Win32/Filecoder.NFJ

Written by Robert Bailey

What is Win32/Filecoder.NFJ infection?

In this article you will find about the meaning of Win32/Filecoder.NFJ and also its adverse influence on your computer system. Such ransomware are a kind of malware that is clarified by online frauds to demand paying the ransom money by a target.

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In the majority of the instances, Win32/Filecoder.NFJ infection will advise its victims to start funds transfer for the objective of counteracting the modifications that the Trojan infection has introduced to the target’s device.

Win32/Filecoder.NFJ Summary

These alterations can be as complies with:

  • Injection (inter-process);
  • Injection (Process Hollowing);
  • 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.
  • Compression (or decompression);
  • Injection with CreateRemoteThread in a remote process;
  • 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.
  • A process attempted to delay the analysis task.;
  • A process created a hidden window;
  • 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.
  • Executed a process and injected code into it, probably while unpacking;
  • Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
  • 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;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the papers found on the sufferer’s disk drive — so the victim can no longer make use of the data;
  • 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.

Win32/Filecoder.NFJ

The most regular channels through which Win32/Filecoder.NFJ Ransomware are injected are:

  • By ways of phishing emails;
  • As a consequence of customer winding up on a source that organizes a harmful software;

As quickly as the Trojan is effectively infused, it will certainly either cipher the data on the target’s computer or prevent the device from operating in a correct manner – while also placing a ransom money note that mentions the need for the targets to effect the settlement for the purpose of decrypting the documents or restoring the documents system back to the initial problem. In the majority of instances, the ransom money note will certainly show up when the customer restarts the COMPUTER after the system has actually already been harmed.

Win32/Filecoder.NFJ circulation channels.

In numerous corners of the world, Win32/Filecoder.NFJ expands by leaps and bounds. Nonetheless, the ransom money notes and also methods of obtaining the ransom quantity might vary relying on particular regional (regional) settings. The ransom notes and also techniques of extorting the ransom quantity might vary depending on particular regional (local) setups.

Ransomware injection

As an example:

    Faulty informs concerning unlicensed software application.

    In specific locations, the Trojans frequently wrongfully report having actually found some unlicensed applications enabled on the target’s gadget. The sharp then requires the customer to pay the ransom.

    Faulty statements about unlawful content.

    In nations where software piracy is much less popular, this method is not as effective for the cyber scams. Alternatively, the Win32/Filecoder.NFJ popup alert might incorrectly claim to be originating from a police institution and will report having situated kid porn or various other illegal data on the device.

    Win32/Filecoder.NFJ popup alert may incorrectly claim to be deriving from a regulation enforcement institution and also will certainly report having situated youngster pornography or various other prohibited data on the tool. The alert will in a similar way have a demand for the user to pay the ransom money.

Technical details

File Info:

crc32: D4184836
md5: 654e487c0d53049e63da1b5a094b94ed
name: 654E487C0D53049E63DA1B5A094B94ED.mlw
sha1: 14b8e371f5f8261edafa77fb94e391c58da9fdaf
sha256: 1aba4416d433618ac1d3378e960593220c96b8e84d56bd5f639885db50f4ed67
sha512: 5c6ce7a7f7ea8e46395255665a54781c5955e6615ddbe82e9318c31fdcc5d3491e6fb9191a3c72e0c9341b1e62c9027d1be62141022295a4c3b2259f54c0c232
ssdeep: 3072:wZ+1iI3XWmrC7fAxTr+G+27HmIfqFirETgqDXwNzIrfe6KiUALT6z9wqMgo1k:wSn6IgGvHm31Dgem6KiUAH6z9wqOk
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Filecoder.NFJ also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 0055e3ef1 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.3689
Cynet Malicious (score: 100)
CAT-QuickHeal Trojan.Ursnif.100315
ALYac Trojan.Ransom.cryptolocker
Cylance Unsafe
Zillya Trojan.Filecoder.Win32.1880
Sangfor Ransom.Win32.WinPlock.A
CrowdStrike win/malicious_confidence_100% (D)
Alibaba Ransom:Win32/Snocry.e76680e1
K7GW Trojan ( 0055e3ef1 )
Cybereason malicious.c0d530
Cyren W32/Trojan.RVGU-3177
Symantec Ransom.Cryptolocker
ESET-NOD32 Win32/Filecoder.NFJ
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan-Ransom.Win32.Snocry.dmd
BitDefender Gen:Variant.Barys.62425
NANO-Antivirus Trojan.Win32.Encoder.eaaxms
MicroWorld-eScan Gen:Variant.Barys.62425
Tencent Malware.Win32.Gencirc.114c3bee
Ad-Aware Gen:Variant.Barys.62425
Sophos Mal/Generic-S
Comodo Malware@#3kwrfduy3ebdr
BitDefenderTheta Gen:NN.ZexaF.34678.qyX@ayzWEkk
VIPRE Trojan.Win32.Generic.pak!cobra
TrendMicro TROJ_HPROVNIX.SM
McAfee-GW-Edition BehavesLike.Win32.Generic.dh
FireEye Generic.mg.654e487c0d53049e
Emsisoft Gen:Variant.Barys.62425 (B)
SentinelOne Static AI – Malicious PE
Avira HEUR/AGEN.1102653
eGambit Unsafe.AI_Score_99%
Kingsoft Win32.Heur.KVMH008.a.(kcloud)
Microsoft Ransom:Win32/WinPlock.A
AegisLab Trojan.Win32.Cryptolocker.tqE2
GData Gen:Variant.Barys.62425
AhnLab-V3 Trojan/Win32.CryptoWall.R173903
Acronis suspicious
McAfee Generic.cjg
MAX malware (ai score=100)
VBA32 BScope.TrojanRansom.Snocry
Panda Trj/GdSda.A
TrendMicro-HouseCall TROJ_HPROVNIX.SM
Rising Ransom.Snocry!8.320 (CLOUD)
Yandex Trojan.GenAsa!UATCr07Sce4
Ikarus Trojan.Win32.Filecoder
Fortinet W32/HPROVNIX.SM!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Generic.HxMB4TcA

How to remove Win32/Filecoder.NFJ virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

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 Win32/Filecoder.NFJ 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 Win32/Filecoder.NFJ 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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