Win32/Virlock.D

What is Win32/Virlock.D infection?

In this post you will locate concerning the definition of Win32/Virlock.D and also its negative effect on your computer. Such ransomware are a form of malware that is specified by on-line frauds to require paying the ransom money by a sufferer.

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Most of the cases, Win32/Virlock.D virus will certainly instruct its sufferers to initiate funds move for the objective of counteracting the changes that the Trojan infection has introduced to the sufferer’s tool.

Win32/Virlock.D 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.
  • 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.
  • Detected script timer window indicative of sleep style evasion;
  • Expresses interest in specific running processes;
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • 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.
  • A scripting utility was executed;
  • 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;
  • 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 documents located on the sufferer’s hard drive — so the victim can no longer utilize 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.

Win32/Virlock.D

The most normal networks where Win32/Virlock.D Ransomware are injected are:

  • By ways of phishing emails;
  • As a repercussion of user ending up on a source that organizes a harmful software;

As quickly as the Trojan is efficiently injected, it will certainly either cipher the information on the victim’s computer or stop the tool from working in a proper fashion – while likewise putting a ransom note that mentions the demand for the victims to effect the settlement for the objective of decrypting the records or bring back the file system back to the initial problem. In the majority of circumstances, the ransom money note will certainly come up when the client restarts the PC after the system has already been damaged.

Win32/Virlock.D circulation networks.

In numerous edges of the world, Win32/Virlock.D expands by jumps as well as bounds. However, the ransom money notes as well as tricks of extorting the ransom amount may vary depending on specific neighborhood (regional) setups. The ransom notes as well as tricks of obtaining the ransom money quantity might differ depending on certain neighborhood (local) settings.

Ransomware injection

As an example:

    Faulty signals about unlicensed software.

    In particular locations, the Trojans frequently wrongfully report having actually identified some unlicensed applications allowed on the target’s gadget. The sharp then demands the user to pay the ransom.

    Faulty declarations about unlawful web content.

    In nations where software application piracy is less preferred, this method is not as effective for the cyber fraudulences. Conversely, the Win32/Virlock.D popup alert might incorrectly assert to be originating from a police establishment and will report having located child pornography or other prohibited information on the gadget.

    Win32/Virlock.D popup alert may incorrectly assert to be acquiring from a legislation enforcement institution as well as will certainly report having located child pornography or other prohibited data on the device. The alert will in a similar way include a need for the customer to pay the ransom money.

Technical details

File Info:

crc32: 3A828AEE
md5: 31b879f1a1da4dec9e94e587ffe578ac
name: 31B879F1A1DA4DEC9E94E587FFE578AC.mlw
sha1: 5a6f54ecdad8b70de604da8dbf468762adf36cb7
sha256: 912f5e8a21a87b92fa602969895dbc072dd7b5d3e1230cd854b8ed886f2d5a6f
sha512: 2176599b0fb2015e377f4bebc1b3c8e6154ad76fbed5da74dd04d18d610b01909d5758f84d96be5b45bf9e404b15bb1004b42a2f2778de1ae8c95360e4027ede
ssdeep: 6144:67tjhCMPh41mbSXaVvjFyaMcEK1mLoqte7RkVENIaqoSh8plhhJM5RkbZtDyE:6BjhCuIqVxvN1mLxwRiENIanShsY5Rk
type: MS-DOS executable, MZ for MS-DOS

Version Info:

0: [No Data]

Win32/Virlock.D also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 0052964f1 )
Elastic malicious (high confidence)
DrWeb Win32.VirLock.10
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.PolyRansom.B3
ALYac Gen:Variant.Strictor.147778
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_90% (D)
K7GW Trojan ( 0052964f1 )
Cybereason malicious.1a1da4
Cyren W32/S-98bdd651!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Virlock.D
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Virus.Win32.PolyRansom.b
BitDefender Gen:Variant.Strictor.147778
NANO-Antivirus Virus.Win32.PolyRansom.esxyiq
MicroWorld-eScan Gen:Variant.Strictor.147778
Tencent Virus.Win32.Polyransom.b
Ad-Aware Gen:Variant.Strictor.147778
Sophos ML/PE-A + W32/VirRnsm-C
Comodo Malware@#2hgua6yz7uwo8
BitDefenderTheta Gen:NN.ZexaF.34670.xmqaaqWJCkfi
VIPRE Trojan.Win32.Generic.pak!cobra
McAfee-GW-Edition BehavesLike.Win32.Backdoor.fc
FireEye Generic.mg.31b879f1a1da4dec
Emsisoft Gen:Variant.Strictor.147778 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Win32/Polyransom.b
Avira TR/Crypt.XPACK.Gen
Microsoft Virus:Win32/Nabucur.A
Arcabit Trojan.Strictor.D24142
AegisLab Virus.Win32.PolyRansom.n!c
GData Gen:Variant.Strictor.147778
Acronis suspicious
McAfee Artemis!31B879F1A1DA
MAX malware (ai score=85)
VBA32 Trojan.Tiggre
Malwarebytes PolyRansom.Virus.FileInfector.DDS
Panda Generic Suspicious
Rising Trojan.Win32.PolyRansom.a (CLOUD)
Ikarus Worm.Win32.Vercuser
MaxSecure Virus.PolyRansom.B1
Fortinet W32/Virlock.D
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.PolyRansom.HxIBEpsA

How to remove Win32/Virlock.D 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.D 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.D 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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