Win32/Kryptik.ESFV

What is Win32/Kryptik.ESFV infection?

In this article you will find regarding the interpretation of Win32/Kryptik.ESFV and also its negative impact on your computer. Such ransomware are a form of malware that is clarified by on the internet scams to demand paying the ransom by a target.

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Most of the instances, Win32/Kryptik.ESFV virus will instruct its victims to initiate funds move for the purpose of counteracting the changes that the Trojan infection has actually presented to the victim’s tool.

Win32/Kryptik.ESFV Summary

These alterations 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);
  • Injection (Process Hollowing);
  • Compression (or decompression);
  • 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.
  • A process attempted to delay the analysis task.;
  • 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.

  • Unconventionial language used in binary resources: Bulgarian;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Executed a process and injected code into it, probably while unpacking;
  • Exhibits behavior characteristic of Andromeda/Gamarue malware;
  • Attempts to stop active services;
  • Tries to unhook or modify Windows functions monitored by Cuckoo;
  • Mimics the file times of a Windows system file;
  • 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
  • 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.
  • Creates a copy of itself;
  • Attempts to disable UAC.

    User Account Control or just UAC is a part of the Windows security system which prevents apps from making unwanted changes on PC.

    UAC includes several technologies 1:

    • File and egistry Virtualization;
    • Same-desktop Elevation;
    • Filtered Token;
    • User Interface Privilege Isolation;
    • Protected Mode Internet Explorer;
    • Installer Detection;
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Attempts to modify Explorer settings to prevent hidden files from being displayed;
  • Attempts to modify user notification settings;
  • Ciphering the papers found on the target’s disk drive — so the sufferer can no more use the information;
  • Preventing regular access 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.

Win32/Kryptik.ESFV

One of the most regular channels where Win32/Kryptik.ESFV Trojans are injected are:

  • By ways of phishing e-mails;
  • As a repercussion of individual ending up on a source that organizes a harmful software;

As soon as the Trojan is successfully infused, it will certainly either cipher the information on the sufferer’s PC or prevent the device from functioning in an appropriate way – while additionally putting a ransom money note that mentions the need for the sufferers to impact the payment for the purpose of decrypting the papers or bring back the data system back to the first problem. In many instances, the ransom note will show up when the client reboots the COMPUTER after the system has actually currently been harmed.

Win32/Kryptik.ESFV circulation networks.

In different edges of the world, Win32/Kryptik.ESFV expands by leaps and also bounds. Nonetheless, the ransom notes and techniques of extorting the ransom amount may differ relying on particular local (local) settings. The ransom notes and methods of extorting the ransom quantity might vary depending on particular regional (regional) settings.

Ransomware injection

For example:

    Faulty notifies regarding unlicensed software.

    In particular areas, the Trojans usually wrongfully report having actually spotted some unlicensed applications enabled on the victim’s device. The alert then requires the user to pay the ransom money.

    Faulty declarations regarding unlawful content.

    In countries where software application piracy is much less prominent, this approach is not as effective for the cyber frauds. Conversely, the Win32/Kryptik.ESFV popup alert may falsely claim to be stemming from a law enforcement institution as well as will report having situated child porn or other unlawful information on the tool.

    Win32/Kryptik.ESFV popup alert may incorrectly declare to be obtaining from a regulation enforcement organization as well as will certainly report having situated kid porn or various other prohibited data on the gadget. The alert will similarly consist of a need for the customer to pay the ransom.

Technical details

File Info:

crc32: 2EF50177
md5: 8e5aa79fe68b88513435f0bcb03dddae
name: 8E5AA79FE68B88513435F0BCB03DDDAE.mlw
sha1: 44593785540e3eca297ab2335284fd2ed5bbea76
sha256: df4a00cefda94fd8e9c271d1aca219d8c7f3615417749ab4d25e2892f863c386
sha512: eaf7fd6ae8bee9608635cbaa1f083e64f52b026fbe0ba661703af538559cbe60733ea5d445a65bf3682a7c8f7b657c276284e9fe7a8cbc06157e8266c69c128e
ssdeep: 3072:QQnN2PZAx2VmK3L3E+MtxmePYiwwlUDRtthL:WRVbEFthb7lUDRDhL
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Copyright xa9 2017
InternalName: Lama
FileVersion: 179, 94, 82, 152
CompanyName: DM - www.cfdan.com
ProductName: Navigational Italicise
ProductVersion: 166, 131, 191, 13
FileDescription: Laddered

Win32/Kryptik.ESFV also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Trojan ( 0055dd191 )
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader20.35
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.TesCrypt.V4
ALYac Trojan.TeslaCrypt.EP
Cylance Unsafe
Zillya Trojan.CryptGen.Win32.1
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba Worm:Win32/Gamarue.f97913f6
K7GW Trojan ( 0055dd191 )
Cybereason malicious.fe68b8
Cyren W32/Trojan.SZLB-9337
Symantec Trojan.Gen
ESET-NOD32 a variant of Win32/Kryptik.ESFV
APEX Malicious
Avast Win32:Dorder-X [Trj]
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Trojan.TeslaCrypt.EP
NANO-Antivirus Trojan.Win32.Dwn.ebelkb
ViRobot Trojan.Win32.Locky.Gen.C
MicroWorld-eScan Trojan.TeslaCrypt.EP
Tencent Malware.Win32.Gencirc.10ba10cc
Ad-Aware Trojan.TeslaCrypt.EP
Sophos Mal/Generic-R + Troj/Ransom-CYD
Comodo Malware@#3a6926vze2wfd
BitDefenderTheta Gen:NN.ZexaF.34628.hq0@amITBokO
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_HPLOCKY.SM1
McAfee-GW-Edition Gamarue-FDM!8E5AA79FE68B
FireEye Generic.mg.8e5aa79fe68b8851
Emsisoft Trojan.TeslaCrypt.EP (B)
SentinelOne Static AI – Malicious PE
Jiangmin Worm.Gamarue.e
Webroot W32.Trojan.TeslaCrypt
Avira HEUR/AGEN.1111647
eGambit Unsafe.AI_Score_99%
Kingsoft Win32.Troj.GenericKD.v.(kcloud)
Microsoft Worm:Win32/Gamarue
Arcabit Trojan.TeslaCrypt.EP
AegisLab Trojan.Win32.Generic.4!c
GData Trojan.TeslaCrypt.EP
AhnLab-V3 Win-Trojan/Lockycrypt.Gen
Acronis suspicious
McAfee Gamarue-FDM!8E5AA79FE68B
MAX malware (ai score=100)
VBA32 BScope.TrojanDownloader.Talalpek
Panda Trj/CI.A
TrendMicro-HouseCall Ransom_HPLOCKY.SM1
Rising Worm.Gamarue!8.13B (CLOUD)
Yandex Trojan.GenAsa!V2PB5LoDJRE
Ikarus Trojan-Ransom.TeslaCrypt4
Fortinet W32/Kryptik.ESPA!tr
AVG Win32:Dorder-X [Trj]
Qihoo-360 Win32/Ransom.Bitman.HgIASOQA

How to remove Win32/Kryptik.ESFV 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 GridinSoft2

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft3.

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.ESFV 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.ESFV you can always ask me in the comments for getting help.

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References

  1. Microsoft Ignite: How to disable User Account Control (UAC) on Windows Server
  2. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  3. 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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