My computer is really slow. I got JS:Downloader-ZY [Trj] virus warning pop up on my screen every time I turn on my computer. Although my anti-virus software detects this Trojan attack, it just fails to delete it from the infected system entirely. I have no clue how to get rid of this nasty computer virus effectively, please help!

Brief Introduction to This Trojan

JS:Downloader-ZY [Trj] is classified as a nasty Trojan horse virus which mainly infects computers with Windows XP, Windows Vista, Windows 7 and 8 systems. Windows computers mainly get hit by downloading free malware or viewing malicious link. Most often, it gets into the target computer by spam mail attachments which sent by cyber hackers or bundle of free software installation. Hackers can forge the title of the E-mails just entice innocent people to open it, also, they will implant this Trojan to other freeware that can be used by computer users. When you open an unknown and dubious link to download some free software, it will bundle itself into the installation and automatically install without your awareness. You should be careful about all the functions of the applications in a bundle that you want to install because that is one of the most popular ways for viruses intruding the target computer.

To make the situation worse, this virus never comes alone. JS:Downloader-ZY [Trj] usually helps other malware intrude into the infected computer so that they can modify the infected system settings and degrade security levels. Generally, it opens a loophole to bring in other malware then activates them secretly, with such infection, the infected computer can be damaged severely. In order to get activated as soon as the system is launched, the windows registry can be changed by this Trojan, it will mess up the registry by replacing some system keys with its own settings. The firewall and anti-virus program on the infected computer can also be disabled, which will make the infected computer get hit by more computer viruses and Trojans.

Under this circumstance the infected computer resources is highly taken up and the system can get stuck time to time, what’s worse, computer will get black screen and even blue screen of death frequently during the use. If this virus cannot be removed in time or even cannot be recognized on a computer, the infected compute will finally come to a complete crash. If the infected machine is connected to the Internet, it can upgrade itself to the latest version and make more damage to the infected computer. Cyber hackers can use this Trojan to infiltrate the infected machines without users’ approval and once the illegal connection is established, they can steal everything that they can use secretly. At that time, PC user will suffer from money loss which is hardly to get the money back.

Some Traits about This Trojan

-Can slow down the performance of the computer, or even blue screen.
-Can create many junk files which occupy a lot of space in hard drive
-Can download other malicious programs into computer, which make further damage.
-Your sensitive information can be stolen by hacker who can access to your computer with the help of this Trojan.
-Cay give you many redirects all the time no matter what you are doing.
-May pretend as an anti-virus program and cheat you that computer is in dangerous, and ask you to pay to remove the threats.

NOTE: If you find any of these symptoms on your computer, that proves your PC is under attack and seriously infected. If you are not a computer savvy,Please contact YooSecurity Online PC Experts to remove this JS:Downloader-ZY [Trj] for you.

Manual Removal Guide of Trojan (For Computer Literate)

There is a removal guide of Trojan provided here; however, expertise is required during the process of removal, please make sure you are capable to do it by yourself.

Step 1: Find Ctrl, Alt, and Delete these 3 keys and then press them together to open task manager to end the process related to this Trojan, the name of the process of it is random.

XP task manager

Step 2: Try to find Folder Options in Control Panel, select the View tab, and then tick Show hidden files and folders and non-tick Hide protected operating system files (Recommended) and then click OK.


Step 3: Try to find the files which relate to this JS:Downloader-ZY [Trj], and delete them all.

Step 4: Click on Start button at the right lower corner, then click on Control Panel


Then you will come to the Control Panel windows, click on Add and Remove Programs


Then try to find the program which relates to this Trojan, highlight it and choose Remove, the program’s name is random.


Step 5: Click on Start button or press Win+R, then type regedit in the box to open Registry Editor, after that, try to find
C:\Users\profile name here\AppData\

Similar video guide to modify Windows registry:


JS:Downloader-ZY [Trj] is a malicious Trojan infected that can target Windows machines. Once it is installed on a computer, it can disconnect network connection, corrupt system files without user consent. With the help of this Trojan, many other computer threats like viruses and malware can come from the backdoor. What makes the situation worse is that it can help cyber hackers establish secret access to the infected computers. Those crooks mainly aim on financial information which they can use to get illegal benefits.

Suggestion: To follow removal guide that mentioned above, a level of computer knowledge is needed. Still can’t get out of JS:Downloader-ZY [Trj]? Contact online experts for help now!

Published by Tony Shepherd & last updated on May 3, 2014 10:38 pm

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