Win32/Filecoder.CryptoWall.B

Written by Robert Bailey

What is Win32/Filecoder.CryptoWall.B infection?

In this post you will locate regarding the interpretation of Win32/Filecoder.CryptoWall.B as well as its negative impact on your computer system. Such ransomware are a form of malware that is elaborated by online scams to demand paying the ransom money by a target.

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Most of the instances, Win32/Filecoder.CryptoWall.B virus will advise its sufferers to initiate funds move for the function of neutralizing the amendments that the Trojan infection has actually presented to the sufferer’s device.

Win32/Filecoder.CryptoWall.B Summary

These alterations can be as adheres to:

  • 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.
  • Injection (inter-process);
  • 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.
  • Mimics the system’s user agent string for its own requests;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • Deletes its original binary from disk;
  • Tries to suspend Cuckoo threads to prevent logging of malicious activity;
  • Attempts to delete volume shadow copies;
  • Attempts to stop active services;
  • Modifies boot configuration settings;
  • Behavior consistent with a dropper attempting to download the next stage.;
  • 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 hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Creates a copy of itself;
  • Attempts to disable System Restore. System Restore function – allows you to revert the computer’s state (system files, applications, and system settings) to that of a previous point in time, which can be used to recover after a virus attack.
  • 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 files located on the target’s disk drive — so the target can no more make use of the information;
  • Preventing normal 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.
Similar behavior
Related domains
babyslutsnil.com Ransom.CryptoWall!g3
kaikialexus.com Ransom.CryptoWall!g3
gretableta.com Ransom.CryptoWall!g3
kickasssisters.com Ransom.CryptoWall!g3
clocksoffers.com Ransom.CryptoWall!g3

Win32/Filecoder.CryptoWall.B

The most common channels where Win32/Filecoder.CryptoWall.B are infused are:

  • By means of phishing emails;
  • As a consequence of individual winding up on a resource that holds a harmful software program;

As soon as the Trojan is effectively injected, it will either cipher the information on the victim’s computer or prevent the device from operating in a proper fashion – while likewise putting a ransom money note that points out the requirement for the sufferers to impact the payment for the function of decrypting the documents or restoring the file system back to the first condition. In the majority of instances, the ransom note will show up when the customer restarts the COMPUTER after the system has actually currently been damaged.

Win32/Filecoder.CryptoWall.B distribution channels.

In numerous corners of the globe, Win32/Filecoder.CryptoWall.B expands by jumps as well as bounds. Nonetheless, the ransom notes as well as tricks of extorting the ransom quantity may differ depending on certain local (local) settings. The ransom notes as well as techniques of obtaining the ransom money amount might differ depending on particular neighborhood (local) setups.

Ransomware injection

For example:

    Faulty informs regarding unlicensed software.

    In certain locations, the Trojans frequently wrongfully report having found some unlicensed applications enabled on the target’s device. The alert after that demands the customer to pay the ransom money.

    Faulty statements about prohibited content.

    In nations where software application piracy is less popular, this method is not as effective for the cyber frauds. Additionally, the Win32/Filecoder.CryptoWall.B popup alert might incorrectly declare to be originating from a police organization and will report having located child pornography or other unlawful information on the gadget.

    Win32/Filecoder.CryptoWall.B popup alert may wrongly claim to be deriving from a legislation enforcement institution as well as will certainly report having situated youngster porn or other illegal data on the device. The alert will likewise contain a need for the user to pay the ransom.

Technical details

File Info:

crc32: 7A482F14
md5: a48c852b90b40103801728d77fb2a015
name: A48C852B90B40103801728D77FB2A015.mlw
sha1: 3fe93eae0ef890a3d2ce49a8476cf296acaa95e5
sha256: 5528e1ad72abbfd05cd52053dd70451cc8f7ea4f41a28a010f52ad214bbe40e7
sha512: acbbf618fbd92b21528651158b278bf5956508ab7998baa147310c7f38e537af259694fbd5bf89eb58fdbb2dc49f3bc7a7e9e3aee4674b0a238d3dbfddfcb36f
ssdeep: 3072:7b6m12mXv3kxVusXYvsk8/8v2GBHgV1/NNhooTQ+wAjb6:7b6m1F/KlIL8Ev2imnPTQ+wub6
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: x1f 2004
InternalName: Opyduc
FileVersion: 6, 2, 2
CompanyName: DoctorSoft
LegalTrademarks: Ape Pazire Fysuman Ykama Ytacyqi Ymonox
ProductName: Hede
ProductVersion: 6
FileDescription: Uti Hok Kynamy
OriginalFilename: Vukyd.exe
Translation: 0x0409 0x04b0

Win32/Filecoder.CryptoWall.B also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Trojan ( 0040f8c71 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.514
Cynet Malicious (score: 99)
ALYac Gen:Variant.Razy.677478
Cylance Unsafe
Zillya Trojan.Cryptodef.Win32.37
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_80% (D)
K7GW Trojan ( 0040f8c71 )
Cybereason malicious.b90b40
Baidu Win32.Trojan.Kryptik.ho
Cyren W32/Trojan.JIFE-7605
Symantec Ransom.CryptoWall!g3
ESET-NOD32 Win32/Filecoder.CryptoWall.B
APEX Malicious
Avast Win32:Malware-gen
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Gen:Variant.Razy.677478
NANO-Antivirus Trojan.Win32.Cryptodef.dbjvgd
MicroWorld-eScan Gen:Variant.Razy.677478
Tencent Win32.Trojan.Inject.Auto
Ad-Aware Gen:Variant.Razy.677478
Sophos Mal/Ransom-CV
Comodo Malware@#3au2iwsgro9lf
BitDefenderTheta Gen:NN.ZexaF.34690.my0@auJjZ7di
VIPRE Win32.Malware!Drop
TrendMicro TROJ_CRYPDEF.G
McAfee-GW-Edition BehavesLike.Win32.Ramnit.ch
FireEye Generic.mg.a48c852b90b40103
Emsisoft Gen:Variant.Razy.677478 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.Generic.cbmbd
Webroot W32.Malware.Gen
Avira TR/Crypt.ZPACK.86786
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft Ransom:Win32/Crowti.A
AegisLab Trojan.Win32.Generic.4!c
GData Gen:Variant.Razy.677478
Acronis suspicious
McAfee Ransom-FKV!A48C852B90B4
MAX malware (ai score=84)
VBA32 BScope.Trojan.KillProc
Malwarebytes Spyware.Zbot.VXGen
Panda Generic Malware
TrendMicro-HouseCall TROJ_CRYPDEF.G
Yandex Trojan.Cryptodef!Yo+/cO/esBk
Ikarus Trojan-Ransom.Cryptodef
Fortinet W32/Zbot.AAU!tr
AVG Win32:Malware-gen
Paloalto generic.ml

How to remove Win32/Filecoder.CryptoWall.B 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.CryptoWall.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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Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Win32/Filecoder.CryptoWall.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/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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