W32/VirRnsm-C

Written by Robert Bailey

What is W32/VirRnsm-C infection?

In this article you will certainly discover regarding the interpretation of W32/VirRnsm-C and its negative effect on your computer. Such ransomware are a type of malware that is elaborated by on the internet frauds to require paying the ransom by a sufferer.

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Most of the situations, W32/VirRnsm-C ransomware will advise its targets to start funds transfer for the function of reducing the effects of the changes that the Trojan infection has presented to the sufferer’s tool.

W32/VirRnsm-C Summary

These adjustments 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.
  • 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 found on the victim’s disk drive — so the victim can no longer use the data;
  • Preventing regular accessibility to the sufferer’s workstation;

W32/VirRnsm-C

The most regular networks whereby W32/VirRnsm-C Trojans 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 individual winding up on a source that organizes a harmful software program;

As quickly as the Trojan is effectively injected, it will certainly either cipher the data on the sufferer’s PC or avoid the device from functioning in a correct way – while also placing a ransom money note that mentions the need for the victims to effect the repayment for the function of decrypting the documents or bring back the file system back to the first problem. In most circumstances, the ransom note will certainly come up when the customer reboots the PC after the system has actually already been harmed.

W32/VirRnsm-C circulation channels.

In numerous edges of the globe, W32/VirRnsm-C grows by jumps as well as bounds. However, the ransom notes and methods of obtaining the ransom money quantity may differ relying on particular local (regional) settings. The ransom money notes as well as techniques of obtaining the ransom quantity might vary depending on specific neighborhood (local) settings.

Ransomware injection

As an example:

    Faulty notifies concerning unlicensed software program.

    In specific areas, the Trojans typically wrongfully report having actually identified some unlicensed applications made it possible for on the victim’s tool. The sharp then demands the individual to pay the ransom.

    Faulty declarations about prohibited material.

    In nations where software program piracy is much less prominent, this approach is not as efficient for the cyber scams. Conversely, the W32/VirRnsm-C popup alert might falsely declare to be originating from a police institution and will report having situated child pornography or other prohibited data on the device.

    W32/VirRnsm-C popup alert may wrongly claim to be acquiring from a regulation enforcement organization and also will certainly report having located child porn or various other illegal data on the tool. The alert will in a similar way contain a requirement for the individual to pay the ransom.

Technical details

File Info:

crc32: 21FBE2F3
md5: 8b8547df6ae9478aed9fbcae72c0472a
name: 8B8547DF6AE9478AED9FBCAE72C0472A.mlw
sha1: 908f721cfc586bc8d53f8adfee4fa8dbd7c2cea3
sha256: c9c0ba1be7422f879be71a4e23054727ac1c0efd0c5181f2c1e1708fbc198832
sha512: dfcf6ee9360281b910e72fd1f14a75ef963ba38eacfa4dfab284e1288b11cdfab72c38842ee7785b582096792b3f82b70bbd30dc5759e3ef2158936d46f93e9f
ssdeep: 12288:ZBTELB1VKQabir7v7jARDLN4NhgGMd4q7spcc/t5ZpxrUgdND8Kkp4uXCrGklPXo:nTELB1VzVrgD+FMKq7qcEZ3LWnGuXCro
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

W32/VirRnsm-C also known as:

GridinSoft Trojan.Ransom.Gen
Bkav HW32.Packed.
K7AntiVirus Virus ( 005662d71 )
DrWeb Win32.VirLock.10
CAT-QuickHeal Ransom.PolyRansom.B4
Cylance Unsafe
Zillya Virus.Virlock.Win32.1
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Virus:Win32/PolyRansom.43680aec
K7GW Virus ( 005662d71 )
Cybereason malicious.cfc586
TrendMicro PE_VIRLOCK.D
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
Kaspersky Virus.Win32.PolyRansom.b
NANO-Antivirus Trojan.Win32.Gena.doticp
SUPERAntiSpyware Ransom.Virlock/Variant
Tencent Virus.Win32.Polyransom.b
Sophos W32/VirRnsm-C
Comodo TrojWare.Win32.Virlock.XU@5xaovq
BitDefenderTheta Gen:NN.ZexaF.34110.UqW@aSeQSxai
VIPRE Virus.Win32.Nabucur.b (v)
Invincea heuristic
McAfee-GW-Edition BehavesLike.Win32.VirRansom.bc
Trapmine malicious.high.ml.score
FireEye Generic.mg.8b8547df6ae9478a
SentinelOne DFI – Malicious PE
F-Prot W32/S-7d685898!Eldorado
Endgame malicious (high confidence)
Avira TR/Crypt.ZPACK.Gen
eGambit Unsafe.AI_Score_99%
Antiy-AVL GrayWare/Win32.Virlock.a
Microsoft Virus:Win32/Nabucur.A
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
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]
Paloalto generic.ml
Qihoo-360 Virus.Win32.VirLock.D

How to remove W32/VirRnsm-C 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 W32/VirRnsm-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:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove W32/VirRnsm-C you can always ask me in the comments for getting help.

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References

  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/products/

About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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