Win32/Kryptik.FOSL

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

What is Win32/Kryptik.FOSL infection?

In this article you will find about the interpretation of Win32/Kryptik.FOSL and its unfavorable effect on your computer system. Such ransomware are a kind of malware that is specified by on the internet frauds to demand paying the ransom by a victim.

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Most of the situations, Win32/Kryptik.FOSL ransomware will certainly instruct its victims to launch funds transfer for the purpose of neutralizing the amendments that the Trojan infection has actually presented to the sufferer’s device.

Win32/Kryptik.FOSL Summary

These alterations 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.
  • Unconventionial language used in binary resources: Russian;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers located on the sufferer’s hard drive — so the sufferer can no longer make use of the data;
  • 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.
Similar behavior
Related domains
z.whorecord.xyzRansom.Exxroute.A4
a.tomx.xyzRansom.Exxroute.A4

Win32/Kryptik.FOSL

One of the most typical networks where Win32/Kryptik.FOSL are injected are:

  • By means of phishing emails;
  • As a repercussion of individual winding up on a resource that hosts a destructive software program;

As soon as the Trojan is efficiently injected, it will certainly either cipher the information on the victim’s computer or prevent the device from working in a proper manner – while likewise positioning a ransom money note that mentions the requirement for the targets to impact the repayment for the objective of decrypting the records or recovering the file system back to the first problem. In many instances, the ransom money note will show up when the customer restarts the PC after the system has already been damaged.

Win32/Kryptik.FOSL distribution networks.

In different corners of the world, Win32/Kryptik.FOSL grows by jumps and bounds. However, the ransom notes and also methods of extorting the ransom quantity might differ depending upon particular local (regional) settings. The ransom money notes and techniques of obtaining the ransom money quantity might vary depending on particular local (local) setups.

Ransomware injection

For example:

    Faulty signals about unlicensed software program.

    In specific locations, the Trojans often wrongfully report having detected some unlicensed applications made it possible for on the target’s gadget. The alert after that requires the customer to pay the ransom money.

    Faulty declarations concerning prohibited content.

    In countries where software application piracy is much less popular, this technique is not as reliable for the cyber frauds. Conversely, the Win32/Kryptik.FOSL popup alert might wrongly declare to be deriving from a law enforcement establishment and will report having situated child porn or various other prohibited information on the gadget.

    Win32/Kryptik.FOSL popup alert might wrongly assert to be obtaining from a legislation enforcement establishment and will report having located youngster pornography or other prohibited data on the device. The alert will similarly contain a need for the individual to pay the ransom money.

Technical details

File Info:

crc32: 3031AAA9
md5: 8f4ee399b494b492d931e9177ff44899
name: 8F4EE399B494B492D931E9177FF44899.mlw
sha1: 6d2a8661de381fdff764dba16bb7f0fc4c356de4
sha256: 1e870a54fdc1c2e9865dcb773554136e5d5d109e4c4d709c405dbc15cf70f3eb
sha512: 7b97491073ac2193a56de04fcac914bb52fd9c73c77e2c405409d060fd84e535b0259408702fcf0e02c2867918bfb9597866817410813ae6a952cb96a50ee10c
ssdeep: 1536:v/UEuXAWRxyp7kK8bGAOtb9Dmx/rbXbX:6XFSAK8athqrbXbX
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Kryptik.FOSL also known as:

GridinSoftTrojan.Ransom.Gen
BkavW32.AIDetect.malware1
Elasticmalicious (high confidence)
MicroWorld-eScanGen:Variant.Crypt.38
FireEyeGeneric.mg.8f4ee399b494b492
CAT-QuickHealRansom.Exxroute.A4
ALYacGen:Variant.Crypt.38
CylanceUnsafe
VIPRETrojan.Win32.Generic!BT
SangforTrojan.Win32.Save.a
K7AntiVirusTrojan ( 00515aa21 )
BitDefenderGen:Variant.Crypt.38
K7GWTrojan ( 00506d5c1 )
Cybereasonmalicious.9b494b
CyrenW32/S-26bbd9ea!Eldorado
SymantecPacked.Generic.493
APEXMalicious
AvastWin32:Filecoder-BD [Trj]
ClamAVWin.Ransomware.Spora-6172235-0
KasperskyHEUR:Trojan-Ransom.Win32.Spora.pef
AlibabaRansom:Win32/Spora.ca41da95
NANO-AntivirusTrojan.Win32.Spora.elwbyn
AegisLabTrojan.Win32.Generic.4!c
RisingRansom.Spora!8.E3EE (CLOUD)
Ad-AwareGen:Variant.Crypt.38
EmsisoftTrojan-Ransom.Spora (A)
ComodoTrojWare.Win32.Ransom.Spora.FOR@7l1o2i
F-SecureHeuristic.HEUR/AGEN.1105007
DrWebTrojan.Encoder.10103
ZillyaTrojan.Kryptik.Win32.1102398
TrendMicroRansom_SPORA.F117BR
McAfee-GW-EditionBehavesLike.Win32.Generic.kh
SophosML/PE-A + Mal/Elenoocka-E
IkarusTrojan-Ransom.Spora
JiangminTrojan.Spora.dp
WebrootTrojan.Dropper.Gen
AviraHEUR/AGEN.1105007
eGambitUnsafe.AI_Score_98%
Antiy-AVLTrojan/Win32.BTSGeneric
KingsoftWin32.Troj.Undef.(kcloud)
MicrosoftRansom:Win32/Spora
ArcabitTrojan.Crypt.38
ZoneAlarmHEUR:Trojan-Ransom.Win32.Spora.pef
GDataGen:Variant.Crypt.38
CynetMalicious (score: 100)
AhnLab-V3Trojan/Win32.Spora.C1805646
Acronissuspicious
McAfeeRansom-Spora!8F4EE399B494
MAXmalware (ai score=83)
VBA32BScope.Trojan.Encoder
MalwarebytesRansom.Spora
PandaTrj/Genetic.gen
ESET-NOD32a variant of Win32/Kryptik.FOSL
TrendMicro-HouseCallRansom_SPORA.F117BR
TencentMalware.Win32.Gencirc.10b589c0
YandexTrojan.GenAsa!2vZt3XYGVQo
SentinelOneStatic AI – Malicious PE
FortinetW32/Kryptik.GKKB!tr
BitDefenderThetaGen:NN.ZexaF.34590.eqW@a409Xpic
AVGWin32:Filecoder-BD [Trj]
Paloaltogeneric.ml
CrowdStrikewin/malicious_confidence_100% (D)
Qihoo-360Win32/Ransom.Filecoder.HxQBrMcA

How to remove Win32/Kryptik.FOSL 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.FOSL 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.FOSL 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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