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Remove Trojan:Win32/Ymacco (Virus Removal Guide) - updated Jan 2021

removal by Julie Splinters - - | Type: Trojans

Ymacco Trojan is a piece of malware that can open backdoors and expose users to malicious websites

Ymacco Trojan virus

Trojan:Win32/Ymacco is a is a highly dangerous cyber infection that aims at injecting malicious scripts on the infected machines, downloading other dangerous programs, manipulating system's performance, rerouting users' traffic to compromised websites, and more. In short, it can initiate various risk-posing performances on the host machine, so an ASAP removal is recommended. 

This trojan[1] has been designed in a sophisticated manner, which is why it is capable of infecting machines stealthily via spam emails, pirated software, cracks, and similar content. Upon installation, it starts running malicious processes, one of the most prominent of which is Uwgcset.exe. Usually, this process is highly obfuscated to prevent detection. Nevertheless, a full scan with a professional AV tool usually ends up warning users about the Trojan:Win32/Ymacco.AAC9, Win32/TrojanDownloader.Delf.CYB, Trojan.GenericKD.43360621, and similar detection. 

Questions about Trojan:Win32/Ymacco

Unfortunately, the Ymacco virus is extremely deceptive as it does not give its presence straightforwardly. It can hide in the system for quite a while unnoticed until the user spot high CPU usage by suspicious files, unfamiliar files within random folders, web-browser redirects to sites like,,,, and others. Malware like this can cause serious issues, such as spyware or ransomware infiltration, so make sure to remove the Trojan without a delay. 

Name Ymacco Trojan
Type Trojan
Danger This trojan poses a risk to the users of infected machine by initiating regular redirects to infected web domains, running malicious processes in the background, and downloading other malware to the system
  • Trojan:Win32/Ymacco.AAC9 (Windows Defender)
  • Win32:PWSX-gen [Trj] (AVG)
  • Win32/TrojanDownloader.Delf.CYB (ESET-NOD32)
  • HEUR:Trojan-Spy.Win32.Noon.gen (Kaspersky)
  • Trojan.Win32.WACATAC.THFAHBO (TrendMicro)
  • Trojan.GenericKD.43360621 (BitDefender)
  • Trojan.GenericKD.43360621 (B) (Emsisoft)
  • PossibleThreat.ARN.M (Fortinet)
  • Trojan.Downloader (Malwarebytes)
  • Trojan:Win32/Ymacco.AAE6
  • ML.Attribute.HighConfidence (Symantec),
  • etc.[2]
Symptoms The Trojan runs malicious processes in the background and triggers high CPU consumption. Besides, it may hijack web browsers and redirect the traffic to sites infected by malicious scripts
 Removal Malicious files get hidden in various system locations and often disguised under legitimate Windows files/processes. Therefore, a full system scan with a professional AV tool is required for the proper Ymacco trojan removal
Fixing the damage A scan with ReimageIntego tool is recommended since such tools like PC repair or system applications can repair the affected system's settings, files, and processes. Full optimization is required to prevent issues in the future

This trojan is often dubbed as Trojan:Win32/Ymacco.AAC9 on the basis of the AV detection brought by Windows Defender. Nevertheless, it's internationally known as the backdoor or trojan virus due to the traits that it has. 

  1. The malicious trojan loader Uwgcset.exe infiltrates machines without being noticed as a component of a malicious spam email attachment or pirated software like cracks or keygens;
  2. Upon infiltration, it extracts the trojan package and starts running various malicious entries on the Startup and Task Manager;
  3. It misuses CPU, which is why the system's performance decreases significantly;
  4. It aims at weakening the system's performance to open the backdoor and enable access to other malicious software. 
  5. It creates persistence to avoid detection and removal. Often the processes of AV programs are disabled. 
  6. The Ymacco Trojan virus can inject malicious scripts within web browsers to open malicious websites;

Experts from[3] claim that a regular system scan with a reputable AV engine is a must to ensure that the system is virus-free. Keep in mind that Trojans like the Ymacco virus are difficult to detect because they do not manifest themselves easily, so no scanning the machine on regular basis can mean a long persistence to the virus.

At the moment, a successful Ymacco trojan removal can be initiated with 52 most reputable AV tools as they have crucial updates required for the detection of this pest. Note that the detection may differ regarding the application that you are using, so if you want to be clear if this particular trojan is hiding on your machine, you can check the VirusTotal provided detection names for it. 

Ymacco malwareThe trojan is often detected as Trojan:Win32/Ymacco.AAC9 and the detection should not be ignored as it signals a dangerous virus to be running on the machine

The good news is that the virus is not a spyware or banking trojan. It means that it does not seek to steal your passwords or other credentials. It's primary task – weaken PC's security and increase vulnerability. After that, it exposes the user of an infected machine to the malicious domains, thus posing a high-risk of malware downloads. 

The bad news is that Ymacco trojan redirects can expose you to sites like,, and others that are infamous for click-to-download malware distribution, infected software updates, click-bait ads, and other social engineering strategies. 

