What is Win32/Delf.OKU infection?

In this post you will certainly discover about the interpretation of Win32/Delf.OKU as well as its adverse effect on your computer. Such ransomware are a kind of malware that is elaborated by on the internet frauds to demand paying the ransom by a target.

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Most of the instances, Win32/Delf.OKU ransomware will advise its targets to launch funds move for the purpose of reducing the effects of the modifications that the Trojan infection has presented to the victim’s device.

Win32/Delf.OKU Summary

These alterations can be as follows:

  • 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.
  • 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: Portuguese (Brazilian);
  • 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;
  • 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
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents found on the sufferer’s disk drive — so the victim can no more utilize 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 regular channels whereby Win32/Delf.OKU Ransomware are infused are:

  • By ways of phishing e-mails;
  • As a consequence of user winding up on a source that organizes a harmful software;

As quickly as the Trojan is effectively infused, it will certainly either cipher the information on the victim’s PC or protect against the tool from operating in a proper fashion – while also positioning a ransom note that points out the requirement for the victims to effect the settlement for the function of decrypting the records or bring back the file system back to the first condition. In a lot of instances, the ransom money note will certainly turn up when the client restarts the PC after the system has actually already been damaged.

Win32/Delf.OKU circulation networks.

In numerous edges of the globe, Win32/Delf.OKU grows by jumps as well as bounds. Nevertheless, the ransom money notes as well as tricks of obtaining the ransom money quantity may differ relying on certain neighborhood (local) setups. The ransom notes as well as techniques of obtaining the ransom money quantity may differ depending on certain local (regional) setups.

Ransomware injection

As an example:

    Faulty alerts regarding unlicensed software application.

    In certain areas, the Trojans frequently wrongfully report having actually detected some unlicensed applications enabled on the sufferer’s device. The sharp then requires the user to pay the ransom.

    Faulty declarations concerning unlawful content.

    In countries where software application piracy is much less prominent, this method is not as reliable for the cyber fraudulences. Additionally, the Win32/Delf.OKU popup alert may incorrectly assert to be originating from a police institution and also will certainly report having situated youngster pornography or various other prohibited data on the tool.

    Win32/Delf.OKU popup alert might wrongly declare to be acquiring from a law enforcement establishment as well as will report having located kid pornography or various other prohibited information on the gadget. The alert will likewise include a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: EFA1FE9B
md5: a6a4f14f9f343a4386beff28c39f8df7
name: A6A4F14F9F343A4386BEFF28C39F8DF7.mlw
sha1: d38f62c9f27a2166e074d62c2ae2801005b99052
sha256: 88970293accc14f52ff0de4d31ab88d87ba9bd2c0c24d4c1f6f99fbc195f795b
sha512: 1bb8b50e780bd89e75de8a408404b5e61f75cf839eea01aab8cea674e28239348fad626f112a8f603b77743835a373c952f91d2266be49aec1d7ff37f9e8deea
ssdeep: 24576:pZWbYFo8zwVeNdEiX6RAkB7MvYT9AIC3LDi2TjJTpPR7KIbUr:pk8EV2dEiqWwu9fi2TVpPhPbg
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

CompanyName: Oi SA
ProductName: OI SISTEMA
FileDescription: SAC SISTEMA OI
Translation: 0x0409 0x04e4

Win32/Delf.OKU also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
Elastic malicious (high confidence)
DrWeb Trojan.PWS.Stealer.23631
Cynet Malicious (score: 85)
ALYac Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb
Zillya Trojan.PornoAsset.Win32.23420
Sangfor Trojan.Win32.Delf.8
Cybereason malicious.f9f343
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Delf.OKU
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan-Ransom.Win32.PornoAsset.dcmz
BitDefender Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb
NANO-Antivirus Trojan.Win32.Delphi.ezaexk
MicroWorld-eScan Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb
Tencent Win32.Trojan.Pornoasset.Lnnw
Ad-Aware Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb
Sophos Mal/Generic-S
Comodo Malware@#2sa6iinbnec1y
BitDefenderTheta AI:Packer.DA7A858B17
VIPRE Trojan.Win32.Generic!BT
Emsisoft Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb (B)
Jiangmin Trojan.PornoAsset.fnl
Avira DR/Delphi.Gen
eGambit Unsafe.AI_Score_99%
Microsoft Trojan:Win32/Skeeyah.A!rfn
Arcabit Trojan.Heur3.LPT.EB19DA
GData Gen:Trojan.Heur3.LPT.SH0@a4VeYEkOb
McAfee Artemis!A6A4F14F9F34
MAX malware (ai score=93)
Malwarebytes MachineLearning/Anomalous.100%
Panda Trj/CI.A
Rising Trojan.Delf!8.67 (CLOUD)
Yandex Trojan.GenAsa!9kNCFjVs2WI
Ikarus Backdoor.Win32.Hupigon
Fortinet W32/Delf.OKU!tr
AVG Win32:Malware-gen
Qihoo-360 Win32/Backdoor.Skeeyah.HgIASOUA

How to remove Win32/Delf.OKU virus?

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/Delf.OKU 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/Delf.OKU 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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