Written by Robert Bailey

What is Trojan-Ransom.Win32.Crypren.qfw infection?

In this article you will locate concerning the interpretation of Trojan-Ransom.Win32.Crypren.qfw and also its adverse effect on your computer. Such ransomware are a type of malware that is clarified by on-line scams to demand paying the ransom by a sufferer.

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Most of the situations, Trojan-Ransom.Win32.Crypren.qfw ransomware will advise its targets to initiate funds transfer for the objective of reducing the effects of the changes that the Trojan infection has actually presented to the victim’s gadget.

Trojan-Ransom.Win32.Crypren.qfw Summary

These alterations can be as follows:

  • Injection (inter-process);
  • Injection (Process Hollowing);
  • 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.

  • A process created a hidden window;
  • Unconventionial language used in binary resources: Czech;
  • Executed a process and injected code into it, probably while unpacking;
  • Attempts to delete volume shadow copies;
  • 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!
  • A system process is generating network traffic likely as a result of process injection;
  • 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 copy of itself;
  • Harvests information related to installed mail clients;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the records situated on the victim’s hard drive — so the target can no longer utilize the data;
  • Preventing routine 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.


The most normal channels whereby Trojan-Ransom.Win32.Crypren.qfw Ransomware are infused are:

  • By means of phishing emails;
  • As an effect of user winding up on a resource that holds a destructive software;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the information on the victim’s computer or protect against the tool from operating in a proper way – while likewise positioning a ransom note that mentions the need for the sufferers to effect the payment for the function of decrypting the papers or bring back the file system back to the first problem. In many circumstances, the ransom money note will come up when the customer restarts the COMPUTER after the system has already been damaged.

Trojan-Ransom.Win32.Crypren.qfw distribution networks.

In numerous corners of the globe, Trojan-Ransom.Win32.Crypren.qfw expands by leaps as well as bounds. However, the ransom money notes and methods of obtaining the ransom amount may differ depending upon particular neighborhood (local) setups. The ransom money notes and also techniques of extorting the ransom money quantity might vary depending on certain local (local) settings.

Ransomware injection

As an example:

    Faulty alerts regarding unlicensed software.

    In certain areas, the Trojans commonly wrongfully report having actually spotted some unlicensed applications enabled on the target’s gadget. The sharp after that requires the user to pay the ransom.

    Faulty statements about prohibited material.

    In countries where software application piracy is less popular, this technique is not as effective for the cyber scams. Additionally, the Trojan-Ransom.Win32.Crypren.qfw popup alert may incorrectly claim to be originating from a police organization as well as will report having located kid porn or various other prohibited information on the gadget.

    Trojan-Ransom.Win32.Crypren.qfw popup alert may falsely declare to be deriving from a law enforcement institution and also will certainly report having located kid porn or other illegal information on the gadget. The alert will likewise include a requirement for the user to pay the ransom money.

Technical details

File Info:

crc32: 88C69F15
md5: 8b638a770dda18903114ebe39badcd98
name: 8B638A770DDA18903114EBE39BADCD98.mlw
sha1: 30f45f51316e8529148c3d80656da026b8306485
sha256: 222fd3efb402cd02bd7e63295e7f9f63e351b2329b040f2f20e505ea6e9c7bad
sha512: e0a7a25ce7fddeba6ed07f09c5b13c5a78b6c483d775e0e4237b469a6e4c9e0c653364178637dbaa63942b95c11b22ee253b8d86fb2fcef33a7a9e62c2eac0b9
ssdeep: 6144:pi4LrqCFyLEYK2P1VanQ2caCjJXF/j/IMGK/EeD71wlTZF5558cF0I:pLvvIL1CCFXF/P7j7aTDDqcFX
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: (C) 2012 NVIDIA Corporation. All rights reserved.
InternalName: nvStWiz.exe
CompanyName: NVIDIA Corporation
ProductName: GeForce 3D Vision Wizard
FileDescription: GeForce 3D Vision Wizard
OriginalFilename: nvStWiz.exe
Translation: 0x0409 0x04b0

Trojan-Ransom.Win32.Crypren.qfw also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.Common.52A58C94
K7AntiVirus Trojan ( 004aa0281 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.761
Cynet Malicious (score: 100)
CAT-QuickHeal Worm.Gamarue.WR5
ALYac Trojan.GenericKD.1997121
Cylance Unsafe
Zillya Trojan.Crypren.Win32.114
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Ransom:Win32/Crypren.c64b1ea2
K7GW Trojan ( 004aa0281 )
Cybereason malicious.70dda1
Cyren W32/Trojan.ZQYP-2392
Symantec Ransom.Cryptolock!g8
ESET-NOD32 Win32/Filecoder.TorrentLocker.A
Zoner Trojan.Win32.27456
APEX Malicious
TotalDefense Win32/Ransom.VXHNMEC
Avast Win32:Malware-gen
ClamAV Win.Trojan.Cryptolocker-5
Kaspersky Trojan-Ransom.Win32.Crypren.qfw
BitDefender Trojan.GenericKD.1997121
NANO-Antivirus Trojan.Win32.Encoder.efhesy
ViRobot Trojan.Win32.Ransom.483840
MicroWorld-eScan Trojan.GenericKD.1997121
Tencent Malware.Win32.Gencirc.114ca2d9
Ad-Aware Trojan.GenericKD.1997121
Sophos Mal/Generic-S + Mal/Generic-L
Comodo Malware@#1ma27qeepg4wb
BitDefenderTheta Gen:NN.ZexaF.34628.Cq0@aiE6!giO
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition Generic.vd
Emsisoft Trojan.GenericKD.1997121 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan/
Webroot Trojan.Dropper.Gen
Avira TR/Dorkbot.33118900
eGambit Unsafe.AI_Score_99%
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft Ransom:Win32/Teerac.A
Arcabit Trojan.Generic.D1E7941
AegisLab Trojan.Win32.Crypren.j!c
GData Win32.Trojan.Agent.QN9HIK
TACHYON Trojan/W32.Crypren.473600
AhnLab-V3 Trojan/Win32.Agent.C670704
Acronis suspicious
McAfee Generic.vd
MAX malware (ai score=100)
VBA32 Hoax.Crypren
Panda Trj/Chgt.M
TrendMicro-HouseCall TROJ_FORUCON.BME
Rising Trojan.Win32.Teerac.ah (CLOUD)
Ikarus Trojan-Ransom.Crypren
Fortinet W32/Injector.MMTJ!tr
AVG Win32:Malware-gen
Qihoo-360 Win32/Ransom.TorrentLocker.HwoCEpsA

How to remove Trojan-Ransom.Win32.Crypren.qfw 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 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 Trojan-Ransom.Win32.Crypren.qfw 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 Trojan-Ransom.Win32.Crypren.qfw you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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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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