How to eliminate the Quaverse RAT?

Also Known As: Qua RAT
Type: Trojan
Distribution: Low
Damage level: Severe

Quaverse virus removal guide

What is Quaverse?

Quaverse (also known as QRAT and Qua RAT) is the name of a Remote Access Trojan (RAT) that is based on Java programming language. Like most RATs, it allows cyber criminals behind it to remotely control infected computers. In most cases RATs are used with a purpose to steal sensitive information and/or distribute other malicious programs. Research shows that Quaverse is offered under the software-as-a-service (SaaS) model - it can be accessed online via a subscription.

Quaverse malware

Quaverse can be used to steal passwords that are saved on a browser and email clients, log keystrokes, execute commands via Command Prompt, access files that are stored on victim's computer, download and execute files, and view victim's screen. Cyber criminals can use obtained passwords to steal various accounts and use them for various malicious purposes (e.g., distribute Quaverse further, trick other users into sending them money, make fraudulent purchases, transactions). Quaverse's keyloging feature can be used to steal passwords too, also, it can be used to steal information such as credit card details. Malware that can function as a keylogger allows cyber criminals to record keyboard input (data that victim enter with their keyboard). Furthermore, cyber criminals can use Quaverse to perform various actions (execute various commands) via Command Prompt, for example, delete, modify files, restart, shut down a computer, schedule various tasks, get information about the system, and many other things. Also, cyber criminals can use this RAT to download and execute files, which means they can infect a computer with additional malware (e.g., some Trojan, ransomware, cryptocurrency miner), or install some other unwanted software. Or they can use Quaverse to access files that are already stored on the infected computer, any personal documents, or other sensitive files.

Threat Summary:
Name Qua RAT
Threat Type Remote Administration Trojan, Spyware
Detection Names AegisLab (Trojan.Java.Agent.b!c), DrWeb (Java.Siggen.466), Kaspersky (HEUR:Trojan-Dropper.Java.Agent.gen), Microsoft (Trojan:Script/Wacatac.C!ml), Full List (VirusTotal)
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

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To sum up, having Quaverse installed on the operating system could be the culprit of problems like data, monetary loss, identity theft, loss of personal accounts, problems related to online privacy, browsing safety, and other serious issues. As mentioned in the introduction, most of the times cyber criminals use RATs like Quaverse to steal confidential, sensitive information and/or infect computers with other malware. In one way or another, they are used to generate revenue in malicious ways. More examples of RATs are GravityRAT, Abaddon and DuckRAT.

How did Quaverse infiltrate my computer?

It is known that cyber criminals distribute the Quaverse RAT via malspam - they send emails that have a malicious archive file (ZIP file) attached to them. That ZIP file contains a malicious .jar file which, if executed, starts the installation process of the Quaverse. Although, archive files are not the only files that cyber criminals use in their malspam campaigns. They can use Microsoft Office documents, PDF documents, executable files (like .exe), JavaScript files or other archives (like RAR) for that as well. Either way, in most cases those files start the malware installation process as soon as they get opened. It is worthwhile to mention that cyber criminals disguise their emails as important, official, and they exploit the names of well known companies to make their emails look like they are legitimate. It is known that at least one malspam campaign that is used to distribute Quaverse is disguised as a letter from FedEx.

How to avoid installation of malware?

Software should be downloaded from official, legitimate pages and through direct download links. Other sources, tools (examples are mentioned in the previous paragraph) should not be used - it is common that they are used as tools to distribute malicious files, programs. Operating system and installed programs have to be updated with implemented functions and/or tools that are provided (designed) by their official developers. None of the, third party updating or unofficial activation ('cracking') tools can be trusted. Besides, it is not legal to use them to activate licensed software, neither it is legal to use installers for pirated ('cracked') software. Attachments and/or links in emails should be opened only when there is no reason to believe that it might be unsafe. Links and files in irrelevant emails that are sent from unknown, suspicious addresses should not be trusted - it is common that such emails are used as tools by cyber criminals who seek to trick recipients into infecting their computers with malware. One more important thing is to scan the operating system/computer for threats regularly and to that with a reputable and up-to-date antivirus or anti-spyware software. If you believe that your computer is already infected, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.

Screenshot of the malspam campaign that is used to trick users into installing Quaverse:

Malspam used to distribute Quaverse RAT

Text in this email:

Subject: FedEx Parcel Delivery




Your parcel sent by our customer arrived at out FedEx office successfully.


TRACKING NUM: 7774994746621


Please see attached file for more details about the package and how to pickup your package.

Account Help Fees Privacy/Cookies Apps Shop

Please do not reply to this email. We are unable to respond to inquiries sent to this address. For immediate answers to your questions, visit our Help Center by clicking "Help" located on any FedEx page or email.


Copyright © 2020 FedEx, Inc. All rights reserved. FedEx is located at 2211 N. First st., San Jose, CA 95131.

Update 8 January 2021 - There is a new malspam campaign that is used to trick recipients into infecting their computers with QRAT (Quaverse) via its downloader that is attached to an email. The malicious attachment is a JAR (Java Archive) file named “TRUMP_SEX_SCANDAL_VIDEO.jar” (its name may vary). It is worthwhile to mention that this attachments does not coincide with the theme of the email which is related to some investment offer.

Screenshot of the new malspam email:

qrat malware malspam email

Text in this email:



We are interested in partnering and investing in your that dream project or business plan, also we can grant you a loan with a good return of investment on a long and short period of time. We can invest or loan from the rage of 500,000US to over 100Million USD.


If you are interested in order offer kindly contact immediately to book for an appointmentwith one of our agent.


Thank you.


Jonathan Clement

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How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Malwarebytes for Windows. If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":


manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Malwarebytes for Windows.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Qua RAT QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Qua RAT on your mobile device.
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