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

What is Virus.Win32.PolyRansom.b infection?

In this post you will certainly find concerning the meaning of Virus.Win32.PolyRansom.b and its unfavorable impact on your computer system. Such ransomware are a kind of malware that is elaborated by online frauds to require paying the ransom money by a sufferer.

GridinSoft Anti-Malware Review
It is better to prevent, than repair and repent!
When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
Gridinsoft Anti-Malware 6-day trial available.
EULA | Privacy Policy | 10% Off Coupon
Subscribe to our Telegram channel to be the first to know about news and our exclusive materials on information security.

In the majority of the instances, Virus.Win32.PolyRansom.b ransomware will certainly instruct its sufferers to initiate funds transfer for the purpose of neutralizing the modifications that the Trojan infection has introduced to the sufferer’s gadget.

Virus.Win32.PolyRansom.b Summary

These modifications can be as follows:

  • 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.
  • At least one process apparently crashed during execution;
  • 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 records located on the victim’s hard disk — so the sufferer can no longer use the information;
  • Preventing normal accessibility 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.
Similar behavior
Related domains Virus:Win32/PolyRansom.d7077e30 Virus:Win32/PolyRansom.d7077e30


One of the most normal networks whereby Virus.Win32.PolyRansom.b Ransomware Trojans are injected are:

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

As soon as the Trojan is effectively injected, it will either cipher the data on the sufferer’s PC or prevent the tool from working in an appropriate way – while likewise positioning a ransom money note that points out the requirement for the sufferers to impact the settlement for the function of decrypting the papers or bring back the data system back to the first condition. In the majority of instances, the ransom note will certainly show up when the customer restarts the PC after the system has actually currently been damaged.

Virus.Win32.PolyRansom.b circulation networks.

In different corners of the globe, Virus.Win32.PolyRansom.b expands by leaps and also bounds. However, the ransom notes and also tricks of obtaining the ransom amount might differ relying on certain local (regional) setups. The ransom money notes as well as methods of obtaining the ransom quantity might vary depending on specific neighborhood (regional) settings.

Ransomware injection

For example:

    Faulty alerts regarding unlicensed software.

    In certain areas, the Trojans usually wrongfully report having spotted some unlicensed applications allowed on the victim’s gadget. 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 popular, this method is not as effective for the cyber scams. Additionally, the Virus.Win32.PolyRansom.b popup alert might incorrectly declare to be originating from a law enforcement establishment and also will report having located child pornography or various other illegal information on the device.

    Virus.Win32.PolyRansom.b popup alert might wrongly assert to be acquiring from a regulation enforcement organization and will certainly report having located kid porn or various other prohibited information on the gadget. The alert will in a similar way consist of a need for the individual to pay the ransom money.

Technical details

File Info:

crc32: 5268AC7E
md5: 87e4435635d035dc7d3be4fcec9cc7c1
name: 87E4435635D035DC7D3BE4FCEC9CC7C1.mlw
sha1: 2cfadc79dc1ea29a56b3d89db85b087b01ff03a2
sha256: a1de40b9a49349b4010ef253917ca7cbeb8cad2789d5cc44fba5b0bf9ee666ee
sha512: c7ccf0bd597b99055b7c9209fff2812fb46ddac9a5495cf86802989e2b23f13b3fe893a98e070f7f826df51331f2a8c7fb1eb727b0bd9ba0bda3e482c598902b
ssdeep: 12288:TOoKneZW7qvoRXwnjPTdLPrUKCMnoC+4Ojw1/HsLUMNyCpO9PguGfDhLZ1vLrT4R:TOq0tyLZLjUCou1/HsLUX949fDFFORV
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Virus.Win32.PolyRansom.b also known as:

GridinSoft Trojan.Ransom.Gen
DrWeb Win32.VirLock.10
MicroWorld-eScan Win32.Virlock.Gen.1
ALYac Win32.Virlock.Gen.1
Cylance Unsafe
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Virus:Win32/PolyRansom.d7077e30
K7GW Virus ( 005662d71 )
K7AntiVirus Virus ( 005662d71 )
Baidu Win32.Virus.Virlock.a
Cyren W32/S-7d685898!Eldorado
Symantec W32.Virlock!inf4
ESET-NOD32 a variant of Win32/Virlock.D
Zoner Packer.Win32.Virlock
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
SUPERAntiSpyware Ransom.Virlock/Variant
Tencent Virus.Win32.Polyransom.b
Ad-Aware Win32.Virlock.Gen.1
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
Sophos W32/VirRnsm-C
SentinelOne DFI – Malicious PE
F-Prot W32/S-7d685898!Eldorado
Endgame malicious (high confidence)
Avira TR/Crypt.XPACK.Gen7
Antiy-AVL GrayWare/Win32.Virlock.a
Microsoft Virus:Win32/Nabucur.A
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=82)
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 Virus.Win32.PolyRansom.b virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft2

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 Virus.Win32.PolyRansom.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 Virus.Win32.PolyRansom.b you can always ask me in the comments for getting help.

User Review
0 (0 votes)
Comments Rating 0 (0 reviews)


  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.

Leave a Reply