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Remove O97m/Mamacse.f Trojan in Depth   The O97m/Mamacse.f Trojan is the name of a very malicious computer threat which belongs to the Trojan Horse...
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Remove O97m/Mamacse.f Trojan in Depth

O97m/mamacse.f Trojan

The O97m/mamacse.f Trojan is a very serious threat. It can hide even in the legit Windows Files.


The O97m/Mamacse.f Trojan is the name of a very malicious computer threat which belongs to the Trojan Horse family. The presence of this infection inside your computer can lead to various issues, some of which may be fatal to your system. As you have probably heard, the representatives of the Trojan Horse category are some of the most stealthy and the most malicious pieces of software. They can be very versatile and can be used for a bunch of criminal actions, such as theft of personal details, of login credentials and of banking data, webcam and mic hacking, espionage, insertion of viruses like Ransomware or Rootkits, blackmailing and more. The criminals who create them rely on the malware’s ability to remain unnoticed and to operate in silence so that it doesn’t get noticed before it has fulfilled its agenda. In most of the cases, there aren’t many visible symptoms which can give the Trojan Horse away and draw your attention to its presence in your machine. This makes its timely detection even more difficult, especially if the victims don’t have reliable and updated security software, which can catch and remove it before something bad has happened. If you are reading this post, however, you probably have a suspicion that O97m/Mamacse.f might be hiding somewhere inside your system and you are likely currently on the lookout for help with the removal of this infection. That’s why, in the next lines, we will provide you with a detailed Removal Guide on how to remove the O97m/Mamacse.f Trojan in the fastest and the safest way – just make sure that you keep reading and that you remember the information we are currently giving you for future reference.

How can the Mamacse.f Trojan infect your computer?

Mamacse.f Trojan

The Mamacse.f Trojan can infect your OS in different ways.


There are many distribution methods which can deliver a Trojan like O97m/Mamacse.f inside your system, but some of the most popular are: malicious email attachments, spam campaigns, fake software updates, misleading ads, sites with pirated or illegal content, P2P networks, and third-party software download sources. In many cases, the hackers use spam campaigns which spread malicious attachments (usually Microsoft Office documents, PDF files, or .exe files) that, once opened, download and install the malicious software. Fake software updates may also be used to infect the system by exploiting errors in older software versions or by installing malware instead of the selected application update. P2P networks (torrents, freeware, shareware, etc.) and other unofficial software download sources (free download websites, file hosting websites, etc.) may sometimes also contain malicious executables which look like legitimate software but are in fact contaminated. That’s why one has to be very careful with the web content they interact with and only visit and use well-known and reputable sites and download sources.

Can i remove O97m/Mamacse.f myself?

The main reasons why so many web users get infected with threats like O97m/Mamacse.f is their lack of knowledge and caution. And since the Trojans can use many different distribution channels, many of which can be particularly deceiving and misleading, the key to safety is caution. We always advise our readers to be very careful when surfing the internet, especially when downloading and installing software. Analyze each attachment received in emails and if the file seems irrelevant or has been sent by an unknown sender, do not open it. We also recommend that you only download your apps and programs from official sources. This is because third-party installers or downloaders often include dubious programs and potentially unwanted components, which may, in turn, get exploited by dangerous malware. Last but not least, it is essential to use a reliable antivirus or antispyware solution. If you think your computer is infected with the O97m/Mamacse.f Trojan, we recommend running a scan with the professional removal tool from this page as it could help you remove the malware automatically.


Danger Level High (Trojans are often used as a backdoor for Ransomware)
Symptoms Trojans are very stealthy threats that usually hide their symptoms and cannot be detected without professional security software.
Distribution Method Spam, fake ads, malicious email attachments, infected websites and links, torrents, pirated content, cracked software.








O97m/Mamacse.f Trojan Removal

1: Preparations

Note: Before you go any further, we advise you to bookmark this page or have it open on a separate device such as your smartphone or another PC. Some of the steps might require you to exit your browser on this PC.

2: Task Manager

Press Ctrl + Shift + Esc to enter the Task Manager. Go to the Tab labeled Processes (Details for Win 8/10). Carefully look through the list of processes that are currently active on you PC.

If any of them seems shady, consumes too much RAM/CPU or has some strange description or no description at all, right-click on it, select Open File Location and delete everything there.

Also, even if you do not delete the files, be sure to stop the process by right-clicking on it and selecting End Process.

3: IP related to O97m/Mamacse.f

Go to c:\windows\system32\drivers\etc\hosts. Open the hosts file with notepad.

Find where it says Localhost and take a look below that. 

hosts_opt (1)

If you see any IP addresses there (below Localhost) send them to us here, in the comments since they might be coming from the O97m/Mamacse.f.


4: Disable Startup programs

Re-open the Start Menu and type msconfig.

Click on the first search result. In the next window, go to the Startup tab. If you are on Win 10,  it will send you to the Startup part of the task manager instead, as in the picture:

If you see any sketchy/shady looking entries in the list with an unknown manufacturer or a manufacturer name that looks suspicious as there could be a link between them and O97m/Mamacse.f , disable those programs and select OK.

5: Registry Editor

Press Windows key + R and in the resulting window type regedit.

Now, press Ctrl + F and type the name of the virus.

Delete everything that gets found. If you are not sure about whether to delete something, do not hesitate to ask us in the comments. Keep in mind that if you delete the wrong thing, you might cause all sorts of issues to your PC.

6: Deleting potentially malicious data – O97m/Mamacse.f

Type each of the following locations in the Windows search box and hit enter to open the locations:






Delete everything you see in Temp linked to O97m/Mamacse.fAbout the other folders, sort their contents by date and delete only the most recent entries. As always, if you are not sure about something, write to us in the comment section.

Daniel Sadakov

Daniel Sadakov has a degree in Information Technology and specializes in web and mobile cyber security. He harbors a strong detestation for anything and everything malicious and has committed his resources and time to battling all manners of web and mobile threats. He has founded, a website dedicated to covering the top tech stories and providing useful tips for the everyday user, in an effort to reach and help more people.

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