What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is VirTool:Win32/Obfuscator.JK infection?

In this short article you will discover regarding the interpretation of VirTool:Win32/Obfuscator.JK and also its adverse effect on your computer system. Such ransomware are a kind of malware that is elaborated by on-line fraudulences to require paying the ransom money by a victim.

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In the majority of the cases, VirTool:Win32/Obfuscator.JK virus will advise its targets to initiate funds move for the function of neutralizing the changes that the Trojan infection has introduced to the target’s device.

VirTool:Win32/Obfuscator.JK Summary

These modifications can be as adheres to:

  • 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.
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers found on the target’s hard disk drive — so the victim can no longer make use of the data;
  • Preventing normal 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.


One of the most normal channels through which VirTool:Win32/Obfuscator.JK are infused are:

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

As quickly as the Trojan is effectively injected, it will either cipher the information on the sufferer’s PC or stop the gadget from working in a proper fashion – while also placing a ransom money note that mentions the need for the sufferers to impact the payment for the objective of decrypting the documents or bring back the data system back to the preliminary condition. In the majority of circumstances, the ransom note will come up when the client restarts the PC after the system has actually already been harmed.

VirTool:Win32/Obfuscator.JK distribution channels.

In numerous corners of the globe, VirTool:Win32/Obfuscator.JK expands by leaps and also bounds. Nonetheless, the ransom notes and techniques of extorting the ransom money quantity might vary depending upon particular local (local) settings. The ransom money notes as well as methods of extorting the ransom quantity may differ depending on particular neighborhood (local) settings.

Ransomware injection

For example:

    Faulty notifies concerning unlicensed software.

    In certain locations, the Trojans often wrongfully report having actually detected some unlicensed applications allowed on the victim’s device. The sharp then requires the customer to pay the ransom.

    Faulty declarations regarding prohibited web content.

    In nations where software program piracy is much less preferred, this technique is not as effective for the cyber scams. Additionally, the VirTool:Win32/Obfuscator.JK popup alert might falsely assert to be stemming from a law enforcement organization and will report having situated youngster porn or various other unlawful information on the device.

    VirTool:Win32/Obfuscator.JK popup alert might incorrectly declare to be acquiring from a law enforcement establishment and will report having situated youngster porn or various other illegal information on the tool. The alert will in a similar way include a requirement for the individual to pay the ransom money.

Technical details

File Info:

crc32: A58741A9
md5: b458fbf13ad16ad62ec0fa0b181ca26e
name: B458FBF13AD16AD62EC0FA0B181CA26E.mlw
sha1: 4264cba89db6819637309e89b828fbfdb9a6339d
sha256: 9e4167bc0d1c1646aa7551ec95be861263493260d9d3689e8f5dac35891ef6b2
sha512: 9aadd17800ea09d6f4e55abd78533d6e848ec513ebb2306a578c788c4ffa5238e997a80baaca19bf7253f6b4217edf0d694f669958cbb4e01ad0787075a1f2b0
ssdeep: 3072:BkS45KIH6/mYc8lPIPKdOx3u0pUn97sNfsuV16V6lOhYGB/OtsSPs9CJGykRkB3:Bk6t+YZl7OdFpU9mfFF8B/OtsQKPykG
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

VirTool:Win32/Obfuscator.JK also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 004a6c291 )
Elastic malicious (high confidence)
DrWeb Trojan.Fakealert.20509
Cynet Malicious (score: 100)
CAT-QuickHeal Trojan.FakeAv
ALYac Gen:Trojan.Heur.JP.mmX@a0hdQ1ai
Cylance Unsafe
Zillya Trojan.FakeAV.Win32.247397
Sangfor Backdoor.Win32.VB.epm
CrowdStrike win/malicious_confidence_80% (D)
K7GW Trojan ( 004a6c291 )
Cybereason malicious.13ad16
Symantec ML.Attribute.HighConfidence
ESET-NOD32 Win32/Adware.XPAntiSpyware.AG
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan.Win32.FakeAV.szgo
BitDefender Gen:Trojan.Heur.JP.mmX@a0hdQ1ai
NANO-Antivirus Virus.Win32.Gen-Crypt.ccnc
MicroWorld-eScan Gen:Trojan.Heur.JP.mmX@a0hdQ1ai
Tencent Malware.Win32.Gencirc.11690e7b
Ad-Aware Gen:Trojan.Heur.JP.mmX@a0hdQ1ai
Sophos Mal/Generic-S
Comodo Malware@#31rbotlr6vj48
BitDefenderTheta AI:Packer.D4183D071F
VIPRE Trojan.Win32.Generic!BT
Emsisoft Gen:Trojan.Heur.JP.mmX@a0hdQ1ai (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan/Fakeav.blzq
Avira TR/Crypt.XPACK.Gen
Kingsoft Win32.Heur.KVMH004.a.(kcloud)
Microsoft VirTool:Win32/Obfuscator.JK
Arcabit Trojan.Heur.JP.ED107DE
AegisLab Trojan.Win32.CodecPack.l9lL
GData Gen:Trojan.Heur.JP.mmX@a0hdQ1ai
AhnLab-V3 Trojan/Win32.FakeAV.R63842
McAfee Generic.dx!B458FBF13AD1
MAX malware (ai score=87)
VBA32 Trojan.EA.2951
Panda Trj/CI.A
Rising Backdoor.Win32.VB.epm (CLOUD)
Yandex Adware.XPAntiSpyware!jBRP3YXLTto
Ikarus Trojan.Win32.FakeAV
MaxSecure Trojan.Malware.4983682.susgen
Fortinet W32/FakeAV.PARW!tr
AVG Win32:Malware-gen

How to remove VirTool:Win32/Obfuscator.JK ransomware?

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 VirTool:Win32/Obfuscator.JK 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 VirTool:Win32/Obfuscator.JK you can always ask me in the comments for getting help.

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About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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