Win32/Kryptik.FUJN

What is Win32/Kryptik.FUJN infection?

In this post you will certainly find regarding the interpretation of Win32/Kryptik.FUJN and its negative influence on your computer. Such ransomware are a kind of malware that is elaborated by on the internet frauds to demand paying the ransom by a victim.

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In the majority of the instances, Win32/Kryptik.FUJN virus will certainly instruct its targets to launch funds transfer for the function of neutralizing the amendments that the Trojan infection has actually presented to the victim’s tool.

Win32/Kryptik.FUJN Summary

These modifications 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);
  • 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.
  • Mimics the system’s user agent string for its own requests;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • 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.

  • 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;
  • Detects Sandboxie through the presence of a library;
  • Detects the presence of Wine emulator via function name;
  • Tries to unhook or modify Windows functions monitored by Cuckoo;
  • 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
  • Attempts to identify installed analysis tools by a known file location;
  • Checks for the presence of known devices from debuggers and forensic tools;
  • Detects the presence of Wine emulator via registry key;
  • Detects Sandboxie using a known mutex;
  • Checks the version of Bios, possibly for anti-virtualization;
  • Detects VirtualBox through the presence of a device;
  • Detects VirtualBox through the presence of a registry key;
  • Detects VMware through the presence of a device;
  • Detects VMware through the presence of a registry key;
  • Detects Virtual PC using a known mutex;
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Checks for a known DeepFreeze Frozen State Mutex;
  • Collects information to fingerprint the system. There are behavioral human characteristics that can be used to digitally identify a person to grant access to systems, devices, or data. Unlike passwords and verification codes, fingerprints are fundamental parts of user’s identities. Among the threats blocked on biometric data processing and storage systems is spyware, the malware used in phishing attacks (mostly spyware downloaders and droppers), ransomware, and Banking Trojans as posing the greatest danger.
  • Ciphering the documents situated on the target’s hard drive — so the target can no more utilize the information;
  • Preventing routine access to the victim’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.FUJN

One of the most typical networks through which Win32/Kryptik.FUJN are injected are:

  • By means of phishing e-mails;
  • As a repercussion of user ending up on a source that hosts a harmful software application;

As soon as the Trojan is successfully injected, it will certainly either cipher the data on the target’s PC or avoid the gadget from operating in an appropriate way – while likewise positioning a ransom note that mentions the demand for the targets to effect the payment for the purpose of decrypting the records or recovering the file system back to the first condition. In many circumstances, the ransom money note will certainly show up when the customer restarts the PC after the system has actually already been harmed.

Win32/Kryptik.FUJN distribution networks.

In numerous edges of the globe, Win32/Kryptik.FUJN grows by leaps and bounds. Nonetheless, the ransom money notes and methods of obtaining the ransom money amount might vary depending on specific neighborhood (local) settings. The ransom money notes and methods of obtaining the ransom amount might vary depending on particular neighborhood (local) setups.

Ransomware injection

For instance:

    Faulty alerts regarding unlicensed software.

    In specific locations, the Trojans commonly wrongfully report having discovered some unlicensed applications enabled on the target’s gadget. The alert after that requires the individual to pay the ransom.

    Faulty declarations about prohibited material.

    In countries where software program piracy is less popular, this method is not as efficient for the cyber scams. Conversely, the Win32/Kryptik.FUJN popup alert may incorrectly assert to be originating from a police organization as well as will certainly report having situated kid pornography or other prohibited information on the device.

    Win32/Kryptik.FUJN popup alert might falsely claim to be deriving from a regulation enforcement institution as well as will certainly report having situated kid porn or other illegal information on the tool. The alert will likewise consist of a requirement for the customer to pay the ransom money.

Technical details

File Info:

crc32: 449F3FAC
md5: b5deb72aaa20c26928b179058ce57085
name: B5DEB72AAA20C26928B179058CE57085.mlw
sha1: 9dd07789162e808ffcc35a05735953c67e1ad97b
sha256: 927e0d7560dc9673356222998ef81e962af1144d0b2f9f8b6e0e909d4b42169e
sha512: 10f2fa4bd446292241ecf84d63e49546d07b5e17b0247f2046d75c404cebe40f8709d5f5bb0910608dc2490b0076e60bafdb89b16d366fa9f3ee30d249aa5d0b
ssdeep: 6144:h23fX7ekgbPkP+vGsev71YrVtjvlnTnEXoW+7f2+BQ+T7Xtq:h23fXLYPkP+vGzRYrV9lzEXoW+7f2+W
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Masters ITC Tools All rights reserved.
FileVersion: 6.3.37.416
CompanyName: Masters ITC Tools
FileDescription: Closeddead Spitfires Considering Elasticity
LegalTrademarks: Masters ITC Tools All rights reserved.
Comments: Closeddead Spitfires Considering Elasticity
ProductName: Dj
ProductVersion: 6.3.37.416
PrivateBuild: 6.3.37.416
OriginalFilename: Dj.exe
Translation: 0x0409 0x04b0

Win32/Kryptik.FUJN also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Trojan ( 0056e90d1 )
Elastic malicious (high confidence)
DrWeb Trojan.PWS.Panda.11620
Cynet Malicious (score: 100)
ALYac Gen:Variant.Ransom.Cryptomix.1
Cylance Unsafe
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba TrojanSpy:Win32/Panda.873a769b
K7GW Trojan ( 0056e90d1 )
Cybereason malicious.aaa20c
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kryptik.FUJN
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan-Spy.Win32.Panda.ox
BitDefender Gen:Variant.Ransom.Cryptomix.1
NANO-Antivirus Trojan.Win32.Panda.evsdqg
MicroWorld-eScan Gen:Variant.Ransom.Cryptomix.1
Tencent Win32.Trojan-spy.Panda.Phgo
Ad-Aware Gen:Variant.Ransom.Cryptomix.1
Sophos Mal/Generic-S
Comodo Malware@#7blb8u05r31d
BitDefenderTheta Gen:NN.ZexaF.34628.wu0@aq!@Csei
VIPRE Trojan.Win32.Generic!BT
TrendMicro Mal_MiliCry-1h
McAfee-GW-Edition BehavesLike.Win32.Emotet.fc
FireEye Generic.mg.b5deb72aaa20c269
Emsisoft Gen:Variant.Ransom.Cryptomix.1 (B)
Avira HEUR/AGEN.1128643
eGambit Unsafe.AI_Score_99%
Antiy-AVL Trojan/Win32.TSGeneric
Microsoft PWS:Win32/Zbot
AegisLab Trojan.Multi.Generic.4!c
GData Gen:Variant.Ransom.Cryptomix.1
AhnLab-V3 Spyware/Win32.Panda.C4244481
Acronis suspicious
McAfee RDN/GenericRXDT-RI
MAX malware (ai score=100)
VBA32 BScope.Trojan.Yakes
Malwarebytes MachineLearning/Anomalous.95%
Panda Trj/CI.A
TrendMicro-HouseCall Mal_MiliCry-1h
Rising Spyware.Panda!8.AFED (CLOUD)
SentinelOne Static AI – Suspicious PE
Fortinet W32/Kryptik.FUJN!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/TrojanSpy.Panda.HgIASOUA

How to remove Win32/Kryptik.FUJN 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.FUJN 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.FUJN 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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