Trojan:MSIL/AgentTesla.KAAY!MTB Virus Removal

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

Spectating the Trojan:MSIL/AgentTesla.KAAY!MTB detection means that your computer is in big danger. This computer virus can correctly be named as ransomware – type of malware which encrypts your files and forces you to pay for their decryption. Removing it requires some peculiar steps that must be taken as soon as possible.

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Trojan:MSIL/AgentTesla.KAAY!MTB detection is a malware detection you can spectate in your system. It often appears after the provoking activities on your computer – opening the dubious e-mail messages, clicking the advertisement in the Internet or mounting the program from dubious sources. From the moment it appears, you have a short time to take action until it begins its malicious action. And be sure – it is much better not to await these malicious effects.

What is Trojan:MSIL/AgentTesla.KAAY!MTB virus?

Trojan:MSIL/AgentTesla.KAAY!MTB is ransomware-type malware. It looks for the documents on your computer, ciphers it, and then asks you to pay the ransom for receiving the decryption key. Besides making your documents locked, this virus also does a ton of harm to your system. It alters the networking setups in order to avoid you from looking for the removal guides or downloading the anti-malware program. In rare cases, Trojan:MSIL/AgentTesla.KAAY!MTB can even block the setup of anti-malware programs.

Trojan:MSIL/AgentTesla.KAAY!MTB Summary

In summary, Trojan:MSIL/AgentTesla.KAAY!MTB ransomware activities in the infected PC are next:

  • CAPE extracted potentially suspicious content;
  • The binary likely contains encrypted or compressed data.;
  • Authenticode signature is invalid;
  • Encrypting the files kept on the victim’s drive — so the victim cannot check these documents;
  • Blocking the launching of .exe files of anti-malware programs
  • Blocking the launching of installation files of anti-virus programs

Ransomware has actually been a major problem for the last 4 years. It is challenging to imagine a more dangerous malware for both individual users and companies. The algorithms used in Trojan:MSIL/AgentTesla.KAAY!MTB (usually, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have more time than our galaxy already exists, and possibly will exist. However, that malware does not do all these terrible things instantly – it can require up to several hours to cipher all of your files. Hence, seeing the Trojan:MSIL/AgentTesla.KAAY!MTB detection is a clear signal that you should start the removal process.

Where did I get the Trojan:MSIL/AgentTesla.KAAY!MTB?

General ways of Trojan:MSIL/AgentTesla.KAAY!MTB injection are standard for all other ransomware variants. Those are one-day landing sites where victims are offered to download the free software, so-called bait emails and hacktools. Bait e-mails are a quite new method in malware spreading – you receive the e-mail that imitates some regular notifications about deliveries or bank service conditions changes. Within the e-mail, there is a malicious MS Office file, or a link which opens the exploit landing site.

Malicious email spam

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

Avoiding it looks pretty uncomplicated, however, still requires tons of attention. Malware can hide in various spots, and it is far better to stop it even before it invades your system than to trust in an anti-malware program. Common cybersecurity knowledge is just an essential thing in the modern world, even if your relationship with a PC stays on YouTube videos. That can keep you a great deal of money and time which you would spend while trying to find a fix guide.

Trojan:MSIL/AgentTesla.KAAY!MTB malware technical details

File Info:

name: FBB4A0492C72594DB184.mlw
path: /opt/CAPEv2/storage/binaries/cfddd10c5c0b92b1d3425b87d8d794903ffa8c9bf98a3ad27f0962462fd6436e
crc32: BEE04640
md5: fbb4a0492c72594db184bd011e1d0088
sha1: 1697176805458b5cce4b550c31b050c62a006c49
sha256: cfddd10c5c0b92b1d3425b87d8d794903ffa8c9bf98a3ad27f0962462fd6436e
sha512: 8592f5b057c5ff88d9b113e25b5ec361f3ab8a52a8b791b141b09328077565182374869810a18ebdd6305c6383fb90308efa9e7ca558c067cad1131f4f5edc20
ssdeep: 12288:GAfDuHOXSBQwap/c/JEzpqMqIdhSDnUygDtexvYHRBSQp87eIX1fGD:GgATaZVtS7UygAB2D
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1EC259DD1B15098DFEC6B45F2AD2A9D3020A3BE9D51A4400C55AB7B1B36F7382609FE1F
sha3_384: 8856aecf0acc40b66ce0a3cd65d30a46b324aac501dabca384fdc5d2ba7013aac6d52258395765bfa265ffa2a7c3fe78
ep_bytes: ff250020001100000000000000000000
timestamp: 2023-09-18 07:00:49

Version Info:

Translation: 0x0000 0x04b0
Comments: Utils
CompanyName: MySil
FileDescription: MessageBoxExLib
FileVersion: 1.2
InternalName: EXkD.exe
OriginalFilename: EXkD.exe
ProductName: MessageBox Editor
ProductVersion: 1.2
Assembly Version:

Trojan:MSIL/AgentTesla.KAAY!MTB also known as:

K7AntiVirusTrojan ( 005ab5c61 )
K7GWTrojan ( 005ab5c61 )
Elasticmalicious (high confidence)
ESET-NOD32a variant of MSIL/Kryptik.AJQQ
CynetMalicious (score: 100)
AvastWin32:PWSX-gen [Trj]
EmsisoftGen:Variant.Ransom.Loki.24223 (B)
SentinelOneStatic AI – Malicious PE
MAXmalware (ai score=85)
RisingMalware.Obfus/MSIL@AI.100 (RDM.MSIL2:37KLhUci9hIwd4qmOhlKVQ)
AVGWin32:PWSX-gen [Trj]
CrowdStrikewin/malicious_confidence_100% (W)

How to remove Trojan:MSIL/AgentTesla.KAAY!MTB?

Trojan:MSIL/AgentTesla.KAAY!MTB malware is very difficult to erase manually. It places its data in a variety of places throughout the disk, and can get back itself from one of the elements. Moreover, numerous modifications in the windows registry, networking settings and Group Policies are really hard to identify and return to the original. It is better to utilize a specific program – exactly, an anti-malware program. GridinSoft Anti-Malware will definitely fit the best for virus removal reasons.

Remove Trojan:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!MTB Virus

Step 4: Remove Found Threats:

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

Searching Trojan:MSIL/AgentTesla.KAAY!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:MSIL/AgentTesla.KAAY!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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