Troj/Jigsaw-K

Written by Robert Bailey

What is Troj/Jigsaw-K infection?

In this article you will discover about the definition of Troj/Jigsaw-K as well as its adverse impact on your computer system. Such ransomware are a kind of malware that is specified by on the internet fraudulences to demand paying the ransom money by a target.

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Most of the situations, Troj/Jigsaw-K ransomware will certainly instruct its sufferers to initiate funds move for the function of neutralizing the modifications that the Trojan infection has presented to the target’s gadget.

Troj/Jigsaw-K Summary

These alterations can be as complies with:

  • 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.
  • Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • 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;
  • Ciphering the files found on the victim’s hard drive — so the target can no more make use of the information;
  • Preventing regular accessibility to the victim’s workstation;

Troj/Jigsaw-K

The most typical networks where Troj/Jigsaw-K Ransomware are injected are:

  • By means of phishing e-mails;
  • As a repercussion of customer winding up on a source that holds a destructive software program;

As soon as the Trojan is efficiently infused, it will either cipher the data on the target’s PC or avoid the gadget from working in a proper manner – while additionally putting a ransom note that mentions the need for the targets to impact the repayment for the objective of decrypting the documents or restoring the documents system back to the initial condition. In a lot of circumstances, the ransom money note will come up when the customer restarts the PC after the system has actually currently been damaged.

Troj/Jigsaw-K circulation channels.

In numerous edges of the world, Troj/Jigsaw-K expands by leaps as well as bounds. Nonetheless, the ransom money notes and methods of obtaining the ransom money quantity may vary depending upon certain neighborhood (local) settings. The ransom notes and also tricks of extorting the ransom amount might differ depending on particular local (regional) setups.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software.

    In specific areas, the Trojans frequently wrongfully report having found some unlicensed applications allowed on the target’s device. The alert after that requires the user to pay the ransom.

    Faulty statements about illegal web content.

    In nations where software application piracy is less popular, this method is not as effective for the cyber frauds. Alternatively, the Troj/Jigsaw-K popup alert may incorrectly declare to be deriving from a law enforcement organization and also will certainly report having situated youngster pornography or various other unlawful data on the gadget.

    Troj/Jigsaw-K popup alert may wrongly assert to be acquiring from a regulation enforcement organization and also will report having located kid pornography or other prohibited information on the tool. The alert will likewise contain a need for the user to pay the ransom.

Technical details

File Info:

crc32: D2D0F0CB
md5: cc30a0ca73eb20dc73e6ef0a6aa49a9d
name: CC30A0CA73EB20DC73E6EF0A6AA49A9D.mlw
sha1: 33af7367619a95a5a0f9b33d1857ab1907f236ce
sha256: 13b1d649c915ab52d7aacd5c9019269bc3051913e2c635dc55f79e420651b0ed
sha512: 6299cf624f85e0f87cf120cf703da3cd7f131f67a07f4afc29585174d94b8d0566bdbb8d65385d6a8b2032dfda5a332232d20409cee76b3d370b7d5a1b16e4f7
ssdeep: 3072:HVs7Dm4SopIpCVa/vd8A0domujhqhLQR0Gty1mCVa/vd8A0domujhqhLQR0Gty1:1ummta/vyA/TjhAI+a/vyA/TjhAI
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

LegalCopyright: Copyright 1999-2012 Microsoft Corporation. All rights reserved.
Assembly Version: 37.0.2.5583
InternalName: ntoskrnl.exe
FileVersion: 37.0.2.5583
CompanyName: Microsoft Corporation
LegalTrademarks:
Comments: System Core
ProductName: Windows
ProductVersion: 37.0.2.5583
FileDescription: System Core
OriginalFilename: System.exe
Translation: 0x0000 0x04b0

Troj/Jigsaw-K also known as:

GridinSoft Trojan.Ransom.Gen
Elastic malicious (high confidence)
DrWeb Trojan.EncoderNET.2
ALYac Generic.Ransom.Hiddentear.A.B6C3FE10
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_60% (D)
Cybereason malicious.a73eb2
Cyren W32/Filecoder.AQ.gen!Eldorado
Symantec Ransom.Jigsaw
ESET-NOD32 a variant of MSIL/Filecoder.Jigsaw.B
APEX Malicious
Avast Win32:PWSX-gen [Trj]
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Generic.Ransom.Hiddentear.A.B6C3FE10
MicroWorld-eScan Generic.Ransom.Hiddentear.A.B6C3FE10
Ad-Aware Generic.Ransom.Hiddentear.A.B6C3FE10
Sophos Troj/Jigsaw-K
BitDefenderTheta Gen:NN.ZemsilF.34678.mm0@a4j6aUd
TrendMicro Ransom_JIGSAW.SM
McAfee-GW-Edition GenericRXDW-TQ!CC30A0CA73EB
FireEye Generic.mg.cc30a0ca73eb20dc
Emsisoft Malware.Generic.CN1 (A)
SentinelOne Static AI – Malicious PE
eGambit Unsafe.AI_Score_99%
Microsoft Ransom:MSIL/JigsawLocker.A
Arcabit Generic.Ransom.Hiddentear.A.B6C3FE10
GData Generic.Ransom.Hiddentear.A.B6C3FE10
AhnLab-V3 Trojan/Win32.RL_Jigsaw.C3527835
McAfee GenericRXDW-TQ!CC30A0CA73EB
MAX malware (ai score=88)
Malwarebytes Ransom.Jigsaw.Generic
TrendMicro-HouseCall Ransom_JIGSAW.SM
Ikarus Trojan-Ransom.JigSaw
Fortinet MSIL/Jigsaw.B!tr
AVG Win32:PWSX-gen [Trj]

How to remove Troj/Jigsaw-K 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 Troj/Jigsaw-K 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 Troj/Jigsaw-K you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. 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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