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

What is Ransom:Win32/Ryuk.F infection?

In this article you will certainly find about the meaning of Ransom:Win32/Ryuk.F and also its unfavorable effect on your computer. Such ransomware are a kind of malware that is clarified by on the internet frauds to require paying the ransom by a target.

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In the majority of the instances, Ransom:Win32/Ryuk.F infection will certainly instruct its sufferers to initiate funds transfer for the objective of counteracting the changes that the Trojan infection has introduced to the target’s tool.

Ransom:Win32/Ryuk.F Summary

These alterations 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.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Exhibits possible ransomware file modification behavior;
  • Writes a potential ransom message to disk;
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Likely virus infection of existing system binary;
  • Creates a copy of itself;
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the files found on the sufferer’s hard disk drive — so the sufferer can no more make use of the information;
  • Preventing normal access to the victim’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 channels whereby Ransom:Win32/Ryuk.F Ransomware are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a consequence of customer ending up on a source that holds a destructive software program;

As soon as the Trojan is effectively infused, it will either cipher the information on the target’s computer or protect against the tool from functioning in a proper way – while additionally positioning a ransom note that mentions the need for the sufferers to effect the repayment for the function of decrypting the records or restoring the documents system back to the initial condition. In the majority of circumstances, the ransom note will come up when the client restarts the PC after the system has already been damaged.

Ransom:Win32/Ryuk.F circulation channels.

In various corners of the globe, Ransom:Win32/Ryuk.F grows by leaps and also bounds. However, the ransom money notes as well as tricks of extorting the ransom quantity may differ depending upon certain regional (local) setups. The ransom notes and also tricks of obtaining the ransom money quantity may differ depending on particular regional (local) settings.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software application.

    In certain areas, the Trojans usually wrongfully report having actually found some unlicensed applications allowed on the sufferer’s gadget. The alert after that requires the user to pay the ransom money.

    Faulty statements about prohibited content.

    In nations where software program piracy is less prominent, this approach is not as reliable for the cyber frauds. Additionally, the Ransom:Win32/Ryuk.F popup alert might wrongly assert to be stemming from a police establishment and will report having situated kid porn or various other prohibited information on the tool.

    Ransom:Win32/Ryuk.F popup alert might falsely claim to be acquiring from a legislation enforcement establishment and also will report having located youngster porn or other unlawful information on the tool. The alert will similarly consist of a need for the customer to pay the ransom.

Technical details

File Info:

crc32: 2EA9C9BC
md5: a905c90f5212496192669a19bb9afb1d
name: A905C90F5212496192669A19BB9AFB1D.mlw
sha1: df157444c70e9b4d6141a7cdb969162c5d567f77
sha256: cca8cd17db66bcb357c054d893e5162deed0cb35cf45af09bb269f61e335a699
sha512: 08b716aa4b3d0338f2f303d5481b84ca5e5957e00aa10b103a8c8a2953fdad77c6e83ea56212381790d2827a664c75210b8ac97179e8c799f0bafa8437f32a77
ssdeep: 12288:UvNPfFgyDHjsngVNpX+prJFpdZi05r/nmNs45oNnihjIsbE5o7j:ggOlNAJi05MvBb6O
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Copyright (C) 2001
InternalName: GetUserNames
FileVersion: 1, 0, 0, 1
ProductName: GetUserNames Application
ProductVersion: 1, 0, 0, 1
FileDescription: GetUserNames MFC Application
OriginalFilename: GetUserNames.EXE
Translation: 0x0409 0x04b0

Ransom:Win32/Ryuk.F also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
Elastic malicious (high confidence)
DrWeb Trojan.DownLoad4.14248
Qihoo-360 Win32/Trojan.Generic.HwcBkBsB
McAfee Emotet-FRP!A905C90F5212
Malwarebytes Generic.Malware/Suspicious
VIPRE Trojan.Win32.Generic!BT
Sangfor Trojan.Win32.Save.a
BitDefender Gen:Variant.Zusy.368979
K7GW Trojan ( 005787d51 )
CrowdStrike win/malicious_confidence_100% (W)
Arcabit Trojan.Zusy.D5A153
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kryptik.HJNE
APEX Malicious
Alibaba Ransom:Win32/Ryuk.ali1020007
MicroWorld-eScan Gen:Variant.Zusy.368979
Rising Ransom.Ryuk!8.10431 (CLOUD)
Ad-Aware Gen:Variant.Zusy.368979
Emsisoft Gen:Variant.Zusy.368979 (B)
TrendMicro Ransom_Ryuk.R002C0DBR21
McAfee-GW-Edition BehavesLike.Win32.Emotet.jh
FireEye Generic.mg.a905c90f52124961
Sophos Mal/Generic-S
MAX malware (ai score=85)
Microsoft Ransom:Win32/Ryuk.F
GData Gen:Variant.Zusy.368979
AhnLab-V3 Malware/Win32.Generic.C4346173
ALYac Gen:Variant.Zusy.368979
Cylance Unsafe
Panda Trj/CI.A
TrendMicro-HouseCall Ransom_Ryuk.R002C0DBR21
Ikarus Win32.Outbreak
Fortinet W32/Kryptik.HJNE!tr
AVG Win32:RansomX-gen [Ransom]
Avast Win32:RansomX-gen [Ransom]

How to remove Ransom:Win32/Ryuk.F 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 GridinSoft2.

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 Ransom:Win32/Ryuk.F 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 Ransom:Win32/Ryuk.F you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
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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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