How to eliminate NonEuclid from infected computers

What kind of malware is NonEuclid?

NonEuclid is a Remote Access Trojan (RAT) programmed using C#. This RAT allows unauthorized control of a victim’s computer. It bypasses security systems and is harder to detect. NonEuclid uses various techniques, such as avoiding antivirus detection, escalating privileges, and encrypting important files with ransomware.

More about NonEuclid

NonEuclid includes various features and mechanisms. One of them is the AntiScan feature, which helps the RAT avoid detection by Windows Defender. The malware does this by making changes to the system's settings - it makes Defender to ignore certain files and folders related to the malware. This technique helps the RAT stay hidden and undetected by security software.

Also, NonEuclid includes a feature that monitors running processes and looks for specific ones, like "Taskmgr.exe" or "ProcessHacker.exe". If it finds these processes, it either shuts them down or stops the RAT from being closed. It can also mark its process as "critical", making it harder to terminate.

Furthermore, NonEuclid has a feature that helps the RAT to detect if it is running inside a virtual machine (VM), which is often used for testing or analysis. It checks the system for specific memory objects that are usually found on physical computers. If it detects a VM, it stops running by exiting with a specific code to prevent analysis.

Also, the RAT includes the ASMI Bypass feature, which helps the RAT avoid detection by Windows Defender's AMSI. It does this by finding and altering certain parts of the system's memory related to AMSI, allowing the RAT to run malicious code without being flagged as dangerous.

Moreover, NonEuclid can detect and access multimedia devices, such as cameras, on the infected system. It uses a specific method to find available devices, check their properties, and run custom actions on them.

In addition, the RAT can create a scheduled task that runs automatically at set intervals on the infected system. The malware checks if it has administrative privileges before setting up the task to run in the background, ensuring it stays active even after a reboot.

Lastly, NonEuclid can gain higher system privileges by modifying the registry if it is not already running with admin rights. It also uses AES encryption to lock files like documents and text files. After locking them, it renames the files with the extension ".NonEuclid".

Threat Summary:

Name	NonEuclid Remote Access Trojan
Threat Type	Remote Access Trojan, RAT
Detection Names	Avast (Win32:Malware-gen), Combo Cleaner (Gen:Variant.Bulz.880804), ESET-NOD32 (A Variant Of MSIL/Agent.DBK), Kaspersky (HEUR:HackTool.MSIL.Alien.gen), Microsoft (Trojan:MSIL/AgentTesla.LQL!MTB), Full List (VirusTotal)
Symptoms	RATs 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	Data and financial loss, possible identity theft, additional infections.
Malware Removal (Windows)	To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner. ▼ Download Combo Cleaner To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Conclusion

In conclusion, NonEuclid is advanced malware that allows unauthorized access to systems. It uses a range of techniques to remain undetected, including bypassing antivirus software, blocking process monitoring tools, and avoiding virtual machine analysis.

It is crucial to use strong security measures and be careful when interacting with suspicious content online to avoid threats like NonEuclid. More examples of RATs are SwaetRAT, WmRAT, and BurnsRAT.

How did NonEuclid infiltrate my computer?

NonEuclid malware can be distributed through several methods. It may be spread via deceptive emails that contain malicious attachments or links, tricking users into downloading it. It can also be bundled with (or hidden within) fake or pirated software or downloaded from untrustworthy websites.

Cybercriminals can also use malicious ads or pop-ups to lead users to the malware or deliver the malware through vulnerabilities in outdated software or operating systems. Additionally, they can deploy the RAT using technical support scams, P2P networks, third-party downloaders, compromised websites, and infected USB drives.

How to avoid installation of malware?

Always be cautious when opening emails from unknown senders, and avoid clicking suspicious links or attachments in irrelevant, unexpected, or similar emails. Download software from trusted sources, such as official websites or app stores. Keep your system and software up to date, and use strong security software.

Also, avoid interacting with suspicious ads and pop-ups on dubious websites, and do not agree to receive notifications from web pages of this kind. Never download pirated software or tools to bypass activation. If you believe that your computer is already infected, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

NonEuclid's administration panel (source: cyfirma.com):

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Quick menu:

• What is NonEuclid?
• STEP 1. Manual removal of NonEuclid malware.
• STEP 2. Check if your computer is clean.

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 Combo Cleaner Antivirus 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:

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:

Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

Restart 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.

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.

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.

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

Extract the downloaded archive and run the Autoruns.exe file.

In 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.

Check 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".

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.

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 Combo Cleaner Antivirus for Windows.

Frequently Asked Questions (FAQ)

My computer is infected with NonEuclid malware, should I format my storage device to get rid of it?

Formatting should be considered as a last resort because it removes all data. Before formatting, try running a trusted antivirus or anti-malware tool like Combo Cleaner to scan your computer and eliminate the infection.

What are the biggest issues that malware can cause?

Malware can cause various issues, including stealing personal information, slowing down your system, corrupting or encrypting files, and giving threat actors control of your device. It can also lead to financial loss, privacy breaches, and unauthorized access to accounts.

What is the purpose of NonEuclid?

The purpose of NonEuclid is to gain unauthorized access to a victim's computer and potentially encrypt files for ransom. It uses advanced techniques to evade detection and maintain control over the system.

How did NonEuclid infiltrate my computer?

NonEuclid malware can be delivered through deceptive emails, fake or pirated software, malicious ads, and compromised websites. It can also be delivered via outdated software vulnerabilities, technical support scams, P2P networks, infected USB drives, etc. It likely infected your system after you opened a malicious file or a link.

Will Combo Cleaner protect me from malware?

Combo Cleaner can detect and remove nearly all known malware infections. However, advanced malware often hides deep within the system, so performing a full system scan could be required for complete removal.

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