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

What is Win32/Filecoder.MedusaLocker.C infection?

In this short article you will discover regarding the definition of Win32/Filecoder.MedusaLocker.C as well as its unfavorable influence on your computer. Such ransomware are a form of malware that is clarified by on the internet frauds to require paying the ransom money by a target.

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In the majority of the cases, Win32/Filecoder.MedusaLocker.C virus will advise its victims to initiate funds move for the objective of reducing the effects of the changes that the Trojan infection has introduced to the victim’s gadget.

Win32/Filecoder.MedusaLocker.C Summary

These modifications can be as complies with:

  • Attempts to connect to a dead IP:Port (1 unique times);
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • A process created a hidden window;
  • Creates an autorun.inf file;
  • Uses Windows utilities for basic functionality;
  • Attempts to delete volume shadow copies;
  • 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!
  • Modifies boot configuration settings;
  • Installs itself for autorun at Windows startup. There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup. Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • 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.
  • Clears Windows events or logs;
  • Creates a copy of itself;
  • Attempts to disable UAC.

    User Account Control or just UAC is a part of the Windows security system which prevents apps from making unwanted changes on PC.

    UAC includes several technologies 1:

    • File and egistry Virtualization;
    • Same-desktop Elevation;
    • Filtered Token;
    • User Interface Privilege Isolation;
    • Protected Mode Internet Explorer;
    • Installer Detection;
  • Attempts to modify UAC prompt behavior;
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the papers situated on the sufferer’s hard disk drive — so the target can no longer make use of the data;
  • Preventing normal access to the sufferer’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 common networks where Win32/Filecoder.MedusaLocker.C are injected are:

  • By means of phishing e-mails;
  • As a repercussion of individual winding up on a resource that hosts a harmful software;

As soon as the Trojan is efficiently injected, it will certainly either cipher the data on the victim’s PC or protect against the gadget from functioning in a correct manner – while also positioning a ransom money note that states the demand for the sufferers to impact the settlement for the objective of decrypting the files or restoring the documents system back to the first problem. In many instances, the ransom note will certainly show up when the client restarts the COMPUTER after the system has currently been harmed.

Win32/Filecoder.MedusaLocker.C circulation channels.

In numerous corners of the world, Win32/Filecoder.MedusaLocker.C expands by leaps as well as bounds. Nevertheless, the ransom money notes and also techniques of extorting the ransom money amount may differ depending on certain local (regional) setups. The ransom money notes and methods of obtaining the ransom money quantity might differ depending on specific regional (regional) setups.

Ransomware injection

For instance:

    Faulty alerts regarding unlicensed software application.

    In certain locations, the Trojans usually wrongfully report having detected some unlicensed applications enabled on the target’s tool. The alert then requires the user to pay the ransom money.

    Faulty declarations regarding prohibited web content.

    In nations where software piracy is less popular, this technique is not as efficient for the cyber frauds. Alternatively, the Win32/Filecoder.MedusaLocker.C popup alert might wrongly claim to be deriving from a law enforcement institution as well as will report having located kid porn or various other unlawful information on the device.

