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

What is Win32/Virlock.H infection?

In this article you will locate concerning the interpretation of Win32/Virlock.H and its unfavorable impact on your computer system. Such ransomware are a form of malware that is clarified by on the internet frauds to demand paying the ransom money by a target.

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In the majority of the cases, Win32/Virlock.H virus will instruct its sufferers to initiate funds move for the objective of counteracting the changes that the Trojan infection has presented to the sufferer’s device.

Win32/Virlock.H Summary

These modifications can be as adheres to:

  • Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • A process created a hidden window;
  • Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic;
  • Performs some HTTP requests;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • A process attempted to delay the analysis task by a long amount of time.;
  • 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!
  • 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.
  • Likely virus infection of existing system binary;
  • 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;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Attempts to modify Explorer settings to prevent file extensions from being displayed;
  • Attempts to modify Explorer settings to prevent hidden files from being displayed;
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the documents situated on the sufferer’s hard drive — so the target can no longer use the information;
  • Preventing normal 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 normal channels where Win32/Virlock.H Ransomware Trojans are injected are:

  • By means of phishing emails;
  • As a repercussion of customer winding up on a source that organizes a destructive software program;

As soon as the Trojan is effectively injected, it will either cipher the information on the sufferer’s computer or stop the device from working in a correct way – while also positioning a ransom money note that discusses the requirement for the targets to effect the payment for the purpose of decrypting the documents or bring back the data system back to the first problem. In the majority of circumstances, the ransom money note will certainly turn up when the customer reboots the COMPUTER after the system has actually already been damaged.

Win32/Virlock.H circulation networks.

In numerous corners of the world, Win32/Virlock.H expands by jumps as well as bounds. However, the ransom money notes and also techniques of obtaining the ransom money amount might vary relying on specific regional (regional) setups. The ransom notes and also techniques of extorting the ransom amount may differ depending on specific local (regional) settings.

Ransomware injection

For example:

    Faulty informs regarding unlicensed software.

    In specific areas, the Trojans commonly wrongfully report having actually found some unlicensed applications enabled on the target’s gadget. The alert after that requires the user to pay the ransom.

    Faulty statements concerning unlawful content.

    In nations where software piracy is much less popular, this approach is not as reliable for the cyber frauds. Alternatively, the Win32/Virlock.H popup alert might falsely declare to be deriving from a police institution and will certainly report having located youngster pornography or other illegal data on the device.

    Win32/Virlock.H popup alert may wrongly claim to be deriving from a legislation enforcement organization and will certainly report having located child pornography or other unlawful data on the tool. The alert will similarly contain a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: 577B4068
md5: d37022238974b0fc3c06f18aa1e48856
name: D37022238974B0FC3C06F18AA1E48856.mlw
sha1: e9dbe427778548ad3474edb1e8cced3d44597db1
sha256: eb650c5110e5e7f8a998231c78ae6f8122c52d2c29dece1e982ab9695c4739ff
sha512: b4d979620cf03c443290a7f0129d5d9afb4bb9555117b0068b08f9d9599c7ef889d28e9366d72f1008157f923c36ca004d2c41b918357a3acc4af978a059157c
ssdeep: 98304:TgzQhyEuyO1kYMQKsu3RIt6OK7R33gkHOy6CyOmqvjpOryUukx8cbAtJaKBVfnY2:kUoboGk64pibKJVBJ+zHS
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Virlock.H also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Virus ( 005662d71 )
DrWeb Win32.VirLock.10
MicroWorld-eScan Win32.Virlock.Gen.1
ALYac Win32.Virlock.Gen.1
Cylance Unsafe
Zillya Virus.Virlock.Win32.1
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Virus:Win32/PolyRansom.583cdf1d
K7GW Virus ( 005662d71 )
Cybereason malicious.38974b
Baidu Win32.Virus.Virlock.a
Cyren W32/S-7d685898!Eldorado
Symantec W32.Virlock!inf4
ESET-NOD32 a variant of Win32/Virlock.H
APEX Malicious
TotalDefense Win32/Nabucur.C
Avast Win32:VirLock-B [Trj]
ClamAV Win.Virus.Virlock-6332874-0
GData Win32.Virlock.Gen.1
Kaspersky Virus.Win32.PolyRansom.b
BitDefender Win32.Virlock.Gen.1
NANO-Antivirus Trojan.Win32.Gena.doticp
Ad-Aware Win32.Virlock.Gen.1
Sophos W32/VirRnsm-C
Comodo TrojWare.Win32.Virlock.XU@5xaovq
F-Secure Trojan.TR/Crypt.XPACK.Gen7
BitDefenderTheta AI:FileInfector.4097910C13
VIPRE Virus.Win32.Nabucur.b (v)
Invincea heuristic
McAfee-GW-Edition BehavesLike.Win32.VirRansom.wc
Emsisoft Win32.Virlock.Gen.1 (B)
SentinelOne DFI – Malicious PE
F-Prot W32/S-7d685898!Eldorado
Endgame malicious (high confidence)
Avira TR/Crypt.XPACK.Gen7
eGambit Unsafe.AI_Score_99%
Antiy-AVL GrayWare/Win32.Virlock.a
Microsoft Trojan:Win32/Occamy.C
Jiangmin Trojan.Generic.euics
Arcabit Win32.Virlock.Gen.1
AegisLab Virus.Win32.PolyRansom.mfPW
ZoneAlarm Virus.Win32.PolyRansom.b
TACHYON Virus/W32.VirRansom
AhnLab-V3 Win32/Nabucur.C.X1541
Acronis suspicious
McAfee W32/VirRansom.b
MAX malware (ai score=81)
VBA32 Win32.Trojan.Dropper.Heur
Malwarebytes Trojan.VirLock
Panda Trj/Genetic.gen
TrendMicro-HouseCall PE_VIRLOCK.D
Rising Virus.VirLock!1.A08A (CLOUD)
Ikarus Virus.Win32.Virlock
MaxSecure Virus.PolyRansom.b
Fortinet W32/Virlock.D
AVG Win32:VirLock-B [Trj]
Qihoo-360 Virus.Win32.VirLock.D

How to remove Win32/Virlock.H 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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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/Virlock.H 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:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Win32/Virlock.H 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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