Trojan:Win32/Cosmu.AC!MTB Virus Removal

What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

Spectating the Trojan:Win32/Cosmu.AC!MTB detection name means that your PC is in big danger. This malware can correctly be named as ransomware – sort of malware which encrypts your files and asks you to pay for their decryption. Stopping it requires some unusual steps that must be taken as soon as possible.

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Trojan:Win32/Cosmu.AC!MTB detection is a malware detection you can spectate in your system. It generally appears after the preliminary actions on your computer – opening the dubious e-mail, clicking the banner in the Web or mounting the program from dubious resources. From the moment it appears, you have a short time to do something about it until it begins its malicious action. And be sure – it is better not to await these malicious actions.

What is Trojan:Win32/Cosmu.AC!MTB virus?

Trojan:Win32/Cosmu.AC!MTB is ransomware-type malware. It looks for the documents on your computer, encrypts it, and after that asks you to pay the ransom for receiving the decryption key. Besides making your files locked, this malware additionally does a lot of harm to your system. It changes the networking setups in order to stop you from looking for the removal tutorials or downloading the antivirus. Sometimes, Trojan:Win32/Cosmu.AC!MTB can also prevent the setup of anti-malware programs.

Trojan:Win32/Cosmu.AC!MTB Summary

In summary, Trojan:Win32/Cosmu.AC!MTB malware activities in the infected system are next:

  • A file was accessed within the Public folder.;
  • Sample contains Overlay data;
  • Authenticode signature is invalid;
  • Ciphering the files kept on the victim’s drives — so the victim cannot open these documents;
  • Blocking the launching of .exe files of anti-malware apps
  • Blocking the launching of installation files of anti-virus programs

Ransomware has actually been a nightmare for the last 4 years. It is difficult to imagine a more harmful malware for both individual users and companies. The algorithms utilized in Trojan:Win32/Cosmu.AC!MTB (typically, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have a lot more time than our galaxy currently exists, and possibly will exist. However, that malware does not do all these unpleasant things without delay – it can require up to a few hours to cipher all of your documents. Therefore, seeing the Trojan:Win32/Cosmu.AC!MTB detection is a clear signal that you have to start the clearing process.

Where did I get the Trojan:Win32/Cosmu.AC!MTB?

Routine tactics of Trojan:Win32/Cosmu.AC!MTB distribution are basic for all other ransomware variants. Those are one-day landing web pages where victims are offered to download and install the free program, so-called bait e-mails and hacktools. Bait emails are a quite new tactic in malware spreading – you get the e-mail that mimics some routine notifications about shippings or bank service conditions updates. Inside of the e-mail, there is a corrupted MS Office file, or a link which opens the exploit landing page.

Malicious email spam

Malicious email message. This one tricks you to open the phishing website.

Avoiding it looks fairly uncomplicated, however, still demands tons of focus. Malware can hide in different places, and it is better to prevent it even before it gets into your PC than to trust in an anti-malware program. Common cybersecurity awareness is just an essential item in the modern-day world, even if your relationship with a computer stays on YouTube videos. That can save you a lot of money and time which you would certainly spend while looking for a solution.

Trojan:Win32/Cosmu.AC!MTB malware technical details

File Info:

name: 3856A62F7B0660F44D0D.mlw
path: /opt/CAPEv2/storage/binaries/6816657f165ad38045dbca298b40e141a611f09086296979c43719ee2b74d9ce
crc32: D4A8D2AE
md5: 3856a62f7b0660f44d0d52380819b1ad
sha1: e0684288f2945523a2969d742aeee67d5ad43ba6
sha256: 6816657f165ad38045dbca298b40e141a611f09086296979c43719ee2b74d9ce
sha512: 01d26dbef7920139a59df046fdd121ba2735e645faeec4e0342da3cf80f6c5dcf83cadc68eea38debe49ec24e1d0fd7e55503c74a31ac9e0a94b02270a4681c1
ssdeep: 768:uEaz5G7MaEtbwQpeyjaSLyfOPT4xcsrRA9Xu/IC4X3i2AH350azknSRXJuRWQlhw:v4GYUWeypTUuuQj635cSRU3iN/ntN7
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T171433A87EE5D40D0E6155A30896D237DCAB7947E4B30EBAB5788DD3C2837480EC3A769
sha3_384: e72ed52fee9f7b40eff0a646a07e1d330d0a3ed01bdc37fcec4cb461e55b298b16f49ab9bfc685e157e0f8936e242caf
ep_bytes: 558bec6aff68e0a5400068c886400064
timestamp: 2007-10-23 12:03:54

