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

In this short article you will discover regarding the meaning of Trojan-Ransom.Win32.Blocker.kobo and also its adverse impact on your computer. Such ransomware are a type of malware that is elaborated by on-line scams to demand paying the ransom money by a victim.

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Most of the instances, Trojan-Ransom.Win32.Blocker.kobo infection will certainly instruct its victims to launch funds transfer for the function of counteracting the changes that the Trojan infection has actually introduced to the sufferer’s tool.

Trojan-Ransom.Win32.Blocker.kobo 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.
  • Unconventionial language used in binary resources: Russian;
  • 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
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the files situated on the victim’s hard disk drive — so the victim can no more use the data;
  • Preventing regular accessibility to the victim’s workstation;


One of the most normal channels where Trojan-Ransom.Win32.Blocker.kobo Trojans are injected are:

  • By methods of phishing emails;
  • As a repercussion of user ending up on a resource that hosts a harmful software;

As soon as the Trojan is effectively injected, it will either cipher the data on the target’s computer or prevent the tool from working in a proper fashion – while additionally putting a ransom note that mentions the demand for the sufferers to impact the payment for the purpose of decrypting the papers or recovering the data system back to the first problem. In a lot of instances, the ransom money note will come up when the client reboots the COMPUTER after the system has currently been harmed.

Trojan-Ransom.Win32.Blocker.kobo distribution networks.

In different edges of the world, Trojan-Ransom.Win32.Blocker.kobo grows by jumps and bounds. However, the ransom money notes and also tricks of obtaining the ransom money amount may differ depending on specific local (regional) setups. The ransom money notes and also methods of obtaining the ransom quantity might vary depending on certain local (local) settings.

Ransomware injection

For instance:

    Faulty signals concerning unlicensed software program.

    In particular areas, the Trojans commonly wrongfully report having found some unlicensed applications allowed on the victim’s device. The sharp then requires the user to pay the ransom.

    Faulty declarations regarding prohibited content.

    In countries where software piracy is much less preferred, this technique is not as effective for the cyber frauds. Conversely, the Trojan-Ransom.Win32.Blocker.kobo popup alert may wrongly declare to be deriving from a police organization and will report having located child porn or other prohibited data on the tool.

    Trojan-Ransom.Win32.Blocker.kobo popup alert might falsely declare to be deriving from a legislation enforcement establishment as well as will report having located child porn or various other illegal 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: 9D7895E2
md5: d6755bdd9b2178c09102756ca686050b
name: D6755BDD9B2178C09102756CA686050B.mlw
sha1: bc1661639638bc87eb3c4cff2339476843065a17
sha256: 7cdf501c197c75bd57b4e167488f02a38937c73e8f3b4797681736b251bed337
sha512: 3208e6fe9f97e5dc0bb533c9a85350d8425787b3bc13839d07695b7628538b93dfd33d6f37bdd8b8350fc18a9bd0c177f90671b210298bb16d098679fb4d4675
ssdeep: 12288:qcVGYgCR25RNCEofW4eUqfVJKCLwEGPmT4s46wSB3kYGVsmZT:qckTtfB2yUeVJezOcs7w1VZZ
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

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

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Trojan ( 004bdcff1 )
Elastic malicious (high confidence)
DrWeb Trojan.Winlock.7138
Cynet Malicious (score: 90)
ALYac Gen:Trojan.ShellStartup.WGX@aWYiNhdc
Cylance Unsafe
Sangfor Ransom.Win32.LockScreen.AO
CrowdStrike win/malicious_confidence_60% (D)
K7GW Trojan ( 004bdcff1 )
Cybereason malicious.d9b217
ESET-NOD32 a variant of Win32/LockScreen.YL
APEX Malicious
Avast Win32:Trojan-gen
Kaspersky Trojan-Ransom.Win32.Blocker.kobo
BitDefender Gen:Trojan.ShellStartup.WGX@aWYiNhdc
NANO-Antivirus Trojan.Win32.Winlock.bakciu
MicroWorld-eScan Gen:Trojan.ShellStartup.WGX@aWYiNhdc
Tencent Win32.Trojan.Gimemo.ddfp
Ad-Aware Gen:Trojan.ShellStartup.WGX@aWYiNhdc
Sophos Mal/Generic-S
Comodo Malware@#1zrw2stdx8ded
BitDefenderTheta Gen:NN.ZelphiF.34608.WGX@aWYiNhdc
VIPRE Trojan.Win32.Generic!BT
Emsisoft Gen:Trojan.ShellStartup.WGX@aWYiNhdc (B)
Webroot W32.Malware.Gen
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Microsoft Ransom:Win32/LockScreen.AO
Arcabit Trojan.ShellStartup.EDDE01
GData Gen:Trojan.ShellStartup.WGX@aWYiNhdc
AhnLab-V3 Trojan/Win32.Gimemo.C2319217
McAfee Artemis!D6755BDD9B21
MAX malware (ai score=80)
VBA32 TScope.Trojan.Delf
Malwarebytes Malware.Heuristic.1006
Panda Trj/CI.A
Rising Malware.Undefined!8.C (TFE:5:JAxI0TttFNG)
Yandex Trojan.GenAsa!ZlUZFrHjRVM
Ikarus Trojan.Win32.LockScreen
Fortinet W32/LockScreen.YL!tr
AVG Win32:Trojan-gen
Qihoo-360 HEUR/Malware.QVM05.Gen

How to remove Trojan-Ransom.Win32.Blocker.kobo virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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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.Blocker.kobo 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 Trojan-Ransom.Win32.Blocker.kobo 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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