Win32/Filecoder.CZ

What is Win32/Filecoder.CZ infection?

In this article you will certainly discover about the meaning of Win32/Filecoder.CZ as well as its negative influence on your computer. Such ransomware are a kind of malware that is specified by on the internet frauds to demand paying the ransom by a target.

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In the majority of the instances, Win32/Filecoder.CZ ransomware will certainly advise its victims to initiate funds move for the purpose of counteracting the modifications that the Trojan infection has introduced to the victim’s device.

Win32/Filecoder.CZ Summary

These modifications can be as adheres to:

  • 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.
  • Detected script timer window indicative of sleep style evasion;
  • 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.

  • A scripting utility was executed;
  • Tries to suspend Cuckoo threads to prevent logging of malicious activity;
  • 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;
  • Creates a copy of itself;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the files situated on the victim’s hard drive — so the victim can no longer use the data;
  • Preventing normal accessibility to the victim’s workstation;

Win32/Filecoder.CZ

One of the most normal networks through which Win32/Filecoder.CZ Trojans are injected are:

  • By ways of phishing emails;
  • As a consequence of user winding up on a resource that organizes a malicious software program;

As soon as the Trojan is successfully injected, it will either cipher the data on the sufferer’s PC or prevent the device from working in a proper manner – while also putting a ransom money note that states the need for the victims to impact the payment for the function of decrypting the papers or bring back the documents system back to the first problem. In a lot of circumstances, the ransom note will certainly turn up when the customer reboots the PC after the system has actually currently been damaged.

Win32/Filecoder.CZ distribution networks.

In different edges of the globe, Win32/Filecoder.CZ expands by jumps and also bounds. Nonetheless, the ransom money notes and also methods of extorting the ransom amount may differ depending upon specific regional (regional) settings. The ransom money notes and techniques of obtaining the ransom quantity may differ depending on certain neighborhood (local) setups.

Ransomware injection

As an example:

    Faulty informs concerning unlicensed software program.

    In particular locations, the Trojans usually wrongfully report having identified some unlicensed applications allowed on the sufferer’s device. The sharp then requires the individual to pay the ransom.

    Faulty declarations about illegal web content.

    In countries where software program piracy is much less preferred, this technique is not as efficient for the cyber fraudulences. Conversely, the Win32/Filecoder.CZ popup alert might wrongly assert to be stemming from a law enforcement establishment and also will certainly report having situated kid porn or various other unlawful information on the device.

    Win32/Filecoder.CZ popup alert might incorrectly declare to be obtaining from a legislation enforcement establishment as well as will certainly report having located kid pornography or other unlawful information on the device. The alert will in a similar way include a need for the customer to pay the ransom money.

Technical details

File Info:

crc32: D53489DE
md5: 1f12ea01a5433c6a29bb8823e080390e
name: 1F12EA01A5433C6A29BB8823E080390E.mlw
sha1: 63d463b541719fc903bd8dd3b02abeaa01cde889
sha256: 94bb3f2af1b03554f4eb5f985cad9bd86d854fbb757126acd27ee82744f60739
sha512: e1ef2792f9e0e63b43085c60a5324f2715b1acad37cd49d7ff4f68d96888a98bdf23b985b2ef0b78e1f09df058fd20fa2ce87df26fc58ff43aa544cb83dca5d0
ssdeep: 192:ukamykTdOyUbWFIWp/zPbd+SgTsyR+vtOINr61g0ZhCnLg:3amyykHb2Ic/vd+SgTLAR6rMg
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

InternalName: Audio Subsystem Core
FileDescription: Audio Subsystem Core
FileVersion: 4,1,8,0
ProductVersion: 4.1.8.0
CompanyName: Realteck Software
Translation: 0x0409 0x04b0

Win32/Filecoder.CZ also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 0051656a1 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.124
Cynet Malicious (score: 100)
McAfee Artemis!1F12EA01A543
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
Alibaba Trojan:Win32/runner.ali1000069
K7GW Trojan ( 0051656a1 )
Cybereason malicious.1a5433
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Filecoder.CZ
APEX Malicious
Avast Win32:Trojan-gen
Kaspersky UDS:DangerousObject.Multi.Generic
BitDefender Trojan.Generic.7150892
NANO-Antivirus Trojan.Win32.Encoder.otabh
MicroWorld-eScan Trojan.Generic.7150892
Tencent Win32.Trojan.Raas.Auto
Ad-Aware Trojan.Generic.7150892
Sophos Mal/Generic-S
Comodo Malware@#2hmv150241wuh
BitDefenderTheta Gen:NN.ZelphiF.34628.ay0@a4@9Dzd
VIPRE Trojan.Win32.Generic!BT
TrendMicro TROJ_GEN.R002C0GK320
McAfee-GW-Edition Artemis!Trojan
FireEye Generic.mg.1f12ea01a5433c6a
Emsisoft Trojan.Generic.7150892 (B)
Jiangmin Trojan/Rsaesec.a
Webroot W32.Trojan.Gen
Avira TR/Crypt.XPACK.Gen
Antiy-AVL Trojan/Win32.TSGeneric
Microsoft Trojan:Win32/Dynamer!dtc
Arcabit Trojan.Generic.D6D1D2C
AegisLab Trojan.Win32.Boht.mgO5
ZoneAlarm UDS:DangerousObject.Multi.Generic
GData Trojan.Generic.7150892
AhnLab-V3 Trojan/Win32.Gen
VBA32 Hoax.Rsaesec
MAX malware (ai score=85)
Panda Generic Malware
TrendMicro-HouseCall TROJ_GEN.R002C0GK320
Rising Ransom.FileCryptor!8.1A7 (CLOUD)
SentinelOne Static AI – Suspicious PE
Fortinet W32/Rsaesec.D!tr
AVG Win32:Trojan-gen
Qihoo-360 Win32/Trojan.Generic.HxQBAoIA

How to remove Win32/Filecoder.CZ ransomware?

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.CZ 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.CZ 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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