Written by Robert Bailey

What is Win32/Delf.NLT infection?

In this short article you will discover about the definition of Win32/Delf.NLT and also its unfavorable influence on your computer system. Such ransomware are a form of malware that is specified by on the internet frauds to require paying the ransom money by a sufferer.

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Most of the instances, Win32/Delf.NLT ransomware will certainly advise its targets to start funds move for the purpose of neutralizing the modifications that the Trojan infection has introduced to the target’s gadget.

Win32/Delf.NLT Summary

These alterations can be as adheres to:

  • 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 created a hidden window;
  • 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.
  • 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
  • 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;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents found on the target’s disk drive — so the victim can no more make use of the data;
  • Preventing routine 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.


The most normal networks through which Win32/Delf.NLT Trojans are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a repercussion of user winding up on a resource that organizes a malicious software application;

As quickly as the Trojan is effectively infused, it will either cipher the information on the sufferer’s computer or protect against the device from working in a correct fashion – while additionally positioning a ransom note that mentions the need for the victims to effect the payment for the purpose of decrypting the papers or recovering the documents system back to the initial condition. In the majority of circumstances, the ransom note will come up when the customer restarts the COMPUTER after the system has actually already been damaged.

Win32/Delf.NLT circulation channels.

In various edges of the globe, Win32/Delf.NLT grows by leaps and bounds. Nevertheless, the ransom notes and techniques of extorting the ransom quantity might differ relying on certain neighborhood (local) settings. The ransom money notes as well as techniques of obtaining the ransom quantity may differ depending on particular neighborhood (regional) setups.

Ransomware injection

As an example:

    Faulty informs concerning unlicensed software application.

    In specific locations, the Trojans commonly wrongfully report having detected some unlicensed applications allowed on the target’s device. The alert then demands the individual to pay the ransom.

    Faulty statements concerning prohibited web content.

    In countries where software piracy is less preferred, this approach is not as reliable for the cyber frauds. Additionally, the Win32/Delf.NLT popup alert may incorrectly declare to be originating from a police establishment and will certainly report having located youngster pornography or various other unlawful information on the tool.

    Win32/Delf.NLT popup alert might wrongly declare to be deriving from a legislation enforcement organization as well as will report having situated kid porn or various other illegal data on the gadget. The alert will in a similar way have a need for the user to pay the ransom.

Technical details

File Info:

crc32: 4CD21638
md5: a57d87b1c8bb885ae3d95e7a2e1b956d
name: A57D87B1C8BB885AE3D95E7A2E1B956D.mlw
sha1: 9a960552b64ff5642d017c4fb90a96cc8558dc4c
sha256: 9e6a1b779bf86a9d7da07792fcbce5588a6ea69b1a26639a820548a856d9c4ef
sha512: 411122e16fad2a107502cd11c1247e2900e81c5a984d9baa614dd2bd85c065f43f274580f8d816eb5af41978a1d95db1ae07d5a9d3602a4fbfc92ea0d7b741be
ssdeep: 6144:jx7DbYTRT9LNw9zcGJFelnblbDPQ/EZUYvF+2cOMHAohX/tcfQ3gcPhThtvU+nC:jtYTLiZhJFelnbdv7MHQQwA5hC6symk
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Delf.NLT also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.RaisetadLTC.Trojan
K7AntiVirus Trojan ( 7000000f1 )
MicroWorld-eScan Trojan.GenericKD.30645325
CAT-QuickHeal Backdoor.Aybo
ALYac Trojan.GenericKD.30645325
CrowdStrike win/malicious_confidence_100% (W)
K7GW Trojan ( 7000000f1 )
Cybereason malicious.1c8bb8
NANO-Antivirus Trojan.Win32.Blocker.falwin
Cyren W32/Trojan.BFJT-6775
ESET-NOD32 a variant of Win32/Delf.NLT
Avast Win32:Agent-AYHI [Trj]
Kaspersky Trojan-Ransom.Win32.Blocker.kytl
BitDefender Trojan.GenericKD.30645325
ViRobot Trojan.Win32.S.Agent.483328.KQ
Tencent Win32.Trojan.Blocker.Lmav
Ad-Aware Trojan.GenericKD.30645325
Sophos Mal/Generic-S
Comodo Malware@#cvym2u9aw3m
F-Secure Trojan.TR/Dldr.Delphi.Gen
DrWeb Trojan.PWS.Banks.652
Emsisoft Trojan.GenericKD.30645325 (B)
SentinelOne DFI – Malicious PE
GData Trojan.GenericKD.30645325
Endgame malicious (high confidence)
Avira TR/Dldr.Delphi.Gen
Antiy-AVL Trojan/Win32.TSGeneric
Microsoft Backdoor:Win32/Aybo.B
Arcabit Trojan.Generic.D1D39C4D
ZoneAlarm Trojan-Ransom.Win32.Blocker.kytl
TACHYON Ransom/W32.DP-Blocker.483328
AhnLab-V3 Malware/Win32.Generic.C2501887
Acronis suspicious
McAfee GenericRXGZ-RI!A57D87B1C8BB
MAX malware (ai score=100)
VBA32 Trojan.PSW
Panda Trj/GdSda.A
TrendMicro-HouseCall TROJ_AYBO.SM
Rising Ransom.Blocker!8.12A (CLOUD)
Yandex Trojan.Blocker!zRtSQS0IDRs
Ikarus Worm.Win32.Delf
Fortinet W32/Blocker.KYTL!tr
AVG Win32:Agent-AYHI [Trj]
Qihoo-360 Win32/Trojan.Ransom.1bb

How to remove Win32/Delf.NLT 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/Delf.NLT 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.NLT 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

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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