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

What is Worm:MSIL/Necast.H infection?

In this post you will find concerning the meaning of Worm:MSIL/Necast.H and its unfavorable influence on your computer system. Such ransomware are a kind of malware that is specified by on-line fraudulences to demand paying the ransom by a sufferer.

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In the majority of the cases, Worm:MSIL/Necast.H infection will certainly advise its targets to start funds transfer for the function of neutralizing the modifications that the Trojan infection has actually introduced to the target’s gadget.

Worm:MSIL/Necast.H Summary

These adjustments 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.
  • 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.
  • Ciphering the papers located on the sufferer’s disk drive — so the target can no longer make use of the data;
  • Preventing regular accessibility to the sufferer’s workstation;


One of the most regular networks where Worm:MSIL/Necast.H Trojans are infused are:

  • By means of phishing e-mails;
  • As an effect of user ending up on a source that hosts a harmful software;

As soon as the Trojan is effectively injected, it will certainly either cipher the information on the sufferer’s PC or avoid the tool from operating in a correct fashion – while additionally placing a ransom note that discusses the need for the targets to impact the payment for the function of decrypting the records or bring back the documents system back to the preliminary problem. In most circumstances, the ransom note will come up when the customer reboots the COMPUTER after the system has actually currently been harmed.

Worm:MSIL/Necast.H distribution networks.

In different edges of the world, Worm:MSIL/Necast.H grows by jumps and also bounds. However, the ransom money notes and techniques of obtaining the ransom quantity may vary depending on certain regional (regional) setups. The ransom money notes as well as tricks of extorting the ransom money quantity may vary depending on certain local (regional) setups.

Ransomware injection

As an example:

    Faulty informs about unlicensed software application.

    In specific locations, the Trojans often wrongfully report having discovered some unlicensed applications enabled on the target’s device. The sharp after that requires the individual to pay the ransom money.

    Faulty statements regarding prohibited material.

    In countries where software application piracy is much less popular, this method is not as reliable for the cyber frauds. Additionally, the Worm:MSIL/Necast.H popup alert might incorrectly assert to be stemming from a law enforcement institution and will report having located child porn or other unlawful information on the tool.

    Worm:MSIL/Necast.H popup alert might wrongly claim to be obtaining from a regulation enforcement institution and will certainly report having located child porn or other unlawful information on the tool. The alert will likewise contain a need for the individual to pay the ransom.

Technical details

File Info:

crc32: B984FCAB
md5: 917766cc3b99ad121fcd26ea55c05745
name: 917766CC3B99AD121FCD26EA55C05745.mlw
sha1: 22ed90797bc43c15986b9b60955517231e80740d
sha256: f1bb53cba15781e05987d0620fc1b025ff72b5822088304b5b5de0d7d97aaa9e
sha512: 2fcade49d3454185a9320d111b784407dcad8e5fabd7a95b960dd7b3ad4a76b1b8f1774e5f22555efeae3cc23a521ae720798aa80918fc1f862257c478bb8272
ssdeep: 12288:BH8ehRRh/c267iFdtfgTUDpMRx+3dBmSju:jbXn6GF8CMRdSju
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0
LegalCopyright: Copyright xa9 x56fdx5916x6536x96c6x56fdx5bb6x60c5x62a5x63d0x4f9bx603bx4f53x65b9x5411x5e76x8fdbx884cx534fxff0cx60c5x62a5x7684x6536x96c6x6388x6743x7684x60c5x62a5x529b 2017
Assembly Version:
InternalName: W.exe
CompanyName: x7684x6536x96c6x5219x901ax8fc7x6388x6743x7684x60c5x62a5x673ax6784
ProductName: x56fdx5916x6536x96c6x56fdx5bb6x60c5x62a5x63d0x4f9bx603bx4f53x65b9x5411x5e76x8fdbx884cx534fx8c03x5de5x4f5cxff0cx60c5x62a5x7684
FileDescription: x96c6x5219x901ax8fc7x6388x6743x7684x60c5x62a5x673ax6784x7684x4ebax529b
OriginalFilename: W.exe

Worm:MSIL/Necast.H also known as:

Elasticmalicious (high confidence)
K7AntiVirusTrojan ( 004c3af41 )
K7GWTrojan ( 004c3af41 )
ESET-NOD32a variant of MSIL/Kryptik.CDM
RisingRansom.Blocker!8.12A (CLOUD)
CynetMalicious (score: 85)
SentinelOneStatic AI – Malicious PE
CrowdStrikewin/malicious_confidence_90% (D)

How to remove Worm:MSIL/Necast.H 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 Worm:MSIL/Necast.H 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 Worm:MSIL/Necast.H 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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