Version Info:

FileDescription: System File
FileVersion: 2, 0, 0, 1
InternalName: brdr
LegalCopyright: Copyright (C) 2007
OriginalFilename: Omer
ProductName: Browser Driver
ProductVersion: 2, 0, 0, 1
Translation: 0x0409 0x04b0

Trojan:Win32/Cosmu.AC!MTB also known as:

Elasticmalicious (high confidence)
K7AntiVirusAdware ( 004ca0081 )
K7GWAdware ( 004ca0081 )
AvastWin32:AdwareX-gen [Adw]
EmsisoftGen:Adware.Heur.dq1@IutA33ci (B)
SophosZenoSearch (PUA)
CynetMalicious (score: 100)
MAXmalware (ai score=68)
RisingTrojan.Win32.Mnless.zwo (CLASSIC)
SentinelOneStatic AI – Malicious PE
AVGWin32:AdwareX-gen [Adw]
CrowdStrikewin/grayware_confidence_90% (W)

How to remove Trojan:Win32/Cosmu.AC!MTB?

Trojan:Win32/Cosmu.AC!MTB malware is extremely difficult to eliminate manually. It puts its files in a variety of locations throughout the disk, and can recover itself from one of the parts. Moreover, a number of modifications in the registry, networking setups and Group Policies are really hard to discover and revert to the original. It is much better to make use of a specific program – exactly, an anti-malware tool. GridinSoft Anti-Malware will fit the most ideal for virus removal goals.

Remove Trojan:Win32/Cosmu.AC!MTB with Gridinsoft Anti-Malware

We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Trojans as shown from our tests with the software, and we assure you that it can remove Trojan:Win32/Cosmu.AC!MTB as well as other malware hiding on your computer.

Gridinsoft Anti-Malware - Main Screen

To use Gridinsoft for remove malicious threats, follow the steps below:

1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website

2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.


3.Follow the installation setup wizard's instructions diligently.

Gridinsoft Setup Wizard

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Scan for Trojan:Win32/Cosmu.AC!MTB Trojans

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.

5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

The Trojan:Win32/Cosmu.AC!MTB was Found

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

The Trojan:Win32/Cosmu.AC!MTB has been removed

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.

Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.

Trojan Killer for “Trojan:Win32/Cosmu.AC!MTB” removal on locked PC

In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

Trojan Killer - Main View

There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.

Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.

Step 1: Download & Install Trojan Killer on a Clean Computer:

1. Go to the official GridinSoft website ( and download Trojan Killer to a computer that is not infected.

Download Trojan Killer

2. Insert a USB flash drive into this computer.

3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

Install Trojan Killer to Removable Drive

4. Once the installation is complete, launch Trojan Killer.

Step 2: Update Signature Databases:

5. After launching Trojan Killer, ensure that your computer is connected to the Internet.

6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Click Update Button

Step 3: Scan the Infected PC:

7. Safely eject the USB flash drive from the clean computer.

8. Boot the infected computer to the Safe Mode.

9. Insert the USB flash drive.

10. Run tk.exe

11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Searching Trojan:Win32/Cosmu.AC!MTB Virus

Step 4: Remove Found Threats:

12. After the scan is complete, Trojan Killer will display a list of detected threats.

Searching Trojan:Win32/Cosmu.AC!MTB Finished

13. Click on "Cure PC!" to remove the identified malware from the infected PC.

14. Follow any additional on-screen prompts to complete the removal process.

Restart needed

Step 5: Restart Your Computer:

15. Once the threats are removed, click on "Restart PC" to reboot your computer.

16. Remove the USB flash drive from the infected computer.

Congratulations on effectively removing Trojan:Win32/Cosmu.AC!MTB and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.

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About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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