What is Virus:Win32/Quervar!B infection?

In this article you will certainly find concerning the interpretation of Virus:Win32/Quervar!B and also its adverse influence on your computer system. Such ransomware are a kind of malware that is elaborated by on-line scams to require paying the ransom money by a sufferer.

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In the majority of the instances, Virus:Win32/Quervar!B infection will certainly advise its targets to launch funds transfer for the function of reducing the effects of the amendments that the Trojan infection has presented to the target’s gadget.

Virus:Win32/Quervar!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.
  • 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.
  • 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.

  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the records found on the target’s hard drive — so the victim can no more utilize the data;
  • 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.


One of the most common networks through which Virus:Win32/Quervar!B Ransomware Trojans are injected are:

  • By methods of phishing emails;
  • As a repercussion of individual winding up on a resource that holds a malicious software application;

As soon as the Trojan is efficiently injected, it will either cipher the information on the target’s computer or prevent the gadget from functioning in a correct way – while additionally placing a ransom money note that states the demand for the victims to impact the settlement for the function of decrypting the papers or recovering the data system back to the preliminary problem. In most circumstances, the ransom money note will certainly show up when the client restarts the COMPUTER after the system has actually already been harmed.

Virus:Win32/Quervar!B distribution networks.

In numerous corners of the world, Virus:Win32/Quervar!B expands by leaps and bounds. However, the ransom money notes as well as methods of extorting the ransom amount might vary depending upon particular neighborhood (local) setups. The ransom money notes as well as tricks of obtaining the ransom amount might vary depending on specific local (local) settings.

Ransomware injection

For example:

    Faulty signals concerning unlicensed software program.

    In certain areas, the Trojans often wrongfully report having actually discovered some unlicensed applications made it possible for on the target’s tool. The sharp after that requires the individual to pay the ransom.

    Faulty declarations regarding illegal material.

    In countries where software program piracy is less popular, this technique is not as reliable for the cyber scams. Additionally, the Virus:Win32/Quervar!B popup alert may falsely declare to be originating from a police institution and also will certainly report having located youngster porn or other illegal information on the device.

    Virus:Win32/Quervar!B popup alert might incorrectly claim to be acquiring from a law enforcement institution and also will report having located youngster porn or various other prohibited data on the device. The alert will likewise contain a demand for the user to pay the ransom money.

Technical details

File Info:

crc32: 998E8B40
md5: a5420b5de69e29f1db2e5dcc1590d6d1
name: A5420B5DE69E29F1DB2E5DCC1590D6D1.mlw
sha1: 475a100d86880ea7234126b5d20993fe83924114
sha256: 732518b864029b74ee03b8f03c2ec61358951bfd8567f5c84ef22df8f103b976
sha512: e07c45482256f0e91ca8f90801cd21c354614accbbc46201b9e34399f303727d3872c63db43f56a12b31e189bca01bbf1caa6c55943b285b016886a22d7ed82e
ssdeep: 6144:kN1MN8XAedYuQZttdYdqAM8x8HUsN2LisKe:kBAoY1n/YAAMjls2s
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Virus:Win32/Quervar!B also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.DocumentOverlayHP.Trojan
K7AntiVirus Riskware ( 0040eff71 )
Elastic malicious (high confidence)
DrWeb Trojan.MulDrop4.30581
Cynet Malicious (score: 100)
ALYac Gen:Variant.Quervar.1
Cylance Unsafe
Zillya Trojan.Dorifel.Win32.5
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_90% (D)
Alibaba Ransom:Win32/Dorifel.66a8e879
K7GW Riskware ( 0040eff71 )
Cybereason malicious.de69e2
Cyren W32/Quervar.A!gen
Symantec Trojan.Exprez.B
ESET-NOD32 a variant of Win32/Kryptik.AMCG
APEX Malicious
Avast Win32:Trojan-gen
Kaspersky Trojan-Ransom.Win32.Dorifel.b
BitDefender Gen:Variant.Quervar.1
NANO-Antivirus Trojan.Win32.Dorifel.bbsrur
MicroWorld-eScan Gen:Variant.Quervar.1
Tencent Malware.Win32.Gencirc.10c4d2c8
Ad-Aware Gen:Variant.Quervar.1
Sophos ML/PE-A + Mal/Palevo-B
Comodo TrojWare.Win32.Lethic.DZA@5s4u8n
BitDefenderTheta Gen:NN.ZexaF.34670.BCZ@a4hxtrci
VIPRE Trojan.Win32.Rimecud.d (v)
Emsisoft Gen:Variant.Quervar.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan/Dorifel.l
Avira TR/Crypt.XPACK.Gen3
eGambit Unsafe.AI_Score_77%
Microsoft Virus:Win32/Quervar.gen!B
Arcabit Trojan.Quervar.1
ZoneAlarm Trojan-Ransom.Win32.Dorifel.b
GData Gen:Variant.Quervar.1
Acronis suspicious
McAfee W32/XDocCrypt.g
MAX malware (ai score=100)
Malwarebytes Malware.Heuristic.1001
Panda Generic Suspicious
TrendMicro-HouseCall PE_QUERVAR.E
Rising Virus.Quervar!8.58D (CLOUD)
Yandex Trojan.GenAsa!/6hMr3jk3q0
Ikarus Trojan-Ransom.Dorifel
Fortinet W32/Generic.AP.D5C64!tr
AVG Win32:Trojan-gen
Qihoo-360 Win32/Worm.Dorifel.HxMBEpsA

How to remove Virus:Win32/Quervar!B ransomware?

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 GridinSoft1

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

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/Quervar!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:

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If the guide doesn’t help you to remove Virus:Win32/Quervar!B you can always ask me in the comments for getting help.

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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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