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Danger level 6
Type: Trojans
Common infection symptoms:
  • Slow Computer
  • Connects to the internet without permission
  • Installs itself without permissions
  • Can't be uninstalled via Control Panel


QuasarRAT is a remote access Trojan that – as the description indicates – can access your operating system remotely, which it can do using network connection. This malicious infection originates as a remote-access tool called “Quasar” that was created by a German company, “MaxXor.” Unfortunately, this tool is available publically, and anyone can use it however they want to. Needless to say, cyber criminals would NEVER pass up an opportunity to exploit already existing programs and security backdoors associated with them in a malicious manner. As you might have figured out by now, in this report, we are discussing a tool that can be used by malicious cyber criminals to access your Windows operating system remotely. This infection can be downloaded silently, in which case, malicious activity might be undetected for a really long time, and cyber crooks could create many security-related problems for you in the meantime. Without a doubt, you must remove QuasarRAT, and if you want to learn all about that, you need to continue reading.

According to our research team, QuasarRAT was released back in 2014, and so it is not surprising that since then many different versions of this tool have emerged. The source code of this tool is available publicly, and so anyone can take it and modify it. Some of the functions of the original Quasar program include retrieving system information, downloading and executing files, launching Windows utilities, terminating processes, editing the Registry, turning off or restarting the computer, opening remote desktop connection, performing mouse clicks and keyboard strokes, recording passwords, visiting websites, and displaying messages. Needless to say, these functions give a lot of power to the party accessing the system remotely, and that is exactly why cyber criminals have started exploiting this infection. If they managed to employ QuasarRAT successfully, they might be able to, among other things, disable security tools and malware removers, download and execute malicious programs, steal confidential information, and hijack personal accounts to, potentially, spread further. Needless to say, this kind of malicious software is extremely dangerous, and so it is important to delete it as soon as possible.

The distribution of QuasarRAT is still pretty much a mystery, but that is due to the fact that different parties can employ this malware. Some parties can silently spread the infection via malicious software downloads. Others could set up corrupted websites to load the infection onto visitors’ systems without their notice. Our research team has analyzed a few different versions of this malware, and it was found in such directories as %PROGRAMFILES(x86)%, %WINDIR%\SysWOW64\SubDir\, %APPDATA%\system\, and %APPDATA%\Microsoft\. The names representing the launcher were “MicrosoftUP.exe,” “core.exe,” “Client.exe,” and “servce.exe.” As you can see, the names of the malicious QuasarRAT launcher can be very misleading, and this is done just so you would not notice anything out of the ordinary. In fact, the infection is pretty silent altogether, and you are unlikely to notice it when it slithers in. That is why it is so important to perform routine system scans. Hopefully, the anti-malware tool or the malware scanner you use will uncover the malicious infection right away. If the tool you employ is disabled remotely, you can disconnect your Internet connection to ensure that no one is manipulating your system from afar.

If you uncover the malicious QuasarRAT process, you will be able to find the launcher as well. If you are having issues with the elimination process, you can always install anti-malware software to have the existing infections eradicated automatically. While deleting QuasarRAT manually might be free, only a legitimate and up-to-date anti-malware tool can successfully remove all existing threats and ensure trustworthy protection against those that could try to invade your operating system in the future. If you stick with manual removal, remember that other infections might exist as well. They could have downloaded the remote access Trojan, they could have been downloaded along with it, or they could have been downloaded by it. If you do not take care of these infections, your virtual security could be harmed, and you might continue dealing with serious problems. Also, remember to be cautious online because if security software is not set up to protect you, you might let in new infections soon enough.

QuasarRAT Removal

  1. Launch Task Manager by tapping keys Ctrl+Shift+Esc.
  2. Click the Processes tab and find the malicious {random name}.exe process.
  3. Right-click it and select Open File Location to open the folder containing the malicious launcher.
  4. Go back to the Task Manager, select the process, and click End process.
  5. Go to the folder containing the malicious {random name}.exe file.
  6. Right-click the file and then select Delete.
  7. Launch RUN by tapping Win+R keys on the keyboard.
  8. Type regedit.exe into the dialog field and click OK to access the Registry Editor.
  9. Navigate to HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\RUN.
  10. Right-click and Delete the malicious {random name} value linked to the ransomware.
  11. Empty Recycle Bin and do not forget to perform a full system scan next.
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