Win32/Virlock.AJ

Written by Robert Bailey

What is Win32/Virlock.AJ infection?

In this post you will locate concerning the definition of Win32/Virlock.AJ as well as its negative impact on your computer. Such ransomware are a type of malware that is clarified by on-line 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 | GridinSoft

@topcybersecuritySubscribe to our Telegram channel to be the first to know about news and our exclusive materials on information security.

Most of the situations, Win32/Virlock.AJ virus will certainly advise its victims to start funds transfer for the purpose of reducing the effects of the amendments that the Trojan infection has introduced to the target’s tool.

Win32/Virlock.AJ 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.
  • Expresses interest in specific running processes;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • 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;
  • Checks for the presence of known windows from debuggers and forensic tools;
  • 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 papers found on the sufferer’s disk drive — so the target 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.AJ

One of the most normal channels whereby Win32/Virlock.AJ Ransomware Trojans are infused are:

  • By methods of phishing emails;
  • As a repercussion of user ending up on a source that organizes a destructive software program;

As soon as the Trojan is successfully injected, it will either cipher the information on the sufferer’s PC or avoid the device from working in a correct way – while additionally placing a ransom note that discusses the requirement for the sufferers to effect the repayment for the objective of decrypting the records or recovering the file system back to the first condition. In the majority of instances, the ransom money note will show up when the customer reboots the PC after the system has actually already been harmed.

Win32/Virlock.AJ circulation channels.

In numerous corners of the world, Win32/Virlock.AJ expands by leaps and also bounds. Nevertheless, the ransom money notes and techniques of extorting the ransom money amount may differ relying on particular regional (local) settings. The ransom notes and also tricks of obtaining the ransom money quantity may differ depending on certain local (local) settings.

Ransomware injection

For example:

    Faulty notifies about unlicensed software.

    In particular areas, the Trojans often wrongfully report having detected some unlicensed applications made it possible for on the victim’s gadget. The alert after that requires the user to pay the ransom money.

    Faulty declarations about unlawful content.

    In countries where software program piracy is less popular, this method is not as effective for the cyber scams. Additionally, the Win32/Virlock.AJ popup alert may wrongly declare to be deriving from a police institution and also will report having situated child pornography or other illegal information on the device.

    Win32/Virlock.AJ popup alert might falsely assert to be deriving from a legislation enforcement establishment and also will report having located child pornography or various other unlawful information on the tool. The alert will similarly consist of a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: 32087553
md5: 8c40edadc247e4657016d38c09013b86
name: 8C40EDADC247E4657016D38C09013B86.mlw
sha1: de149cde8016ee4d3c957b5e09d3093fd25a3d55
sha256: f6f048ceb639894c4cda1ec49e17c7d9971c20409efb761a76d1c900b8f70eb9
sha512: 34e0e424a91b0cfb54441ca608108f682e93b8413d673241f38255424c12347ca86a4bbb6200c530dfc45b27a8c2b8d7fdc2e1665579a600d539b5802b809e8d
ssdeep: 24576:/3z1HSRZSeFbWpNKj33BldKMJ/GnNYNH3+yZtJD:/xSRZVYjCBld2qnJ
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Virlock.AJ also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 00573f0e1 )
Elastic malicious (high confidence)
MicroWorld-eScan Gen:Trojan.Heur.GZ.!mW@bWp8bme
ALYac Gen:Trojan.Heur.GZ.!mW@bWp8bme
Malwarebytes Trojan.VirLock
CrowdStrike win/malicious_confidence_100% (W)
BitDefender Gen:Trojan.Heur.GZ.!mW@bWp8bme
K7GW Trojan ( 00573f0e1 )
Cybereason malicious.dc247e
BitDefenderTheta AI:Packer.EF5F73201E
Cyren W32/Virlock.N2.gen!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Virlock.AJ
APEX Malicious
Paloalto generic.ml
Cynet Malicious (score: 100)
Kaspersky Virus.Win32.PolyRansom.b
Alibaba Virus:Win32/PolyRansom.225d1586
NANO-Antivirus Trojan.Win32.Gena.doticp
Ad-Aware Gen:Trojan.Heur.GZ.!mW@bWp8bme
Comodo TrojWare.Win32.Virlock.XU@5xaovq
DrWeb Trojan.Packed
TrendMicro TROJ_GEN.R03BC0DB321
McAfee-GW-Edition BehavesLike.Win32.VirRansom.fc
FireEye Generic.mg.8c40edadc247e465
Sophos Mal/Generic-R + W32/VirRnsm-N
Avira TR/Crypt.XPACK.Gen
Arcabit Trojan.Heur.GZ.EC67F7
SUPERAntiSpyware Ransom.Virlock/Variant
ZoneAlarm Virus.Win32.PolyRansom.b
GData Gen:Trojan.Heur.GZ.!mW@bWp8bme
TACHYON Virus/W32.VirRansom
AhnLab-V3 Malware/Win32.Nabucur.R358861
Acronis suspicious
MAX malware (ai score=87)
TrendMicro-HouseCall TROJ_GEN.R03BC0DB321
Tencent Win32.Virus.Polyransom.Ebqm
SentinelOne Static AI – Malicious PE
eGambit Unsafe.AI_Score_99%
Fortinet W32/Virlock.B
Panda Trj/Genetic.gen
Qihoo-360 Win32/Ransom.PolyRansom.HxQBIWcA

How to remove Win32/Virlock.AJ 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.AJ 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 Win32/Virlock.AJ you can always ask me in the comments for getting help.

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

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.

Leave a Reply

Sending

This site uses Akismet to reduce spam. Learn how your comment data is processed.