    Win32/Filecoder.MedusaLocker.C popup alert might incorrectly claim to be acquiring from a law enforcement establishment and will report having situated child porn or various other prohibited information on the device. The alert will in a similar way consist of a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: 5D354B8E
md5: 4293f5b9957dc9e61247e6e1149e4c0f
name: 4293F5B9957DC9E61247E6E1149E4C0F.mlw
sha1: c87cd85d434e358b85f94cad098aa1f653d9cdbf
sha256: a8b84ab6489fde1fab987df27508abd7d4b30d06ab854b5fda37a277e89a2558
sha512: 789e02dbe1c82540471d1a2dc28e85dc0fc458aa10157b9f0f60bd5646cba0a990504d7551a75a10a1a071ae3fd2cde4f5d27bab61fef053f2bc9c502dfbe6e8
ssdeep: 12288:cPJ4UETYQivI2qZ7aSgLwkFVpzUvest4ZEbjJLuoJVoM7:JDTYVQ2qZ7aSgLwuVfstRJL7YM
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Filecoder.MedusaLocker.C also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.SerenaKR.Trojan
Elastic malicious (high confidence)
ClamAV Win.Ransomware.Medusalocker-9811271-0
McAfee GenericRXKP-XE!4293F5B9957D
Cylance Unsafe
VIPRE Trojan.Win32.Generic!BT
AegisLab Trojan.Win32.DelShad.trwZ
Sangfor Trojan.Win32.Save.a
K7AntiVirus Trojan ( 0055a9531 )
BitDefender Generic.Ransom.MedusaLocker.942644D7
K7GW Trojan ( 0055a9531 )
Cybereason malicious.9957dc
Arcabit Generic.Ransom.MedusaLocker.942644D7
Cyren W32/Ransom.OB.gen!Eldorado
Symantec Ransom.Cryptolocker
APEX Malicious
Cynet Malicious (score: 100)
Kaspersky Trojan-Ransom.Win32.Medusa.aj
Alibaba Ransom:Win32/MedusaLocker.cd1a3577
NANO-Antivirus Trojan.Win32.Filecoder.hjdojw
MicroWorld-eScan Generic.Ransom.MedusaLocker.942644D7
Tencent Malware.Win32.Gencirc.10cdcb68
Ad-Aware Generic.Ransom.MedusaLocker.942644D7
Sophos Mal/Generic-S
Comodo Malware@#2exn368ws85cy
F-Secure Trojan.TR/AD.MedusaRansom.yvkui
DrWeb Trojan.DownLoader33.34694
Zillya Trojan.DelShad.Win32.481
TrendMicro Ransom.Win32.MEDUSALOCKER.SMTH
McAfee-GW-Edition BehavesLike.Win32.Injector.jh
MaxSecure Trojan.Malware.88792205.susgen
Emsisoft Generic.Ransom.MedusaLocker.942644D7 (B)
SentinelOne Static AI – Suspicious PE
Jiangmin Trojan.DelShad.vv
Webroot W32.Trojan.Gen
Avira TR/AD.MedusaRansom.yvkui
MAX malware (ai score=100)
Antiy-AVL Trojan[Ransom]/Win32.Ako
Microsoft Ransom:Win32/MedusaLocker.A!MTB
ViRobot Trojan.Win32.Medusa.694784
ZoneAlarm Trojan-Ransom.Win32.Medusa.aj
GData Win32.Trojan-Ransom.Filecoder.BO
AhnLab-V3 Malware/Win32.RL_Generic.R335910
VBA32 Trojan.DelShad
ALYac Trojan.Ransom.MedusaLocker
Malwarebytes Ransom.Medusa
Panda Trj/GdSda.A
ESET-NOD32 a variant of Win32/Filecoder.MedusaLocker.C
TrendMicro-HouseCall Ransom.Win32.MEDUSALOCKER.SMTH
Rising Ransom.Medusa!1.C21A (CLOUD)
Yandex Trojan.Filecoder!IKimDDCJuYs
Ikarus Trojan-Ransom.Medusalocker
eGambit Unsafe.AI_Score_96%
Fortinet W32/Filecoder.NYA!tr.ransom
BitDefenderTheta Gen:NN.ZexaF.34590.QuW@aK8T6Ili
AVG Win32:RansomX-gen [Ransom]
Avast Win32:RansomX-gen [Ransom]
CrowdStrike win/malicious_confidence_100% (W)
Qihoo-360 Win32/Trojan.294

How to remove Win32/Filecoder.MedusaLocker.C virus?

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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There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft3.

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 Win32/Filecoder.MedusaLocker.C 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 Win32/Filecoder.MedusaLocker.C you can always ask me in the comments for getting help.

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  1. Microsoft Ignite: How to disable User Account Control (UAC) on Windows Server
  2. GridinSoft Anti-Malware Review from HowToFix site:
  3. More information about GridinSoft products:

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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