MSIL/Filecoder.Jigsaw.B

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

What is MSIL/Filecoder.Jigsaw.B infection?

In this article you will find regarding the interpretation of MSIL/Filecoder.Jigsaw.B as well as its unfavorable influence on your computer system. Such ransomware are a form of malware that is specified by online frauds to demand paying the ransom by a target.

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Most of the instances, MSIL/Filecoder.Jigsaw.B virus will advise its targets to start funds transfer for the objective of neutralizing the modifications that the Trojan infection has actually introduced to the sufferer’s tool.

MSIL/Filecoder.Jigsaw.B Summary

These alterations can be as follows:

  • 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.
  • 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
  • Exhibits possible ransomware file modification behavior;
  • Writes a potential ransom message to disk;
  • Creates a copy of itself;
  • Ciphering the records found on the target’s disk drive — so the victim can no more utilize the information;
  • Preventing routine accessibility to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.

MSIL/Filecoder.Jigsaw.B

One of the most typical channels where MSIL/Filecoder.Jigsaw.B Ransomware are infused are:

  • By ways of phishing e-mails;
  • As a consequence of user ending up on a source that hosts a malicious software application;

As soon as the Trojan is successfully injected, it will either cipher the information on the victim’s PC or stop the gadget from working in a correct way – while likewise putting a ransom note that discusses the demand for the targets to impact the repayment for the purpose of decrypting the documents or restoring the documents system back to the first condition. In many circumstances, the ransom note will certainly turn up when the customer reboots the COMPUTER after the system has actually currently been damaged.

MSIL/Filecoder.Jigsaw.B circulation channels.

In numerous corners of the world, MSIL/Filecoder.Jigsaw.B grows by leaps and bounds. However, the ransom money notes as well as methods of obtaining the ransom money quantity might vary depending on particular regional (local) setups. The ransom notes and also techniques of extorting the ransom quantity may differ depending on particular local (regional) setups.

Ransomware injection

For example:

    Faulty alerts regarding unlicensed software.

    In particular areas, the Trojans often wrongfully report having spotted some unlicensed applications made it possible for on the victim’s device. The sharp after that requires the individual to pay the ransom.

    Faulty declarations regarding prohibited content.

    In countries where software program piracy is much less prominent, this technique is not as efficient for the cyber frauds. Conversely, the MSIL/Filecoder.Jigsaw.B popup alert may falsely declare to be originating from a law enforcement institution as well as will report having located child porn or other prohibited information on the gadget.

    MSIL/Filecoder.Jigsaw.B popup alert might wrongly assert to be deriving from a law enforcement institution and also will report having located child porn or various other illegal information on the tool. The alert will in a similar way contain a need for the individual to pay the ransom money.

Technical details

File Info:

crc32: ACEDBCB4
md5: 68d07c3d4ce9af16e26905764ef42ce9
name: 68D07C3D4CE9AF16E26905764EF42CE9.mlw
sha1: d9245df6a5e375f6072fa64812f11cbba6177b70
sha256: 7b9f60becb5d50b1f4279c99f9292e63dcb961f5e35bd4e78129432f43b5f368
sha512: 0db8e2f9750dca1850b6913111d96db7f755ef2df7b8e3e75c7781f72596fcd3c01c16c8943d61a355951637f6efe02a9234d68eac908f4b243b2203f219ef4b
ssdeep: 6144:ZS0YNvRLUClK2oKaOsZMm3iH+UmNUwpNXMZVxYgzt:Q0SAClVsMQiHrBwpGXx
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0
LegalCopyright: Bitcoin Private Generator Activated V2.4
Assembly Version: 37.0.2.5583
InternalName: Bitcoin Private Generator Activated V2.4.exe
FileVersion: 2.4
CompanyName: Bitcoin Private Generator Activated V2.4
LegalTrademarks: Bitcoin Private Generator Activated V2.4
Comments: Bitcoin Private Generator Activated V2.4
ProductName: Bitcoin Private Generator Activated V2.4
ProductVersion: 2.4
FileDescription: Bitcoin Private Generator Activated V2.4
OriginalFilename: Bitcoin Private Generator Activated V2.4.exe

MSIL/Filecoder.Jigsaw.B also known as:

GridinSoftTrojan.Ransom.Gen
K7AntiVirusTrojan ( 700000121 )
Elasticmalicious (high confidence)
DrWebTrojan.MulDrop8.34821
CynetMalicious (score: 85)
ALYacTrojan.Ransom.Jigsaw
CylanceUnsafe
ZillyaTrojan.Filecoder.Win32.8062
SangforTrojan.Win32.Save.a
CrowdStrikewin/malicious_confidence_60% (D)
AlibabaRansom:MSIL/JigsawLocker.0e7f4c80
K7GWTrojan ( 700000121 )
Cybereasonmalicious.d4ce9a
CyrenW32/Filecoder.AQ.gen!Eldorado
SymantecRansom.Jigsaw
ESET-NOD32a variant of MSIL/Filecoder.Jigsaw.B
APEXMalicious
AvastMSIL:JigSaw-A [Trj]
KasperskyHEUR:Trojan.Win32.Generic
BitDefenderGeneric.Ransom.Hiddentear.A.B84EACA0
NANO-AntivirusTrojan.Win32.Filecoder.fgpefj
MicroWorld-eScanGeneric.Ransom.Hiddentear.A.B84EACA0
TencentWin32.Trojan.Raas.Auto
Ad-AwareGeneric.Ransom.Hiddentear.A.B84EACA0
SophosTroj/Jigsaw-K
ComodoMalware@#3qynyjszijhqw
BitDefenderThetaGen:NN.ZemsilF.34608.sm0@aCGUxD
VIPRETrojan.Win32.Generic!BT
TrendMicroRansom.MSIL.JIGSAW.SM
McAfee-GW-EditionGenericRXDW-TQ!68D07C3D4CE9
FireEyeGeneric.Ransom.Hiddentear.A.B84EACA0
EmsisoftGeneric.Ransom.Hiddentear.A.B84EACA0 (B)
SentinelOneStatic AI – Malicious PE
AviraHEUR/AGEN.1126343
MicrosoftRansom:MSIL/JigsawLocker.A
AegisLabTrojan.Win32.Generic.4!c
GDataGeneric.Ransom.Hiddentear.A.B84EACA0
AhnLab-V3Win-Trojan/JigsawLocker.Gen
McAfeeGenericRXDW-TQ!68D07C3D4CE9
MAXmalware (ai score=100)
MalwarebytesRansom.Jigsaw.Generic
PandaTrj/GdSda.A
TrendMicro-HouseCallRansom.MSIL.JIGSAW.SM
RisingRansom.JigsawLocker!8.52DD (CLOUD)
YandexTrojan.Agent!7KGidhGGeTw
IkarusTrojan-Ransom.JigSaw
FortinetMSIL/Jigsaw.B!tr
AVGMSIL:JigSaw-A [Trj]
Paloaltogeneric.ml
Qihoo-360Win32/Trojan.ac2

How to remove MSIL/Filecoder.Jigsaw.B 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 MSIL/Filecoder.Jigsaw.B 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 MSIL/Filecoder.Jigsaw.B 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/comparison

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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