numerous alerts posted by Avast, Avg and other security software. Make sure you check its trustworthiness to prevent serious problems caused by a trojan horse.
JS Downloader virus is a trojan horse that uses JavaScript files to gain access to the victim's computer. Once inside the system, this trojan creates autorun.inf, and other malicious files used to ensure normal functioning of the related malware, e.g. ransomware, browser hijackers, etc. The name of this virus comes from the JavaScript code and can be mentioned in AVG, Avast, and other anti-virus software virus reports. If you cannot see an increased usage of CPU that could possibly be caused by JS.Downloader, scan your system with reputable anti-spyware to make sure that it is not a false positive. Otherwise, you should remove JS Downloader trojan horse[1] without any delay. 

Name JS Downloader virus
Type Trojan horse
detected as
  • JS:Downloader-DEF [Trj;
  • Js/Downloader.Agent;
  • JS.Downloader.
Affected OS Windows
Symptoms Disrupting normal functionality of the device, tracking sensitive information, stopping programs, slowing down the OS
Main danger Can significantly damage the system
Distribution Malicious websites, email attachments, dubious software
Elimination To check if it is not a false positive and delete JS Downloader virus, use Reimage.

JS Downloader virus can behave in various ways, and since it came to your PC silently, you might not even notice these changes. You might experience several symptoms, such as:

  • the increased amount of error messages;
  • the general sluggishness of the system;
  • trojans might access the network to download other malicious programs and files, so that it may affect the internet speed;
  • the virus might also change your web browser settings and install extensions and toolbars and add several applications that run in the background;
  • pop-up ads and redirects to questionable websites may disturb your browsing sessions;

To be able to perform this activity, JS Downloader virus modifies the Windows registry. The malware attempts to add new registry keys or alter the existing ones. A computer might crash or freeze because of this.

JS Downloader Virus removal is required because of the malicious nature of the file. Also, because trojan horses are sophisticated and make several changes within the system, a reliable anti-malware software is needed. Researchers[2] advise using reputable security software, such as Reimage or Plumbytes Anti-MalwareNorton Internet Security.

Also, do not forget that JS Downloader virus and similar trojans can serve as a backdoor to ransomware infections. This deadly infection can encrypt all personal files like databases, pictures, videos, audios, etc. and then demand ransom for their release. While the cyberthreat can be disabled pretty easily, the encrypted data remains inaccessible. Thus, make sure you remove JS Downloader before it can inflict even more damage to your computer.

Malicious websites might be designed to inject Trojans

Users might visit questionable websites if they intentionally visit them, such as torrent or porn sites. These domains can be dangerous and are more likely to hide malware. In some cases, users might also be rerouted to dubious places on the internet because of adware infection. Nevertheless, regardless of the reason, never click on any content that you are presented with and merely close down your Google Chrome, Internet Explorer, Mozilla Firefox or another browser.

Additionally, some websites might be hacked by cybercriminals and intercepted with malware. This way, some legitimate sites might include malicious JavaScripts that install the virus automatically. Therefore, avoid websites using an insecure HTTP connection and stick to sites that use HTTPS.

Trojans can also come to your system silently from infected email attachments. Often safe-looking files use malicious macros[3] and inject your PC with backdoor trojans or other types of malware immediately when you download and open them on your device.

JS Downloader virus termination requires reliable tools

To remove JS Downloader virus safely and successfully, you need to employ anti-malware tools like Reimage or Plumbytes Anti-MalwareNorton Internet Security. These programs can detect and delete all possible threats that are related to this trojan. Make sure that anti-malware software is set to scan the machine automatically and have a real-time protection function enabled.

JS Downloader virus removal is not that difficult, but you might have to access Safe Mode with Networking if the cyberthreat is blocking security software from operating correctly. We explain this process below. Additionally, do not try to get rid of the trojan manually, as the procedure is extremely complicated and only trained IT professions are capable of such action.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall JS Downloader Virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
More information about this program can be found in Reimage review.
Press mentions on Reimage
Alternate Software
Plumbytes Anti-Malware
We have tested Plumbytes Anti-Malware's efficiency in removing JS Downloader Virus (2018-07-31)
Malwarebytes
We have tested Malwarebytes's efficiency in removing JS Downloader Virus (2018-07-31)
Hitman Pro
We have tested Hitman Pro's efficiency in removing JS Downloader Virus (2018-07-31)
Malwarebytes
We have tested Malwarebytes's efficiency in removing JS Downloader Virus (2018-07-31)

To remove JS Downloader virus, follow these steps:

Remove JS Downloader using Safe Mode with Networking

In some cases, JS Downloader virus can stop security software from operating properly. So please follow these steps:

  • 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 Downloader

    Log in to your infected account and start the browser. Download Reimage 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 Downloader removal.

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

Remove JS Downloader using System Restore

You can also disable the malware by entering Safe Mode with Networking:

  • 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 Downloader. 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 and make sure that JS Downloader removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from JS Downloader and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes Malwarebytes or Plumbytes Anti-MalwareNorton Internet Security

About the author

Julie Splinters
Julie Splinters - Malware removal specialist

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References