Therefore, make sure to remove Ymacco Trojan as soon as possible. For this purpose, take advantage of a powerful anti-virus program and run its scan after restarting Windows into Safe Mode with Networking. 

As we've already pointed out, a scan with an AV engine will not repair damaged system files. Thus, tight after the Ymacco virus removal, download ReimageIntego or similar repair tool and set it to fix all detected system issues. 

Malicious code disguised under file attachments can deliver trojans

The source of trojans cannot be specified because there are many. Criminals are using various techniques to make people slip on downloading malicious entries to their machines, so the only precautionary measure is to be careful when browsing online and keeping the machine fully protected by AV programs. 

Nevertheless, there are several methods that are known to be the primary trojan download sources. First of all, malicious codes are frequently hidden in spam email attachments. People may get fake email messages that supposedly contain financial information, receipts, invoices, order confirmations, and so on. Such emails may be professionally crafted, though usually, they contain grammar, typo, and logic mistakes. 

Ymacco detection namesYmacco trojan is recognized by most of the reputable AV engines, except different detection names are used

Apart from spam, people may be tricked into downloading trojans by downloading illegal content from P2P networks, torrenting sites, or other pirating sources. Hackers can easily inject malicious scripts into various cracks, keygens, third-party games, etc.  

Trojans are also often distributed via infected links that people receive on social media. For instance, the well-known Facebook virus has been, and probably still is, the most successful malware distribution campaign. Therefore, do not trust suspicious content even if it comes from a trusted source. 

Remove Trojan:Win32/Ymacco to protect the system from malware

There is a sole technique that is fully functional in dealing with viruses like Ymacco trojan. That's a thorough system scan with a robust anti-malware tool. Since this virus is highly dangerous in its nature as it poses a risk to the user's privacy and the system's security, it has to be fully eliminated. 

Employing a professional anti-malware for Ymacco trojan removal gives the advantage of cleaning other cyber infections at the same time. If you are not sure when the machine has been infected, there's a risk that it has been running for a long time already and might have downloaded a bunch of malicious files. 

Rely SpyHunter 5Combo Cleaner or Malwarebytes tools for checking the system and performing a full Ymacco trojan removal. If you cannot launch the security tool, try to restart Windows into Safe Mode with Networking (a guide provided below). Finally, do not underestimate the need for the system's optimization. Download ReimageIntego and scan the machine to restore all files that the trojan might have damaged or removed.

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What to do if failed?
If you failed to remove virus damage using Reimage Intego, submit a question to our support team and provide as much details as possible.
Reimage Intego has a free limited scanner. Reimage Intego offers more through scan when you purchase its full version. When free scanner detects issues, you can fix them using free manual repairs or you can decide to purchase the full version in order to fix them automatically.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Reimage, try running SpyHunter 5.
Alternative Software
Different software has a different purpose. If you didn’t succeed in fixing corrupted files with Intego, try running Combo Cleaner.

To remove Trojan:Win32/Ymacco, follow these steps:

Remove Trojan:Win32/Ymacco using Safe Mode with Networking

The Trojan:Win32/Ymacco.AAC9 detection is a signal that the system is infected with a Trojan and has to be cleaned to prevent various issues. For this purpose, restart the machine into Safe Mode and run a full system scan as explained below:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Trojan:Win32/Ymacco

    Log in to your infected account and start the browser. Download ReimageIntego or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Trojan:Win32/Ymacco removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Trojan:Win32/Ymacco using System Restore

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Trojan:Win32/Ymacco. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with ReimageIntego and make sure that Trojan:Win32/Ymacco removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Trojan:Win32/Ymacco and other ransomwares, use a reputable anti-spyware, such as ReimageIntego, SpyHunter 5Combo Cleaner or Malwarebytes

Do not let government spy on you

The government has many issues in regards to tracking users' data and spying on citizens, so you should take this into consideration and learn more about shady information gathering practices. Avoid any unwanted government tracking or spying by going totally anonymous on the internet. 

You can choose a different location when you go online and access any material you want without particular content restrictions. You can easily enjoy internet connection without any risks of being hacked by using Private Internet Access VPN.

Control the information that can be accessed by government any other unwanted party and surf online without being spied on. Even if you are not involved in illegal activities or trust your selection of services, platforms, be suspicious for your own security and take precautionary measures by using the VPN service.

Backup files for the later use, in case of the malware attack

Computer users can suffer from data losses due to cyber infections or their own faulty doings. Ransomware can encrypt and hold files hostage, while unforeseen power cuts might cause a loss of important documents. If you have proper up-to-date backups, you can easily recover after such an incident and get back to work. It is also equally important to update backups on a regular basis so that the newest information remains intact – you can set this process to be performed automatically.

When you have the previous version of every important document or project you can avoid frustration and breakdowns. It comes in handy when malware strikes out of nowhere. Use Data Recovery Pro for the data restoration process.

About the author
Julie Splinters
Julie Splinters - Malware removal specialist

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