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

What is Win32/Filecoder.OAI infection?

In this article you will certainly discover regarding the interpretation of Win32/Filecoder.OAI as well as its negative influence on your computer. Such ransomware are a kind of malware that is specified by on-line fraudulences to require paying the ransom by a sufferer.

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Most of the situations, Win32/Filecoder.OAI infection will advise its victims to initiate funds transfer for the function of neutralizing the amendments that the Trojan infection has actually presented to the sufferer’s tool.

Win32/Filecoder.OAI Summary

These adjustments can be as complies with:

  • At least one process apparently crashed during execution;
  • A process attempted to delay the analysis task.;
  • Performs some HTTP requests;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Attempts to stop active services;
  • A process was set to shut the system down when terminated;
  • 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.
  • 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.
  • 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 found on the sufferer’s disk drive — so the victim can no more make use of the information;
  • Preventing normal accessibility to the sufferer’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 Ransom.Cerber!8.3058 (TFE:3:kVUQpKgEl8K) Ransom.Cerber!8.3058 (TFE:3:kVUQpKgEl8K) Ransom.Cerber!8.3058 (TFE:3:kVUQpKgEl8K)


The most typical networks whereby Win32/Filecoder.OAI Trojans are injected are:

  • By means of phishing emails;
  • As an effect of user ending up on a resource that hosts a malicious software program;

As soon as the Trojan is effectively infused, it will either cipher the information on the victim’s computer or avoid the tool from operating in an appropriate way – while also placing a ransom note that discusses the need for the sufferers to impact the repayment for the function of decrypting the documents or recovering the file system back to the preliminary condition. In many circumstances, the ransom money note will turn up when the customer reboots the PC after the system has already been harmed.

Win32/Filecoder.OAI circulation networks.

In numerous edges of the globe, Win32/Filecoder.OAI expands by jumps and bounds. Nonetheless, the ransom notes as well as tricks of obtaining the ransom money amount may differ depending upon certain neighborhood (local) settings. The ransom money notes and also techniques of obtaining the ransom quantity might vary depending on particular neighborhood (local) settings.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software.

    In particular areas, the Trojans frequently wrongfully report having spotted some unlicensed applications enabled on the target’s gadget. The alert after that requires the individual to pay the ransom money.

    Faulty statements regarding prohibited material.

    In countries where software application piracy is less popular, this method is not as efficient for the cyber frauds. Additionally, the Win32/Filecoder.OAI popup alert may incorrectly declare to be stemming from a law enforcement institution and will certainly report having located kid pornography or various other prohibited data on the device.

    Win32/Filecoder.OAI popup alert may falsely declare to be deriving from a legislation enforcement organization and will certainly report having situated child pornography or various other prohibited data on the gadget. The alert will likewise contain a demand for the user to pay the ransom.

Technical details

File Info:

crc32: D484F64C
md5: 99e9d08f5158274c3be9a6b3be8d4ce1
name: 99E9D08F5158274C3BE9A6B3BE8D4CE1.mlw
sha1: f8ca3d73bb6c185a57a76133e16f2fcb6eeea891
sha256: 43bbfb3389deb3846bba19a8ab2e9c8fd9b581720962b8170d4a63ad816b5804
sha512: 38802b078cab8dd58a0f1ac0323b03a261abcb29753f4b730fb84db4dad26d00055eb5956f13f698aabbdbca944a0b0af675fc2a61cbfe25065d1b959e10ad4d
ssdeep: 3072:1vbpJmiFzydf1GAvjiETNFdbLxmMZuB3b+Xt2b+CpaSy:tbT72B5fno6X87af
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: xa9 Microsoft Corporation. All rights reserved.
InternalName: ktmutil.exe
FileVersion: 10.0.18362.1 (WinBuild.160101.0800)
CompanyName: Microsoft Corporation
ProductName: Microsoftxae Windowsxae Operating System
ProductVersion: 10.0.18362.1
FileDescription: Kernel Transaction Management Utility
OriginalFilename: ktmutil.exe
Translation: 0x0409 0x04b0

Win32/Filecoder.OAI also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
Elastic malicious (high confidence)
Cynet Malicious (score: 100)
ALYac Gen:Variant.Ser.Razy.10049
Cylance Unsafe
CrowdStrike win/malicious_confidence_100% (W)
K7GW Trojan ( 005651361 )
K7AntiVirus Trojan ( 005651361 )
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Filecoder.OAI
APEX Malicious
Avast Win32:SuspBehav-B [Heur]
BitDefender Gen:Variant.Ser.Razy.10049
MicroWorld-eScan Gen:Variant.Ser.Razy.10049
Ad-Aware Gen:Variant.Ser.Razy.10049
Sophos Mal/Generic-S
BitDefenderTheta Gen:NN.ZexaF.34688.hu0@a0zxE1j
VIPRE Trojan.Win32.Generic!BT
Emsisoft Gen:Variant.Ser.Razy.10049 (B)
SentinelOne Static AI – Malicious PE
Avira TR/Crypt.XPACK.Gen2
Microsoft Trojan:Win32/Wacatac.B!ml
GData Gen:Variant.Ser.Razy.10049
AhnLab-V3 Trojan/Win.Generic.C4447798
McAfee Artemis!99E9D08F5158
MAX malware (ai score=81)
Panda Trj/GdSda.A
TrendMicro-HouseCall TROJ_GEN.R02DH0CE421
Rising Ransom.Cerber!8.3058 (TFE:3:kVUQpKgEl8K)
Fortinet W32/Gimemo.BKAA!tr
AVG Win32:SuspBehav-B [Heur]

How to remove Win32/Filecoder.OAI 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/Filecoder.OAI 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/Filecoder.OAI you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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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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