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How to remove the Nyan Worm malware from your operating system?

Also Known As: Nyan Worm remote access trojan
Type: Trojan
Damage level: Severe

What is the Nyan Worm malware?

Nyan Worm is the name of a malicious program. It is classified as a Remote Access Trojan (RAT). Malware of this type is designed to enable stealthy access and control over an infected machine. These trojans can have a certain level of control over the device's hardware, software, and stored content and information.

RATs can have a wide variety of malicious abilities; hence, the threats posed by them are likewise varied. Nyan Worm is also considered to be a backdoor malware. This term refers to a piece of software capable of opening a "backdoor" for additional malicious programs.

In other words, Nyan Worm can download/install trojans, ransomware, cryptocurrency miners, and different malware.

Nyan Worm malware detections on VirusTotal

As mentioned in the introduction, remote access trojans can have a broad range of heinous functionalities. Standard RAT features include: content exfiltration and infiltration, installed application management, data stealing, and spying abilities. These trojans typically interact with and/or manage the Windows Registry.

This database contains settings, options, values and other information - relating to the device's hardware and installed software. Therefore, RATs can manipulate/manage both hardware and software.

The former can be: remote keyboard and mouse control, opening/closing the CD-ROM, using the speakers to play audio, recording/streaming audio and video via integrated/connected microphones and webcams, etc.

The latter can entail the malware viewing, opening, running, deleting, and gathering information about installed applications. Some RATs can also end running processes. The malicious programs can have a similar level of control over stored files (e.g., rename, copy, move, download, delete, etc.).

Trojans that are able to infiltrate and execute files - can be used to cause chain infections. This is an ability that the Nyan Worm RAT has. Hence, it can be used to infect the system with trojans, ransomware, cryptominers, and other malware.

Furthermore, many remote access trojans have information-stealing functionalities. Aside from downloading stored system/personal files and recording audio/video, these programs may be able to take screenshots, extract data from installed applications, and log keystrokes (keylogging).

Information of interest includes (but is not limited to): various account/platform/service log-in credentials (i.e., IDs, usernames, and passwords), browsing activity, personally identifiable details (e.g., names, addresses, emails, etc.), finance-related data (e.g., banking account details, credit card numbers, etc.), and so on.

To summarize, RAT infection can result in multiple system infections, data loss, device damage, severe privacy issues, significant financial losses, and identity theft.

If it is suspected/known that Nyan Worm (or other malware) has already infected the device - an anti-virus must be used to eliminate it without delay.

Threat Summary:
Name Nyan Worm remote access trojan
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Detection Names Avast (Win32:Trojan-gen), BitDefender (Gen:Variant.Ransom.Phobos.41), ESET-NOD32 (A Variant Of MSIL/Agent.CBW), Kaspersky (HEUR:Trojan.MSIL.APosT.gen), Microsoft (Trojan:Win32/Ymacco.AAB4), Full List Of Detections (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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JacksBotStrigoi MasterElephantOrcus, and ViperSoftX are some examples of RATs. Malware can have a variety of malicious functions, which can cause a broad range of serious problems.

Malicious programs can: download/install additional malware, encrypt data and/or lock the device's screen for ransom purposes (ransomware), steal information, use system resources to generate cryptocurrency (cryptominers), enable remote access and control over the machine, etc.

System infections pose a threat to both the compromised device and user safety. Therefore, it is strongly recommended to remove all threats immediately upon detection.

How did Nyan Worm infiltrate my computer?

Malware is distributed using various tactics and techniques. Malicious programs are often disguised as or bundled with ordinary software/media, and typically spread via untrustworthy download sources (e.g., unofficial and free file-hosting websites, Peer-to-Peer sharing networks, and other third-party downloaders).

Illegal activation ("cracking") tools and fake updates are prime examples of malware-proliferating content, usually obtained from dubious download channels. "Cracks" can infect systems instead of activating licensed products.

Illegitimate updaters cause infections by exploiting flaws of outdated programs and/or by installing malicious software rather than the promised updates.

Spam campaigns are also commonly used to proliferate malware. This term defines a large-scale operation during which thousands of deceptive/scam emails are sent. These letters have infectious files attached to and/or linked inside them.

Virulent files can be in various formats, e.g., Microsoft Office and PDF documents, archives (RAR, ZIP, etc.), executables (.exe, .run, etc.), JavaScript, and so forth. When the files are executed, run, or otherwise opened - malware download/installation is triggered.

How to avoid installation of malware?

It is important to always use official and verified download channels. Furthermore, all programs have to be activated and updated with tools/functions provided by legitimate developers.

To avoid infecting the system via spam mail, it is advised against opening suspect and irrelevant emails - especially any attachments or links found in them. It is paramount to have a reputable anti-virus/anti-spyware suite installed - to ensure device and user safety.

This software must be kept up-to-date, used to perform regular system scans, and remove detected/potential threats and issues. 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.

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer 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:
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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 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:

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 autoruns.zip 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 Combo Cleaner Antivirus 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 pcrisk.com 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 malware activity level today:

Medium threat activity

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

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