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

What is BAT/TrojanDownloader.Agent.NOS infection?

In this article you will certainly find regarding the definition of BAT/TrojanDownloader.Agent.NOS and its adverse influence on your computer system. Such ransomware are a form of malware that is elaborated by online fraudulences to require paying the ransom by a target.

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In the majority of the situations, BAT/TrojanDownloader.Agent.NOS ransomware will advise its victims to initiate funds transfer for the purpose of counteracting the modifications that the Trojan infection has presented to the victim’s device.

BAT/TrojanDownloader.Agent.NOS Summary

These modifications can be as follows:

  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • A process created a hidden window;
  • Uses Windows utilities for basic functionality;
  • Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Attempts to disable Windows Defender;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers found on the target’s disk drive — so the victim can no longer utilize the data;
  • Preventing routine accessibility to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.


The most regular channels where BAT/TrojanDownloader.Agent.NOS Ransomware Trojans are infused are:

  • By means of phishing emails;
  • As an effect of individual ending up on a resource that hosts a destructive software;

As quickly as the Trojan is successfully infused, it will either cipher the information on the victim’s computer or prevent the device from functioning in an appropriate manner – while additionally positioning a ransom money note that points out the requirement for the sufferers to effect the payment for the objective of decrypting the records or restoring the documents system back to the preliminary problem. In many circumstances, the ransom note will come up when the customer restarts the PC after the system has already been damaged.

BAT/TrojanDownloader.Agent.NOS circulation networks.

In numerous corners of the globe, BAT/TrojanDownloader.Agent.NOS expands by jumps and bounds. However, the ransom notes and methods of obtaining the ransom quantity might differ relying on specific local (local) settings. The ransom notes and methods of extorting the ransom money quantity may vary depending on particular regional (regional) settings.

Ransomware injection

As an example:

    Faulty signals about unlicensed software.

    In certain areas, the Trojans commonly wrongfully report having spotted some unlicensed applications made it possible for on the victim’s gadget. The alert then requires the individual to pay the ransom.

    Faulty statements concerning prohibited web content.

    In countries where software program piracy is less preferred, this method is not as reliable for the cyber frauds. Conversely, the BAT/TrojanDownloader.Agent.NOS popup alert might incorrectly assert to be stemming from a police institution as well as will certainly report having situated child porn or various other illegal data on the device.

    BAT/TrojanDownloader.Agent.NOS popup alert might incorrectly assert to be obtaining from a legislation enforcement organization as well as will certainly report having located youngster pornography or other prohibited information on the gadget. The alert will similarly have a demand for the individual to pay the ransom.

Technical details

File Info:

crc32: 8A86D04D
md5: 4eba2f9240b8426e93e67355b7bc4b4a
name: severstal_map.exe
sha1: 2fcf540284abf952af898fcffa31255fd369afe3
sha256: 137233acebb1085a95e246044ee2b686a062c50f6208d2897dd2007154cb7115
sha512: 81ad23af1f4a8090b534af20b9ee5bd19c736dd12dd209c1f22e6f5e2e43c81a3e9ad4308f5cb63052a1eb1da57d6080f2a8e0e9aee1bd3502a3bdecc509baee
ssdeep: 98304:tw6/TWvutLdXgqlr4wFBvpAdgQfcIOUzsCQDXOFjHt:h/CvutP94WvpAdgYxWs
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

BAT/TrojanDownloader.Agent.NOS also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.SalideD.Trojan
MicroWorld-eScan Dropped:Trojan.GenericKD.30979805
CMC Trojan-Ransom.Win32!O
CAT-QuickHeal Trojan.Bitrep
ALYac Dropped:Trojan.GenericKD.30979805
Malwarebytes Trojan.Script.Generic
VIPRE Trojan.Win32.Generic!BT
AegisLab Trojan.Win32.Generic.4!c
BitDefender Dropped:Trojan.GenericKD.30979805
K7GW Riskware ( 0040eff71 )
K7AntiVirus Riskware ( 0040eff71 )
TrendMicro TROJ_GEN.R03FC0PF818
NANO-Antivirus Trojan.Win32.Mlw.fdxyfm
Cyren W32/Downloader.EDPR-8216
Symantec Trojan.Gen.2
TrendMicro-HouseCall TROJ_GEN.R03FC0PF818
GData Dropped:Trojan.GenericKD.30979805
Kaspersky HEUR:Trojan.Win32.Generic
Ad-Aware Dropped:Trojan.GenericKD.30979805
Sophos Mal/Generic-S
F-Secure Trojan.GenericKD.30979805
DrWeb Trojan.MulDrop8.49034
Invincea heuristic
McAfee-GW-Edition RDN/Generic Downloader.x
Emsisoft Dropped:Trojan.GenericKD.30979805 (B)
F-Prot W32/PsDownload.A
Avira TR/Dldr.Agent.mnanq
Antiy-AVL Trojan/Win32.Agent
Arcabit Trojan.Generic.D1D8B6DD
ZoneAlarm HEUR:Trojan.Win32.Generic
Microsoft Trojan:Win32/Occamy.B
AhnLab-V3 Malware/Win32.Generic.C2560692
McAfee Artemis!4EBA2F9240B8
MAX malware (ai score=98)
VBA32 Trojan.Bitrep
Panda Trj/CI.A
ESET-NOD32 BAT/TrojanDownloader.Agent.NOS
Tencent Bat.Trojan.Agent.Phha
Yandex Trojan.DL.Agent!Ta6sGHyACl4
Ikarus Trojan-Downloader.BAT.Agent
AVG Win32:Malware-gen
Avast Win32:Malware-gen
Qihoo-360 HEUR/QVM06.2.AD81.Malware.Gen

How to remove BAT/TrojanDownloader.Agent.NOS ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for BAT/TrojanDownloader.Agent.NOS files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

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If the guide doesn’t help you to remove BAT/TrojanDownloader.Agent.NOS you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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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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