Win32/Virlock.W

What is Win32/Virlock.W infection?

In this post you will certainly find concerning the definition of Win32/Virlock.W as well as its negative influence on your computer. Such ransomware are a form of malware that is clarified by on the internet scams to require paying the ransom money by a victim.

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In the majority of the cases, Win32/Virlock.W infection will certainly instruct its targets to launch funds transfer for the objective of counteracting the modifications that the Trojan infection has actually introduced to the victim’s gadget.

Win32/Virlock.W 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.
  • Expresses interest in specific running processes;
  • 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.
  • 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;
  • 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 target’s disk drive — so the target can no more use the data;
  • 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.

Win32/Virlock.W

One of the most normal networks whereby Win32/Virlock.W Ransomware Trojans are infused are:

  • By ways of phishing emails;
  • As a repercussion of customer winding up on a resource that organizes a destructive software application;

As quickly as the Trojan is efficiently injected, it will either cipher the information on the sufferer’s PC or stop the gadget from working in a correct fashion – while also putting a ransom note that states the demand for the sufferers to effect the settlement for the purpose of decrypting the papers or bring back the data system back to the initial condition. In a lot of circumstances, the ransom note will certainly show up when the client reboots the PC after the system has actually currently been damaged.

Win32/Virlock.W circulation channels.

In numerous edges of the globe, Win32/Virlock.W grows by jumps and bounds. However, the ransom money notes and also methods of extorting the ransom money amount might vary relying on particular neighborhood (local) settings. The ransom money notes and also tricks of obtaining the ransom money quantity might differ depending on certain neighborhood (local) settings.

Ransomware injection

For example:

    Faulty notifies about unlicensed software program.

    In particular locations, the Trojans commonly wrongfully report having detected some unlicensed applications enabled on the target’s device. The alert after that requires the individual to pay the ransom.

    Faulty declarations regarding unlawful material.

    In countries where software piracy is much less popular, this method is not as efficient for the cyber fraudulences. Additionally, the Win32/Virlock.W popup alert may falsely claim to be stemming from a police organization and will certainly report having located child porn or various other illegal information on the gadget.

    Win32/Virlock.W popup alert may wrongly declare to be deriving from a law enforcement establishment as well as will report having situated youngster pornography or various other illegal information on the device. The alert will similarly contain a demand for the user to pay the ransom.

Technical details

File Info:

crc32: 127F5315
md5: 2dd577abf8aa2f7a6b651de5a5611494
name: 2DD577ABF8AA2F7A6B651DE5A5611494.mlw
sha1: 944c82de64366b10064de2334a54a17c5ebf8e8f
sha256: 02d9f49b42152b819201cab1ec9232782c08ff333a3fc83e104340682087e330
sha512: 131638a5580fe2e7ef5bb9665a6be76b88d58f6747ab224ad12855c5e7bcb8e36a340ca4281fc30d7eb52e353b4f8715b4419b469ea89e42b1829d1322dc605d
ssdeep: 49152:AMlNGRe9WcsMe5dquLrXJt8Qm0HKhMMpHnOG6:A4WClb2quPZ9HKHHn
type: MS-DOS executable, MZ for MS-DOS

Version Info:

0: [No Data]

Win32/Virlock.W also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 004b6d5e1 )
Elastic malicious (high confidence)
DrWeb Win32.VirLock.16
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.PolyRansom.F3
ALYac Gen:Trojan.Heur.Pnqar9THMeiii
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_80% (D)
K7GW Trojan ( 004b6d5e1 )
Cybereason malicious.bf8aa2
Cyren W32/S-024ada74!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Virlock.W
APEX Malicious
Avast Win32:Malware-gen
ClamAV Win.Virus.Virlock-6840779-0
Kaspersky Virus.Win32.PolyRansom.f
BitDefender Gen:Trojan.Heur.Pnqar9THMeiii
MicroWorld-eScan Gen:Trojan.Heur.Pnqar9THMeiii
Tencent Virus.Win32.VirLocker.j
Ad-Aware Gen:Trojan.Heur.Pnqar9THMeiii
Sophos ML/PE-A + W32/VirRnsm-F
Comodo Virus.Win32.VirLock.GA@7lv9go
F-Secure Trojan.TR/Crypt.XPACK.Gen
BitDefenderTheta AI:Packer.660A59E21D
VIPRE Virus.Win32.Nabucur.c (v)
McAfee-GW-Edition BehavesLike.Win32.Backdoor.tc
FireEye Generic.mg.2dd577abf8aa2f7a
Emsisoft Gen:Trojan.Heur.Pnqar9THMeiii (B)
SentinelOne Static AI – Malicious PE
Avira TR/Crypt.XPACK.Gen
eGambit Unsafe.AI_Score_99%
Antiy-AVL Virus/Win32.Virlock.j
Microsoft Ransom:Win32/Genasom
Arcabit Trojan.Heur.Pnqar9THMeiii
AegisLab Trojan.Win32.Generic.4!c
ZoneAlarm Virus.Win32.PolyRansom.f
GData Gen:Trojan.Heur.Pnqar9THMeiii
McAfee Artemis!2DD577ABF8AA
MAX malware (ai score=85)
VBA32 Trojan.Tiggre
Malwarebytes PolyRansom.Virus.FileInfector.DDS
Panda Trj/Genetic.gen
Rising Virus.VirLock!8.36E (CLOUD)
Yandex Trojan.GenAsa!mkwq23vdyvE
Ikarus Worm.Win32.AutoRun
MaxSecure Virus.polyransom.k
Fortinet W32/Kryptik.BD!tr.ransom
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.PolyRansom.HgIASRAA

How to remove Win32/Virlock.W 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 Win32/Virlock.W 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 Win32/Virlock.W 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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