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

What is Ransom:Win32/Grymegat.B infection?

In this short article you will certainly discover concerning the meaning of Ransom:Win32/Grymegat.B and its negative influence on your computer system. Such ransomware are a form of malware that is specified by on-line frauds to require paying the ransom by a victim.

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In the majority of the instances, Ransom:Win32/Grymegat.B ransomware will certainly instruct its targets to start funds move for the function of reducing the effects of the modifications that the Trojan infection has presented to the sufferer’s tool.

Ransom:Win32/Grymegat.B Summary

These adjustments can be as adheres to:

  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Attempts to connect to a dead IP:Port (1 unique times);
  • 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.
  • Possible date expiration check, exits too soon after checking local time;
  • 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.
  • Unconventionial language used in binary resources: Spanish (El Salvador);
  • Uses Windows utilities for basic functionality;
  • Executed a process and injected code into it, probably while unpacking;
  • 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 or sets a registry key to a long series of bytes, possibly to store a binary or malware config;
  • 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.
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Operates on local firewall’s policies and settings;
  • 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;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the documents located on the victim’s disk drive — so the target can no more make use of the information;
  • 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.
Similar behavior
Related domains
z.whorecord.xyz Trojan.Ransomlock!g21
a.tomx.xyz Trojan.Ransomlock!g21
warrantynetwork.co.in Trojan.Ransomlock!g21


One of the most typical networks whereby Ransom:Win32/Grymegat.B Ransomware are injected are:

  • By means of phishing e-mails;
  • As an effect of customer ending up on a resource that holds a harmful software;

As soon as the Trojan is efficiently injected, it will certainly either cipher the information on the victim’s PC or prevent the gadget from working in a correct way – while also placing a ransom note that states the demand for the targets to effect the repayment for the function of decrypting the files or restoring the data system back to the initial condition. In many circumstances, the ransom money note will show up when the customer reboots the COMPUTER after the system has currently been damaged.

Ransom:Win32/Grymegat.B distribution channels.

In numerous corners of the world, Ransom:Win32/Grymegat.B expands by jumps and bounds. Nonetheless, the ransom notes and methods of extorting the ransom money amount might differ depending on certain neighborhood (local) setups. The ransom notes and also techniques of obtaining the ransom amount might differ depending on certain regional (regional) settings.

Ransomware injection

For instance:

    Faulty informs concerning unlicensed software.

    In certain areas, the Trojans frequently wrongfully report having spotted some unlicensed applications enabled on the target’s tool. The sharp then requires the user to pay the ransom money.

    Faulty statements concerning prohibited material.

    In countries where software program piracy is much less preferred, this method is not as reliable for the cyber scams. Conversely, the Ransom:Win32/Grymegat.B popup alert may wrongly declare to be deriving from a law enforcement establishment as well as will report having situated youngster porn or other prohibited data on the device.

    Ransom:Win32/Grymegat.B popup alert might incorrectly claim to be obtaining from a law enforcement organization and will report having situated child pornography or other illegal data on the device. The alert will similarly consist of a demand for the individual to pay the ransom money.

Technical details

File Info:

crc32: C6774A15
md5: 0c577a1dc4975765d23bfdae0d721fa0
name: 0C577A1DC4975765D23BFDAE0D721FA0.mlw
sha1: f60c3ad30b805daca607d663b5b26f9493a1f9c3
sha256: 4fdcff576232f30dfe46fd9df02323d6846ab676a42a57d777a507ad26f46346
sha512: ad43b7bf0ee9964755a95669afa89b74c9915f4fbec02e07e0c0b4c730b664c8854f649157a08d977d07ecf5dc09f577b7d00438617c27b3b630ce302c3ef6eb
ssdeep: 3072:kt0ZqVocYKCcYdNEeL9lHg6JuvhAcRu7:kt0ZqmcYxvLL9W6JCL
type: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows

Version Info:

LegalCopyright: Copyright (c) 2009 IBM.com All Rights Reserved
InternalName: IBM
FileVersion: 3.00.009
CompanyName: www.IBM.com
LegalTrademarks: IBM.com
Comments: IBM - microprocessor emulator
ProductName: IBM Microprocessor Emulator
ProductVersion: 3.00.009
FileDescription: IBM
OriginalFilename: IBM.exe
Translation: 0x0409 0x04b0

Ransom:Win32/Grymegat.B also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader7.26582
MicroWorld-eScan Gen:Heur.Zygug.6
FireEye Generic.mg.0c577a1dc4975765
ALYac Gen:Heur.Zygug.6
Cylance Unsafe
VIPRE Trojan.Win32.Encpk.ahq (v)
Sangfor Trojan.Win32.Save.a
K7AntiVirus Trojan ( 0040f1d41 )
BitDefender Gen:Heur.Zygug.6
K7GW Trojan ( 0040f1d41 )
Cybereason malicious.dc4975
BitDefenderTheta Gen:NN.ZexaF.34590.hG0@aehE9XhO
Symantec Trojan.Ransomlock!g21
APEX Malicious
Avast Win32:Cryptor
Kaspersky HEUR:Trojan.Win32.Generic
Alibaba Ransom:Win32/Grymegat.0f124591
NANO-Antivirus Virus.Win32.Gen-Crypt.ccnc
AegisLab Trojan.Win32.Generic.lEkh
Rising Ransom.Grymegat!8.3182 (CLOUD)
Ad-Aware Gen:Heur.Zygug.6
Sophos ML/PE-A + Mal/EncPk-AHQ
Comodo TrojWare.Win32.PWS.ZBot.AAA@4sq88d
F-Secure Trojan.TR/Dropper.Gen7
Zillya Dropper.Dycler.Win32.108
McAfee-GW-Edition BehavesLike.Win32.PUPInstaller.ch
Emsisoft Gen:Heur.Zygug.6 (B)
SentinelOne Static AI – Suspicious PE
Jiangmin Trojan.Generic.dvmwl
Avira TR/Dropper.Gen7
Antiy-AVL Trojan/Win32.AGeneric
Kingsoft Win32.Troj.Dycler.sv.(kcloud)
Microsoft Ransom:Win32/Grymegat.B
Arcabit Trojan.Zygug.6
ZoneAlarm HEUR:Trojan.Win32.Generic
GData Gen:Heur.Zygug.6
Cynet Malicious (score: 90)
AhnLab-V3 Trojan/Win32.Ransomlock.R43576
McAfee Ransom-AAY.gen.k
MAX malware (ai score=100)
VBA32 BScope.Malware-Cryptor.Oop
Malwarebytes Generic.Malware/Suspicious
Panda Generic Malware
ESET-NOD32 a variant of Win32/Injector.YFO
TrendMicro-HouseCall TROJ_RANSOM.SMWX
Tencent Win32.Trojan.Generic.Glr
Yandex Trojan.Injector!mfBdsIIoqPM
Ikarus Trojan.Win32.Tobfy
eGambit Generic.Malware
Fortinet W32/RANSOM.AAY!tr
Webroot Trojan.Dropper.Gen
AVG Win32:Cryptor
Paloalto generic.ml
CrowdStrike win/malicious_confidence_70% (W)
Qihoo-360 Win32/Ransom.Generic.HwQAynsA

How to remove Ransom:Win32/Grymegat.B 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 Ransom:Win32/Grymegat.B 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 Ransom:Win32/Grymegat.B 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: https://howtofix.guide/gridinsoft-anti-malware/
  3. More information about GridinSoft products: https://gridinsoft.com/comparison

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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