Remove Quasar remote access tool

Also Known As: Quasar remote access trojan
Type: Trojan
Distribution: Low
Damage level: Severe

Quasar virus removal guide

What is Quasar?

Quasar is a tool which, if connected to another computer, allows to control it remotely. Software of this type is known as remote access tool (RAT). There are legitimate and illegal RATs. Quasar is a legitimate tool, unfortunately, cyber criminals often use such tools for malicious purposes. To be more precise, to steal personal information that could be used to generate revenue. If there is a reason to believe that Quasar is installed on the operating system (and it was not installed intentionally), then it should be uninstalled as soon as possible.

Quasar malware

Quasar can be used to access Task Manager, Registry Editor, manage files and startup items, download/upload and execute files, access system information, run various computer commands, log keystrokes, steal passwords and access files stored on a computer. It is quite a powerful tool that can be used to cause serious problems. By using Quasar cyber criminals could be able to access Task Manager and end or start various processes, to add various programs that would run automatically at system startup. Note, added programs are likely to be malicious. Furthermore, Quasar can be used to download and execute various files. It means that cyber criminals could use it to infect computers with high-risk malware such as ransomware, trojan or other malicious software. It is known that Quasar can operate as a keylogger, it means that it is capable of recording keys struck on a keyboard. This feature can be used to steal credentials (logins passwords) of personal, important accounts like Facebook, email, banking accounts and so on. By having access to account of this type cyber criminals could make money transactions, purchases, to obtain some sensitive information and so on. Either way, recorded keystrokes can be used to cause serious problems like financial loss, loss of private information or access to important accounts. Moreover, Quasar can be used to shut down or restart a computer too. This might lead to data loss or other problems. For example, unsaved data in documents or other files might be lost and so on. This RAT can also be used to steal and recover passwords from common browsers like Google Chrome and Mozilla Firefox or various FTP clients. This feature could be used to steal various important accounts too. By being able to access Registry Editor cyber criminals who use Quasar could change system and application settings. Note, registry errors can cause a variety of problems, including irreversible damage to the operating system. To sum up, Quasar can do a lot of things, if used for malicious purposes it could cause many and serious issues. For these reasons it is strongly recommended to uninstall it immediately. However, it applies only to users who were tricked into installing it by some cyber criminals.

Threat Summary:
Name Quasar remote access trojan
Threat Type Remote access trojan, Password stealing virus, Banking malware, Spyware
Detection Names Avira (HEUR/AGEN.1031030), BitDefender (Gen:Variant.Graftor.441959), ESET-NOD32 (A Variant Of Win32/Kryptik.GCKI), Kaspersky (HEUR:Trojan.Win32.NetWire.gen), Full List (VirusTotal)
Symptoms Trojans are designed to stealthily infiltrate victim's computer and remain silent thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software cracks, unreliable file or software download channels, fake updating tools.
Damage Stolen banking information, passwords, identity theft, victim's computer added to a botnet, installation of various malware.

To eliminate Quasar remote access trojan our malware researchers recommend scanning your computer with Spyhunter.
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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

More examples of RATs are Sakula, DarkComet and FlawedAmmyy. The problem is that tools of this type are often used to perform illegal actions (i.e. steal sensitive information, accounts). Very often people who have their computers infected with RATs end up experiencing financial, data loss, having their computers infected with other malware and so on. That is why it is important to remove tools of this type the second they were detected/discovered on the operating system.

How did Quasar infiltrate my computer?

Research shows that cyber criminals spread Quasar through spam campaigns and various downloaders (or other unreliable download channels). Cyber criminals who use spam campaigns send emails that contain attached files and hope that recipients will open them. If opened, malicious attachments install unwanted, malicious software. Examples of files that are often used to spread malware are: Microsoft Office documents, PDF files, executables, JavaScript files, archives like ZIP, RAR that contain malicious files and so on. Furthermore, unreliable file or software download channels can be used to spread malware too. Typically, these are various third party downloaders (or installers), unofficial websites, free file hosting websites or freeware download pages, Peer-to-Peer networks (torrent clients, eMule and so on) and other similar sources. People who open files downloaded from there often cause installation of some malicious software. It happens because uploaded files are disguised as harmless, normal or legitimate. Other ways to trick people into installing programs of this type is to use fake updating tools, trojans and unofficial software 'activation' tools. People who use fake updating tools that supposed to update software often cause downloads and installations of other, malicious programs. These tools can infect computers by exploiting bugs, flaws of outdated software too. Trojans are malicious programs that cannot damage systems if they are not installed. However, once installed, they download and install/spread malware. Unofficial "activators" are used by people who want to avoid paying money for licensed software. However, these tools often are designed to spread malicious software too.

How to avoid installation of malware?

If a received email is irrelevant, it is sent from unknown, suspicious address and contains some attachment, then it should be handled carefully. Files that are attached to emails of this kind should not be opened. All software should be downloaded from official sources (websites), none of the other channels or tools should be trusted. Update installed software properly: update it with implemented functions (or tools) that are created by official software developers. If installed software requires activation, it should not be bypassed using various third party activation ('cracking') tools. They are illegal and are often used to spread (install) malicious software. Operating system can also be protected by regularly scanning it with a reputable anti-virus or anti-spyware suite. If you believe that your computer is already infected, we recommend running a scan with Spyhunter for Windows to automatically eliminate infiltrated malware.

Screenshot of Quasar administration panel:

quasar administration panel

Instant automatic removal of Quasar remote access trojan: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of Quasar remote access trojan. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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How to remove malware manually?

Manual malware removal is a complicated task, usually it's better to let antivirus or anti-malware programs do it automatically. To remove this malware we recommend using  Spyhunter 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's an example of a suspicious program running on 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 1 Download 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 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 Autoruns application and locate the malware file that you want to eliminate.

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

locate the malware file you want to remove

After removing the malware through Autoruns application (this ensures that the malware won't 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 file 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 help remove any malware from your computer. Note that manual threat removal requires advanced computer skills, it's recommended to leave malware removal to antivirus and anti-malware programs. These steps might not work with advanced malware infections. As always it's better to avoid getting infected that try to remove malware afterwards. To keep your computer safe be sure to install latest operating system updates and use antivirus software.

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

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.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity

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

QR Code
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Platform: Windows

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