Win32/Kryptik.FWNZ

Written by Robert Bailey

What is Win32/Kryptik.FWNZ infection?

In this post you will certainly locate regarding the definition of Win32/Kryptik.FWNZ as well as its negative impact on your computer. Such ransomware are a type of malware that is specified by on the internet frauds to demand paying the ransom by a sufferer.

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Most of the instances, Win32/Kryptik.FWNZ ransomware will certainly instruct its targets to start funds transfer for the function of neutralizing the amendments that the Trojan infection has actually presented to the target’s tool.

Win32/Kryptik.FWNZ Summary

These modifications 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.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Attempts to connect to a dead IP:Port (3 unique times);
  • 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.
  • Possible date expiration check, exits too soon after checking local time;
  • 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 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.
  • 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;
  • Enumerates services, possibly for anti-virtualization;
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • 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
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents situated on the sufferer’s hard disk — so the sufferer can no more use 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.
Similar behavior
Related domains
microsoft-com.mail.protection.outlook.com Ransom.Exxroute.A4

Win32/Kryptik.FWNZ

One of the most normal networks through which Win32/Kryptik.FWNZ are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a repercussion of customer winding up on a resource that holds a destructive software program;

As soon as the Trojan is successfully infused, it will either cipher the data on the target’s PC or prevent the device from functioning in an appropriate manner – while also putting a ransom money note that mentions the requirement for the targets to impact the payment for the objective of decrypting the papers or bring back the data system back to the preliminary problem. In the majority of circumstances, the ransom note will turn up when the client restarts the PC after the system has currently been harmed.

Win32/Kryptik.FWNZ circulation channels.

In various edges of the globe, Win32/Kryptik.FWNZ expands by jumps and also bounds. Nevertheless, the ransom money notes and methods of extorting the ransom quantity might vary relying on specific neighborhood (regional) settings. The ransom money notes as well as methods of obtaining the ransom quantity might differ depending on certain local (local) settings.

Ransomware injection

For example:

    Faulty alerts regarding unlicensed software application.

    In specific locations, the Trojans usually wrongfully report having actually discovered some unlicensed applications enabled on the sufferer’s device. The alert after that requires the customer to pay the ransom money.

    Faulty declarations regarding unlawful web content.

    In countries where software piracy is much less prominent, this method is not as effective for the cyber fraudulences. Alternatively, the Win32/Kryptik.FWNZ popup alert might falsely claim to be deriving from a police organization and also will certainly report having situated kid porn or various other prohibited data on the gadget.

    Win32/Kryptik.FWNZ popup alert might falsely assert to be obtaining from a legislation enforcement establishment and also will certainly report having located kid porn or other prohibited data on the device. The alert will similarly include a need for the customer to pay the ransom.

Technical details

File Info:

crc32: B3FAB0AE
md5: 91ca39ab30e92764be4d1a9058a33fe1
name: upload_file
sha1: 55f7df30c6fabc1402e93722373b6434f4f597da
sha256: 6338b7cbf215caa58ffe9f8fad281080baeb36c2bdce30465430246bd6ed232f
sha512: e0f939e90592bca77598aa495fcc2670433f21bf50d2cdeb13b3adc8b8668faa32f53205a7109b75967cd2b7c339bc6932f41206d5c1ddd1dfed7ec327f4ceb4
ssdeep: 196608:qE3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3E3:qE3E3E3E3E3E3E3E3E3E3E3E3E3E3E3
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Kryptik.FWNZ also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Trojan.GenericKDZ.40409
FireEye Generic.mg.91ca39ab30e92764
CAT-QuickHeal Ransom.Exxroute.A4
McAfee Ransomware-GFC!91CA39AB30E9
Cylance Unsafe
AegisLab Trojan.Win32.Tofsee.m!c
Sangfor Malware
K7AntiVirus Trojan ( 0051918c1 )
BitDefender Trojan.GenericKDZ.40409
K7GW Trojan ( 0051918c1 )
CrowdStrike win/malicious_confidence_100% (W)
Cyren W32/Ransom.GS.gen!Eldorado
Symantec Packed.Generic.493
APEX Malicious
Paloalto generic.ml
ClamAV Win.Trojan.Poison-7349717-0
Kaspersky HEUR:Backdoor.Win32.Tofsee.pef
Alibaba Backdoor:Win32/Tofsee.bd5f2675
NANO-Antivirus Trojan.Win32.Poison.esqkmb
ViRobot Trojan.Win32.Z.Poison.11380224
Rising Ransom.Locky!8.1CD4 (TFE:5:i267r9wgkgR)
Ad-Aware Trojan.GenericKDZ.40409
Comodo TrojWare.Win32.Ransom.Locky.AF@7976es
DrWeb Trojan.Siggen10.39460
VIPRE Trojan.Win32.Generic!BT
Invincea ML/PE-A + Mal/Elenoocka-E
McAfee-GW-Edition BehavesLike.Win32.Generic.vc
Sophos Mal/Elenoocka-E
Ikarus Trojan.Win32.Tofsee
Jiangmin Backdoor.Poison.ara
Webroot W32.Trojan.Gen
Avira HEUR/AGEN.1120893
MAX malware (ai score=80)
Microsoft Backdoor:Win32/Tofsee.T
Arcabit Trojan.Generic.D9DD9
ZoneAlarm HEUR:Backdoor.Win32.Tofsee.pef
GData Win32.Trojan.Kryptik.IT
AhnLab-V3 Win-Trojan/Lukitus3.Exp
Acronis suspicious
BitDefenderTheta Gen:NN.ZexaF.34590.@tW@ai3NuEli
ALYac Trojan.GenericKDZ.40409
VBA32 Backdoor.Poison
Panda Trj/CI.A
ESET-NOD32 a variant of Win32/Kryptik.FWNZ
Tencent Malware.Win32.Gencirc.10bac95f
Yandex Trojan.GenAsa!XerlMIHYAYg
SentinelOne DFI – Malicious PE
eGambit Unsafe.AI_Score_99%
Fortinet W32/Kryptik.FYKK!tr
AVG Win32:Malware-gen
Cybereason malicious.b30e92
Avast Win32:Malware-gen
Qihoo-360 Win32/Backdoor.417

How to remove Win32/Kryptik.FWNZ 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

The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

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/Kryptik.FWNZ 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/Kryptik.FWNZ 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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