Trojan:Win32/Koobface.K Virus Removal

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

Seeing the Trojan:Win32/Koobface.K detection name usually means that your computer is in big danger. This computer virus can correctly be identified as ransomware – virus which ciphers your files and forces you to pay for their decryption. Deleteing it requires some unusual steps that must be taken as soon as possible.

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Trojan:Win32/Koobface.K detection is a virus detection you can spectate in your computer. It usually shows up after the preliminary activities on your computer – opening the untrustworthy email, clicking the advertisement in the Internet or setting up the program from suspicious sources. From the second it shows up, you have a short time to act before it starts its harmful activity. And be sure – it is better not to await these malicious actions.

What is Trojan:Win32/Koobface.K virus?

Trojan:Win32/Koobface.K is ransomware-type malware. It looks for the documents on your disk drive, ciphers it, and after that asks you to pay the ransom for getting the decryption key. Besides making your files locked, this malware also does a lot of harm to your system. It modifies the networking settings in order to prevent you from looking for the elimination tutorials or downloading the anti-malware program. In some cases, Trojan:Win32/Koobface.K can additionally block the setup of anti-malware programs.

Trojan:Win32/Koobface.K Summary

In total, Trojan:Win32/Koobface.K virus activities in the infected computer are next:

  • Sample contains Overlay data;
  • Unconventionial binary language: Russian;
  • Unconventionial language used in binary resources: Russian;
  • The binary contains an unknown PE section name indicative of packing;
  • The binary likely contains encrypted or compressed data.;
  • The executable is compressed using UPX;
  • Authenticode signature is invalid;
  • Yara detections observed in process dumps, payloads or dropped files;
  • Encrypting the documents located on the target’s disk — so the victim cannot open these files;
  • Blocking the launching of .exe files of anti-malware programs
  • Blocking the launching of installation files of security tools

Ransomware has been a major problem for the last 4 years. It is difficult to picture a more dangerous malware for both individual users and businesses. The algorithms utilized in Trojan:Win32/Koobface.K (generally, 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 already exists, and possibly will exist. However, that virus does not do all these bad things immediately – it can require up to a few hours to cipher all of your files. Therefore, seeing the Trojan:Win32/Koobface.K detection is a clear signal that you must begin the removal procedure.

Where did I get the Trojan:Win32/Koobface.K?

Usual ways of Trojan:Win32/Koobface.K injection are standard for all other ransomware variants. Those are one-day landing sites where users are offered to download the free software, so-called bait e-mails and hacktools. Bait e-mails are a pretty new tactic in malware distribution – you receive the e-mail that imitates some standard notifications about deliveries or bank service conditions modifications. Inside of the email, there is an infected MS Office file, or a web link which opens the exploit landing site.

Malicious email spam

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

Preventing it looks quite easy, but still demands a lot of awareness. Malware can hide in various places, and it is far better to prevent it even before it goes into your PC than to rely upon an anti-malware program. Simple cybersecurity awareness is just an important thing in the modern-day world, even if your relationship with a PC stays on YouTube videos. That can save you a great deal of time and money which you would certainly spend while seeking a fixing guide.

Trojan:Win32/Koobface.K malware technical details

File Info:

name: 18812D503DEE9ACC26BA.mlw
path: /opt/CAPEv2/storage/binaries/032a8e35be5406d2b61287ad40a91eb5aa6178f36da9a432ee2a3528fd953e7d
crc32: B8A5E954
md5: 18812d503dee9acc26baf353d58a5462
sha1: e33364c1200b8cc79a7a68b819000b51e5d83669
sha256: 032a8e35be5406d2b61287ad40a91eb5aa6178f36da9a432ee2a3528fd953e7d
sha512: fe1885eb7b060e90b8d6b6c7f2ed95272e2f8125ef9e8b0553d9df858ff57dfc1dce2f0a9a8d2bebc3af38f63c229955384058c60430bc3d1738b90182e23e4c
ssdeep: 1536:YoYHOJZGCzsDor44jCojxkwaknRFHQAAD8lco+T1ikF0kBpUx:Yoj3z44jC4xkhkRFwP4lL+T1ikvpUx
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1B643F215EEA9481FF19B5EB200DB4FD3307B718EDF5A0BA80E4A902639748CC25D6D79
sha3_384: dfa61816b4cf918d5f23201b2c628b1b0a6ad9d20fab59d0348bb500a6dce48e2ac3b4179026a702f309cb950e560ed6
ep_bytes: 60be006041008dbe00b0feff57eb0b90
timestamp: 2011-04-28 12:59:11

Version Info:

CompanyName: Windows Service
FileDescription: Windows Service
InternalName: Notify
LegalCopyright: Copyright (C) 2011
ProductName: Windows Service
Translation: 0x0419 0x04b0

Trojan:Win32/Koobface.K also known as:

K7AntiVirusRiskware ( 0040eff71 )
K7GWRiskware ( 0040eff71 )
Elasticmalicious (moderate confidence)
ESET-NOD32a variant of Win32/Spammer.Agent.J
AvastWin32:Downloader-GQF [Trj]
EmsisoftGen:Variant.Ransom.Nemty.17 (B)
SentinelOneStatic AI – Malicious PE
CynetMalicious (score: 100)
MAXmalware (ai score=100)
RisingTrojan.Koobface!8.CD6 (TFE:5:1oO4FbbcIeP)
AVGWin32:Downloader-GQF [Trj]
CrowdStrikewin/malicious_confidence_100% (W)

How to remove Trojan:Win32/Koobface.K?

Trojan:Win32/Koobface.K malware is extremely difficult to delete manually. It places its files in multiple places throughout the disk, and can recover itself from one of the elements. Furthermore, various changes in the windows registry, networking configurations and also Group Policies are pretty hard to discover and change to the original. It is far better to make use of a specific tool – exactly, an anti-malware tool. GridinSoft Anti-Malware will fit the most ideal for virus removal goals.

Remove Trojan:Win32/Koobface.K 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/Koobface.K 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/Koobface.K 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/Koobface.K 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/Koobface.K 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/Koobface.K” 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/Koobface.K Virus

Step 4: Remove Found Threats:

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

Searching Trojan:Win32/Koobface.K 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/Koobface.K 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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