Win32/Kryptik.FWNN

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

What is Win32/Kryptik.FWNN infection?

In this post you will certainly locate concerning the definition of Win32/Kryptik.FWNN and its negative influence on your computer system. Such ransomware are a type of malware that is clarified by on-line scams to demand paying the ransom money by a target.

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Most of the situations, Win32/Kryptik.FWNN infection will certainly instruct its sufferers to launch funds transfer for the function of counteracting the modifications that the Trojan infection has introduced to the target’s gadget.

Win32/Kryptik.FWNN Summary

These adjustments 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.
  • 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;
  • 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
  • Ciphering the files situated on the sufferer’s hard drive — so the target can no more make use of the information;
  • Preventing normal accessibility to the sufferer’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/Kryptik.FWNN

The most typical networks whereby Win32/Kryptik.FWNN Ransomware are injected 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 consequence of user ending up on a source that organizes a harmful software program;

As soon as the Trojan is effectively infused, it will either cipher the data on the victim’s PC or stop the device from operating in an appropriate fashion – while likewise putting a ransom money note that discusses the demand for the targets to impact the payment for the function of decrypting the records or bring back the documents system back to the first problem. In most instances, the ransom money note will come up when the client reboots the COMPUTER after the system has currently been damaged.

Win32/Kryptik.FWNN distribution networks.

In numerous corners of the world, Win32/Kryptik.FWNN expands by jumps and bounds. Nonetheless, the ransom money notes as well as methods of extorting the ransom money amount might differ relying on certain regional (local) setups. The ransom money notes and also methods of extorting the ransom money amount might differ depending on certain neighborhood (local) setups.

Ransomware injection

For instance:

    Faulty signals about unlicensed software application.

    In specific locations, the Trojans commonly wrongfully report having actually spotted some unlicensed applications allowed on the target’s tool. The alert then demands the individual to pay the ransom.

    Faulty statements concerning prohibited content.

    In countries where software program piracy is much less popular, this method is not as efficient for the cyber fraudulences. Additionally, the Win32/Kryptik.FWNN popup alert may incorrectly claim to be deriving from a police organization as well as will report having situated child pornography or various other prohibited information on the tool.

    Win32/Kryptik.FWNN popup alert may wrongly claim to be obtaining from a law enforcement institution and also will certainly report having situated kid porn or various other illegal data on the device. The alert will in a similar way contain a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: 2CE7EE55
md5: 6d406a3d669c717432d7930dbbcec819
name: 6D406A3D669C717432D7930DBBCEC819.mlw
sha1: 032130b9b77099902d61c5ad409f8cdab3e3e1a7
sha256: f9e0f9e9b660b826bc5cb3ac42a2ac0ff0bebca594f2efd2429eb4b766fa85fe
sha512: 7ab7e0ded51564e0df969ca61337341291a6397132c66ccd6f6c4b65b227dbe8837fd7b6a9d8234383563551d77fa44c66b9977e4024d245e4b766398741213b
ssdeep: 1536:J89goQyCPjB0gCtKKKKKKelYqMH7cpCAsRYPnGt59I3HbF8SWUHdBtXgl56xBKm:EgoQyeBeKKKKKKeRQyPGpIranUHdTg5
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Kryptik.FWNN also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 0051918c1 )
Elastic malicious (high confidence)
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.Exxroute.A4
ALYac Gen:Heur.Ransom.Lukitos.1
Cylance Unsafe
Zillya Trojan.Kryptik.Win32.1255487
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Backdoor:Win32/Tofsee.fc1c8133
K7GW Trojan ( 00516a671 )
Cybereason malicious.d669c7
Cyren W32/Ransom.GS.gen!Eldorado
Symantec Packed.Generic.493
ESET-NOD32 a variant of Win32/Kryptik.FWNN
APEX Malicious
Avast Win32:Malware-gen
ClamAV Win.Ransomware.Lukitos-9223537-0
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Gen:Heur.Ransom.Lukitos.1
NANO-Antivirus Trojan.Win32.Poison.esqbls
SUPERAntiSpyware Ransom.Cerber/Variant
MicroWorld-eScan Gen:Heur.Ransom.Lukitos.1
Tencent Malware.Win32.Gencirc.10baebd6
Ad-Aware Gen:Heur.Ransom.Lukitos.1
Sophos ML/PE-A + Mal/Elenoocka-E
Comodo TrojWare.Win32.Crypt.LKS@790qiy
BitDefenderTheta Gen:NN.ZexaF.34670.nqW@a0iTZxbi
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_CERBER.SMALY0
McAfee-GW-Edition BehavesLike.Win32.Emotet.dc
FireEye Generic.mg.6d406a3d669c7174
Emsisoft Gen:Heur.Ransom.Lukitos.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Backdoor.Poison.aqf
Avira HEUR/AGEN.1120891
eGambit Unsafe.AI_Score_74%
Microsoft Backdoor:Win32/Tofsee.T
Arcabit Trojan.Ransom.Lukitos.1
AegisLab Trojan.Win32.Poison.m!c
GData Win32.Trojan.Kryptik.IT
AhnLab-V3 Win-Trojan/Lukitus3.Exp
Acronis suspicious
McAfee Ransomware-GFC!6D406A3D669C
MAX malware (ai score=100)
VBA32 Backdoor.Poison
Malwarebytes Backdoor.Tofsee
Panda Trj/Genetic.gen
TrendMicro-HouseCall Ransom_CERBER.SMALY0
Rising Ransom.Locky!8.1CD4 (CLOUD)
Yandex Trojan.GenAsa!eqC0Gv0ggnw
Ikarus Trojan.Win32.Tofsee
Fortinet W32/Kryptik.FYKK!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Backdoor.Tofsee.HxQBEpsA

How to remove Win32/Kryptik.FWNN 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 Win32/Kryptik.FWNN 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.FWNN 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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