Win32/Kryptik.FOSU

What is Win32/Kryptik.FOSU infection?

In this short article you will certainly discover concerning the meaning of Win32/Kryptik.FOSU and its negative effect on your computer system. Such ransomware are a form of malware that is clarified by online scams to demand paying the ransom by a sufferer.

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In the majority of the cases, Win32/Kryptik.FOSU virus will advise its sufferers to launch funds transfer for the purpose of neutralizing the changes that the Trojan infection has introduced to the victim’s device.

Win32/Kryptik.FOSU Summary

These adjustments 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.
  • 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.
  • At least one IP Address, Domain, or File Name was found in a crypto call;
  • A process created a hidden window;
  • 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;
  • Attempts to delete volume shadow copies;
  • Attempts to remove evidence of file being downloaded from the Internet;
  • Creates or sets a registry key to a long series of bytes, possibly to store a binary or malware config;
  • Steals private information from local Internet browsers;
  • 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 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.
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Creates a copy of itself;
  • 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 records located on the target’s disk drive — so the victim can no more use the data;
  • Preventing regular accessibility to the victim’s workstation;

Win32/Kryptik.FOSU

The most normal networks where Win32/Kryptik.FOSU Trojans are injected are:

  • By ways of phishing e-mails;
  • As a repercussion of user winding up on a resource that organizes a malicious software;

As quickly as the Trojan is efficiently injected, it will either cipher the information on the victim’s PC or avoid the gadget from working in a correct fashion – while additionally placing a ransom note that mentions the demand for the targets to effect the repayment for the purpose of decrypting the records or bring back the documents system back to the first problem. In many instances, the ransom note will show up when the customer restarts the COMPUTER after the system has currently been damaged.

Win32/Kryptik.FOSU circulation networks.

In numerous corners of the world, Win32/Kryptik.FOSU expands by leaps as well as bounds. However, the ransom notes and methods of extorting the ransom money amount may differ depending on certain local (regional) setups. The ransom money notes and tricks of obtaining the ransom amount may differ depending on particular local (local) setups.

Ransomware injection

For instance:

    Faulty notifies about unlicensed software program.

    In particular locations, the Trojans frequently wrongfully report having actually detected some unlicensed applications made it possible for on the target’s device. The sharp then requires the customer to pay the ransom.

    Faulty declarations about unlawful content.

    In countries where software program piracy is much less popular, this approach is not as efficient for the cyber scams. Additionally, the Win32/Kryptik.FOSU popup alert may falsely declare to be deriving from a law enforcement establishment as well as will certainly report having situated child porn or various other illegal data on the device.

    Win32/Kryptik.FOSU popup alert might incorrectly assert to be deriving from a law enforcement organization and also will report having situated child pornography or various other unlawful information on the device. The alert will similarly contain a requirement for the customer to pay the ransom.

Technical details

File Info:

crc32: 4F7571AC
md5: 4428735baf5dbfedfdbebce900fb353a
name: 4428735BAF5DBFEDFDBEBCE900FB353A.mlw
sha1: 7a27ead01145d878225f52db6507b91ce9c835b1
sha256: b5c82043ab6d722434f635f85ebec9faa058622c86cc2731b0d4936a1e6227eb
sha512: c2e43fbbd92550741d483d6569e74548e76508a335a688c98c40ea72913d1a79938e2271a361cbdff4554d58a78da5625c643a4689f2b191ed1626823fccc3a8
ssdeep: 768:plwLveNbKzidlVY59kbKzidlVY59kbKzidlAmVLybKzidlVY59+lSd05hLYVPIq:plwLv6Kr5UKr5UKu6Kr5U4dpDGV48E
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Kryptik.FOSU also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 00515aa21 )
Elastic malicious (high confidence)
DrWeb Trojan.Encoder.10103
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.Exxroute.A3
ALYac Trojan.Dalexis.Gen.1
Cylance Unsafe
Zillya Trojan.Kryptik.Win32.1436407
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Ransom:Win32/Spora.5fe6224b
K7GW Trojan ( 00515aa21 )
Cybereason malicious.baf5db
Cyren W32/Ransom.CW.gen!Eldorado
Symantec Packed.Generic.493
ESET-NOD32 a variant of Win32/Kryptik.FOSU
APEX Malicious
Avast Win32:Malware-gen
ClamAV Win.Ransomware.Razy-9808404-0
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Trojan.Dalexis.Gen.1
NANO-Antivirus Trojan.Win32.Yakes.elwdgv
MicroWorld-eScan Trojan.Dalexis.Gen.1
Tencent Malware.Win32.Gencirc.10b5879e
Ad-Aware Trojan.Dalexis.Gen.1
Sophos ML/PE-A + Mal/Elenoocka-E
Comodo TrojWare.Win32.Crypt.CA@6ykcle
F-Secure Heuristic.HEUR/AGEN.1105007
BitDefenderTheta Gen:NN.ZexaF.34628.fqW@a8cr8ko
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_HPCERBER.SMONT4
McAfee-GW-Edition BehavesLike.Win32.Generic.mh
FireEye Generic.mg.4428735baf5dbfed
Emsisoft Trojan.Dalexis.Gen.1 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.Generic.atfsq
Webroot Trojan.Dropper.Gen
Avira HEUR/AGEN.1105007
eGambit Unsafe.AI_Score_83%
Antiy-AVL Trojan[Ransom]/Win32.Spora
Kingsoft Win32.Heur.KVMH017.a.(kcloud)
Microsoft Ransom:Win32/Spora.A
Arcabit Trojan.Dalexis.Gen.1
AegisLab Trojan.Win32.Spora.4!c
ZoneAlarm HEUR:Trojan.Win32.Generic
GData Trojan.Dalexis.Gen.1
AhnLab-V3 Trojan/Win32.Cerber.R198878
Acronis suspicious
McAfee Ransomware-FMJ!4428735BAF5D
MAX malware (ai score=80)
VBA32 BScope.Trojan.Zbot.2312
Malwarebytes Ransom.Cerber
Panda Trj/Genetic.gen
TrendMicro-HouseCall Ransom_HPCERBER.SMONT4
Rising Ransom.Cerber!8.3058 (CLOUD)
Yandex Trojan.GenAsa!g4m8kxlnc38
Ikarus Trojan.Ransom.Spora
Fortinet W32/Kryptik.FONH!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Trojan.917

How to remove Win32/Kryptik.FOSU 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/Kryptik.FOSU 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.FOSU 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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