Trojan-Ransom.Win32.Blocker.kwvv

Written by Robert Bailey

What is Trojan-Ransom.Win32.Blocker.kwvv infection?

In this short article you will locate concerning the definition of Trojan-Ransom.Win32.Blocker.kwvv as well as its adverse effect on your computer system. Such ransomware are a type of malware that is elaborated by on-line frauds to demand paying the ransom money by a target.

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In the majority of the situations, Trojan-Ransom.Win32.Blocker.kwvv ransomware will advise its targets to initiate funds transfer for the objective of counteracting the amendments that the Trojan infection has presented to the sufferer’s device.

Trojan-Ransom.Win32.Blocker.kwvv Summary

These modifications can be as follows:

  • 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.
  • A process created a hidden window;
  • Unconventionial language used in binary resources: Bulgarian;
  • 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
  • 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;
  • The sample wrote data to the system hosts file.;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the files situated on the sufferer’s hard disk drive — so the target can no more use the information;
  • Preventing regular access to the sufferer’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.

Trojan-Ransom.Win32.Blocker.kwvv

One of the most typical channels through which Trojan-Ransom.Win32.Blocker.kwvv Trojans are infused are:

  • By means of phishing emails;
  • As an effect of customer winding up on a source that hosts a harmful software;

As soon as the Trojan is effectively injected, it will either cipher the data on the sufferer’s PC or stop the tool from functioning in a correct fashion – while likewise positioning a ransom note that discusses the demand for the targets to impact the repayment for the purpose of decrypting the documents or restoring the data system back to the preliminary problem. In a lot of instances, the ransom note will certainly turn up when the client restarts the COMPUTER after the system has currently been damaged.

Trojan-Ransom.Win32.Blocker.kwvv distribution channels.

In different edges of the globe, Trojan-Ransom.Win32.Blocker.kwvv expands by leaps and bounds. Nevertheless, the ransom notes as well as techniques of extorting the ransom money amount may vary depending on certain neighborhood (regional) setups. The ransom notes as well as tricks of extorting the ransom money amount might vary depending on specific local (local) setups.

Ransomware injection

For example:

    Faulty informs about unlicensed software application.

    In specific areas, the Trojans frequently wrongfully report having found some unlicensed applications made it possible for on the target’s tool. The alert after that requires the individual to pay the ransom.

    Faulty statements regarding prohibited content.

    In nations where software program piracy is less prominent, this technique is not as reliable for the cyber fraudulences. Conversely, the Trojan-Ransom.Win32.Blocker.kwvv popup alert may incorrectly declare to be originating from a police institution and will certainly report having located child pornography or various other prohibited information on the device.

    Trojan-Ransom.Win32.Blocker.kwvv popup alert may wrongly declare to be acquiring from a regulation enforcement organization and also will report having situated child porn or other prohibited data on the gadget. The alert will similarly consist of a requirement for the individual to pay the ransom money.

Technical details

File Info:

crc32: 115A8AC8
md5: 98e83f80f08babd4cce93e8cf395e7a1
name: 98E83F80F08BABD4CCE93E8CF395E7A1.mlw
sha1: e1100cb20ff280f6e721c0e7618d7704fff75765
sha256: 53c20368b7b1096dc82c259203d107db3d4a9fa2022ff8d017305f177809cca0
sha512: 48f471ced798cd6ae249d2c8446451d098a5ed165aa1026292e0a9ab78535647f8598be42858028b1b4fb3ad5822fb72f81891df7966b401008c1047c66a2d80
ssdeep: 6144:lAXiDtNGCRoP/Z3a4+RC0FowUmAPt7JAhGT1AvquWOFRPCr+ZA9wJ2ofmtVl:jDt4nP/Z31ROozPXN1A/6rL9wsrtz
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: (c) Ross-Tech
InternalName: VAG-COM tune up
FileVersion: 2.1.0.0
CompanyName: Ross-Tech
LegalTrademarks: ELKON-BG
ProductName: VAG-COM VCDS
ProductVersion: 2.0.0.0
FileDescription: Stop Update
OriginalFilename: RossRepair
Translation: 0x0409 0x04e4

Trojan-Ransom.Win32.Blocker.kwvv also known as:

GridinSoft Trojan.Ransom.Gen
ALYac Trojan.GenericKD.30459707
Cylance Unsafe
Alibaba Ransom:Win32/Blocker.3a118aad
Cybereason malicious.0f08ba
Symantec ML.Attribute.HighConfidence
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan-Ransom.Win32.Blocker.kwvv
BitDefender Trojan.GenericKD.30459707
NANO-Antivirus Trojan.Win32.Blocker.ezfohs
MicroWorld-eScan Trojan.GenericKD.30459707
Tencent Win32.Trojan.Blocker.Hwwm
Ad-Aware Trojan.GenericKD.30459707
Sophos Generic PUA OB (PUA)
Comodo Malware@#3rt79gou9j0q5
BitDefenderTheta AI:Packer.5A680B9E19
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition BehavesLike.Win32.Dropper.gh
FireEye Trojan.GenericKD.30459707
Emsisoft Trojan.GenericKD.30459707 (B)
Jiangmin Trojan/Genome.ctc
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft Trojan:Win32/Tnega!ml
AegisLab Trojan.Win32.Blocker.j!c
GData Trojan.GenericKD.30459707
TACHYON Ransom/W32.DP-Blocker.442368
McAfee Artemis!98E83F80F08B
MAX malware (ai score=94)
VBA32 BScope.Adware.Presenoker
Panda Trj/GdSda.A
Rising Ransom.Blocker!8.12A (CLOUD)
Ikarus Trojan.Blocker
Fortinet W32/Blocker.KWVV!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Blocker.HgIASQgA

How to remove Trojan-Ransom.Win32.Blocker.kwvv 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 Trojan-Ransom.Win32.Blocker.kwvv 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.Blocker.kwvv 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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