Written by Robert Bailey

What is Trojan:Win32/Sehyioa.A!rfn infection?

In this short article you will locate concerning the interpretation of Trojan:Win32/Sehyioa.A!rfn and its unfavorable impact on your computer. Such ransomware are a kind of malware that is clarified by online scams to demand paying the ransom by a target.

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Most of the instances, Trojan:Win32/Sehyioa.A!rfn ransomware will advise its targets to initiate funds move for the function of counteracting the changes that the Trojan infection has presented to the victim’s gadget.

Trojan:Win32/Sehyioa.A!rfn Summary

These adjustments can be as follows:

  • 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.
  • A process attempted to delay the analysis task.;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • 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.
  • Unconventionial language used in binary resources: Serbian;
  • Detects the presence of Wine emulator via function name;
  • Detects Sandboxie through the presence of a library;
  • Detects SunBelt Sandbox through the presence of a library;
  • Attempts to remove evidence of file being downloaded from the Internet;
  • 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
  • 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.
  • Operates on local firewall’s policies and settings;
  • Creates a copy of itself;
  • Attempts to disable System Restore. System Restore function – allows you to revert the computer’s state (system files, applications, and system settings) to that of a previous point in time, which can be used to recover after a virus attack.
  • Attempts to modify or disable Security Center warnings;
  • Ciphering the files located on the victim’s disk drive — so the target can no more make use of the information;
  • Preventing routine accessibility 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.


One of the most common channels whereby Trojan:Win32/Sehyioa.A!rfn Ransomware Trojans are infused are:

  • By ways of phishing emails;
  • As an effect of user winding up on a source that holds a malicious software;

As soon as the Trojan is effectively injected, it will either cipher the information on the sufferer’s computer or avoid the gadget from functioning in an appropriate way – while likewise placing a ransom note that states the need for the targets to impact the settlement for the function of decrypting the files or bring back the data system back to the initial condition. In many circumstances, the ransom money note will show up when the client reboots the PC after the system has actually currently been damaged.

Trojan:Win32/Sehyioa.A!rfn distribution networks.

In various edges of the globe, Trojan:Win32/Sehyioa.A!rfn grows by jumps and bounds. Nonetheless, the ransom notes as well as methods of obtaining the ransom quantity might differ depending on specific neighborhood (regional) settings. The ransom notes and methods of obtaining the ransom quantity may differ depending on specific regional (local) settings.

Ransomware injection

For instance:

    Faulty signals regarding unlicensed software program.

    In specific areas, the Trojans typically wrongfully report having actually discovered some unlicensed applications made it possible for on the sufferer’s tool. The sharp then requires the individual to pay the ransom money.

    Faulty statements about prohibited material.

    In countries where software piracy is less popular, this method is not as efficient for the cyber fraudulences. Alternatively, the Trojan:Win32/Sehyioa.A!rfn popup alert may wrongly declare to be stemming from a law enforcement institution as well as will report having situated youngster porn or other prohibited information on the tool.

    Trojan:Win32/Sehyioa.A!rfn popup alert may incorrectly claim to be acquiring from a legislation enforcement establishment as well as will certainly report having located kid pornography or various other prohibited information on the tool. The alert will in a similar way contain a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: EA7AEFFF
md5: a03adcccc62d55a902431e224c515d89
name: A03ADCCCC62D55A902431E224C515D89.mlw
sha1: cd04fce481c2e0cfb56d4319ac9745d75bbb0fc6
sha256: c8814e01dbff9bf90a29cc11f9ada589481a61d41d8182006e695173e31da662
sha512: ff8a7dcbaea7646193c704180dc35c3006f259a89e8881df837493e59c961d42beeb2f8b6874d41fd90cf9570627309b2d2c12d6bac403dcc1a61221733b5b32
ssdeep: 3072:nW8PAiLFBG5Ko9WZEa5ZVK0KytRmxpQFEmXfMugk:WMy5V9wjVK0Kyt1VvMu
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Copyright (C) 2018, havawuxuzarabel
InternalName: yajacen.exe

Trojan:Win32/Sehyioa.A!rfn also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.TryutcarG.Trojan
K7AntiVirus Trojan ( 00543e471 )
Elastic malicious (high confidence)
DrWeb Trojan.BtcMine.3164
Cynet Malicious (score: 100)
CAT-QuickHeal Trojan.Fuerboos
ALYac Trojan.Ransomware.GenericKDS.31398566
Cylance Unsafe
Zillya Trojan.Bayrob.Win32.33563
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (W)
Alibaba TrojanPSW:Win32/Kryptik.b3054eda
K7GW Trojan ( 00543e471 )
Cybereason malicious.cc62d5
ESET-NOD32 a variant of Win32/Kryptik.GNOI
APEX Malicious
Avast Win32:Malware-gen
Kaspersky HEUR:Trojan-PSW.Win32.Azorult.gen
BitDefender Trojan.Ransomware.GenericKDS.31398566
NANO-Antivirus Trojan.Win32.Bayrob.fkyxag
MicroWorld-eScan Trojan.Ransomware.GenericKDS.31398566
Tencent Win32.Trojan.Generic.Liqc
Ad-Aware Trojan.Ransomware.GenericKDS.31398566
Comodo TrojWare.Win32.Chapak.OI@82a1oa
VIPRE Trojan.Win32.Generic!BT
TrendMicro Trojan.Win32.GANDCRAB.OIBOAS
Emsisoft Trojan.Ransomware.GenericKDS.31398566 (B)
Jiangmin Trojan.Bayrob.asxg
Webroot W32.Adware.Installcore
Avira TR/Crypt.XPACK.Gen2
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Microsoft Trojan:Win32/Sehyioa.A!rfn
Arcabit Trojan.Ransomware.GenericS.D1DF1AA6
AegisLab Trojan.Win32.Azorult.i!c
GData Trojan.Ransomware.GenericKDS.31398566
AhnLab-V3 Win-Trojan/MalPe4.Suspicious.X1939
McAfee Trojan-FPST!A03ADCCCC62D
MAX malware (ai score=100)
VBA32 BScope.Trojan.Fuery
Malwarebytes Trojan.MalPack
Panda Trj/CI.A
TrendMicro-HouseCall Trojan.Win32.GANDCRAB.OIBOAS
Rising Ransom.GandCrypt!1.B648 (CLOUD)
Yandex Trojan.GenAsa!V6cDxHGAcUg
MaxSecure Ransomeware.GandCrypt.JZ
Fortinet W32/GenKryptik.CUPF!tr
AVG Win32:Malware-gen
Qihoo-360 Win32/TrojanSpy.Azorult.HwoCuKMA

How to remove Trojan:Win32/Sehyioa.A!rfn 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 Trojan:Win32/Sehyioa.A!rfn 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:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Trojan:Win32/Sehyioa.A!rfn you can always ask me in the comments for getting help.

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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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