NSIS/TrojanDownloader.Agent.OBN Virus Removal

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

Seeing the NSIS/TrojanDownloader.Agent.OBN detection name means that your system is in big danger. This malware can correctly be identified as ransomware – virus which ciphers your files and forces you to pay for their decryption. Removing it requires some specific steps that must be taken as soon as possible.

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NSIS/TrojanDownloader.Agent.OBN detection is a virus detection you can spectate in your system. It usually appears after the provoking activities on your PC – opening the dubious email, clicking the banner in the Web or installing the program from suspicious resources. From the instance it shows up, you have a short time to do something about it before it starts its harmful activity. And be sure – it is better not to await these harmful things.

What is NSIS/TrojanDownloader.Agent.OBN virus?

NSIS/TrojanDownloader.Agent.OBN is ransomware-type malware. It searches for the files on your disks, 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 damage to your system. It changes the networking setups in order to prevent you from reading the elimination guidelines or downloading the anti-malware program. In some cases, NSIS/TrojanDownloader.Agent.OBN can additionally stop the setup of anti-malware programs.

NSIS/TrojanDownloader.Agent.OBN Summary

Summarizingly, NSIS/TrojanDownloader.Agent.OBN ransomware activities in the infected PC are next:

  • Sample contains Overlay data;
  • Performs HTTP requests potentially not found in PCAP.;
  • Reads data out of its own binary image;
  • Authenticode signature is invalid;
  • Attempts to modify proxy settings;
  • Deletes executed files from disk;
  • Encrypting the files kept on the target’s disks — so the victim cannot use these files;
  • Blocking the launching of .exe files of security tools
  • Blocking the launching of installation files of anti-malware apps

Ransomware has been a horror story for the last 4 years. It is hard to picture a more damaging malware for both individuals and businesses. The algorithms utilized in NSIS/TrojanDownloader.Agent.OBN (usually, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need more time than our galaxy currently exists, and possibly will exist. However, that virus does not do all these bad things without delay – it can take up to several hours to cipher all of your files. Thus, seeing the NSIS/TrojanDownloader.Agent.OBN detection is a clear signal that you must start the clearing procedure.

Where did I get the NSIS/TrojanDownloader.Agent.OBN?

Typical tactics of NSIS/TrojanDownloader.Agent.OBN injection are typical for all other ransomware variants. Those are one-day landing websites where users are offered to download and install the free app, so-called bait emails and hacktools. Bait e-mails are a pretty modern method in malware distribution – you get the e-mail that imitates some regular notifications about shippings or bank service conditions changes. Within the email, there is a malicious 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 uncomplicated, but still requires a lot of focus. Malware can hide in various places, and it is better to stop it even before it goes into your computer than to trust in an anti-malware program. Standard cybersecurity knowledge is just an essential item in the modern-day world, even if your interaction with a PC stays on YouTube videos. That may save you a lot of time and money which you would certainly spend while searching for a solution.

NSIS/TrojanDownloader.Agent.OBN malware technical details

File Info:

name: D8C01F57D0CADAC3AE91.mlw
path: /opt/CAPEv2/storage/binaries/09e677fa0ac11d79e5acf4613d6deb767b04e40e94c6eba152602e63a29a8112
crc32: 9833C8B1
md5: d8c01f57d0cadac3ae9105299063a5b7
sha1: 69bebb4a2725a6c6065ee024959e18f1172b102f
sha256: 09e677fa0ac11d79e5acf4613d6deb767b04e40e94c6eba152602e63a29a8112
sha512: ced779d7504283a99fe32d278e87a02cb9e41898c77c03ed5886006c4e3f2e201f27255f7b85123a14fb5c6c3be15dc76415ad2ba149f1c13f2da64aa5dfdb1f
ssdeep: 6144:bfL+oqaAAaB+OLFGCZssey0BQdf5+Ew2OtuXHH:bfLZA8MGCZsKsQxw2OtuXH
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T18B541221E750C03ADBB21732953B77EB4BFB98251690674303607E3EBDB2909821FE59
sha3_384: 4cbf6a4a63dc983276bd594771fa611c4c45dc8d99f4be6bc9b2f8f7bc42e1734698bd5b36fb13f92d512226831c2be0
ep_bytes: 81ecf80300005556576a205f33ed6801
timestamp: 2023-07-02 02:09:48

Version Info:

0: [No Data]

NSIS/TrojanDownloader.Agent.OBN also known as:

Elasticmalicious (high confidence)
CrowdStrikewin/malicious_confidence_60% (D)
AvastNSIS:DropperX-gen [Drp]
EmsisoftGen:Variant.Ransom.Loki.1155 (B)
SophosGeneric ML PUA (PUA)
MAXmalware (ai score=81)
CynetMalicious (score: 99)
VBA32suspected of Trojan.Downloader.gen
AVGNSIS:DropperX-gen [Drp]

How to remove NSIS/TrojanDownloader.Agent.OBN?

NSIS/TrojanDownloader.Agent.OBN malware is incredibly hard to remove by hand. It stores its documents in numerous places throughout the disk, and can recover itself from one of the elements. Additionally, a range of changes in the registry, networking configurations and Group Policies are really hard to identify and revert to the original. It is far better to make use of a specific app – exactly, an anti-malware tool. GridinSoft Anti-Malware will definitely fit the best for malware removal purposes.

Remove NSIS/TrojanDownloader.Agent.OBN 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 NSIS/TrojanDownloader.Agent.OBN 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 gridinsoft.com.

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 NSIS/TrojanDownloader.Agent.OBN 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 NSIS/TrojanDownloader.Agent.OBN 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 NSIS/TrojanDownloader.Agent.OBN 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 “NSIS/TrojanDownloader.Agent.OBN” 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 (gridinsoft.com) 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 NSIS/TrojanDownloader.Agent.OBN Virus

Step 4: Remove Found Threats:

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

Searching NSIS/TrojanDownloader.Agent.OBN 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 NSIS/TrojanDownloader.Agent.OBN 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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