Written by Robert Bailey

What is Trojan-Ransom.Win32.Cryptodef.abk infection?

In this short article you will find about the interpretation of Trojan-Ransom.Win32.Cryptodef.abk as well as its negative impact on your computer system. Such ransomware are a type of malware that is specified by on the internet scams to demand paying the ransom money by a target.

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Most of the situations, Trojan-Ransom.Win32.Cryptodef.abk virus will certainly advise its targets to initiate funds move for the purpose of neutralizing the changes that the Trojan infection has introduced to the sufferer’s device.

Trojan-Ransom.Win32.Cryptodef.abk 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 with CreateRemoteThread in a remote process;
  • Mimics the system’s user agent string for its own requests;
  • 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.
  • Uses Windows utilities for basic functionality;
  • Attempts to delete volume shadow copies;
  • Attempts to stop active services;
  • Modifies boot configuration settings;
  • Behavior consistent with a dropper attempting to download the next stage.;
  • 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.
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • 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.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the papers situated on the victim’s hard disk — so the victim can no longer utilize the data;
  • Preventing regular access 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.


The most typical channels whereby Trojan-Ransom.Win32.Cryptodef.abk 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 an effect of customer winding up on a source that organizes a harmful software program;

As soon as the Trojan is efficiently infused, it will either cipher the information on the victim’s computer or protect against the gadget from operating in a correct fashion – while likewise putting a ransom note that states the need for the victims to effect the settlement for the purpose of decrypting the papers or restoring the file system back to the initial condition. In a lot of circumstances, the ransom note will certainly show up when the customer reboots the PC after the system has actually already been harmed.

Trojan-Ransom.Win32.Cryptodef.abk distribution channels.

In various corners of the world, Trojan-Ransom.Win32.Cryptodef.abk expands by jumps and bounds. Nevertheless, the ransom notes and also tricks of obtaining the ransom quantity may differ relying on particular local (local) settings. The ransom notes and also techniques of extorting the ransom amount might vary depending on certain regional (regional) settings.

Ransomware injection

As an example:

    Faulty alerts about unlicensed software program.

    In specific locations, the Trojans commonly wrongfully report having actually spotted some unlicensed applications enabled on the sufferer’s gadget. The sharp then demands the individual to pay the ransom.

    Faulty statements about prohibited material.

    In nations where software program piracy is less popular, this approach is not as effective for the cyber fraudulences. Additionally, the Trojan-Ransom.Win32.Cryptodef.abk popup alert may wrongly declare to be deriving from a law enforcement establishment as well as will certainly report having located child porn or other illegal data on the gadget.

    Trojan-Ransom.Win32.Cryptodef.abk popup alert might wrongly claim to be deriving from a legislation enforcement institution as well as will report having located youngster porn or various other illegal data on the tool. The alert will likewise include a need for the individual to pay the ransom.

Technical details

File Info:

crc32: A404D4B1
md5: 546fd0d0dfa1ba77027f1e10b35b5adb
name: 546FD0D0DFA1BA77027F1E10B35B5ADB.mlw
sha1: 49f037832681d4271fa4687b105515f762cb234e
sha256: 4c5cdf14bb3e1fd93fdb12dfaebcec8fdfb6bbeb578673984bd81294dfa69f7d
sha512: 92252a4fb85aabc4043323127cf3844f7c3679d3654d5b5ecec5f15a745289e86fce097056efc7d8527eee9be6f436770ebac5f9b5f7628363a2a3aeb0c41881
ssdeep: 1536:mxMj3SM18/BzxGb9M/PoBKKcw8twYzThlkGs3hZZ2ROa2rH71hTv43ihAw6zd:mxmik8p1GwNKB8twKhlAxudyb1hTgyf
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

CompanyName: Mesu Corp.
Translation: 0x0410 0x0409

Trojan-Ransom.Win32.Cryptodef.abk also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 00498ab51 )
Elastic malicious (high confidence)
TotalDefense Win32/Ransom.RFVJASC
CAT-QuickHeal TrojanPWS.Kegotip.WR4
ALYac Trojan.Dyreza.Gen.3
Zillya Trojan.Cryptodef.Win32.179
CrowdStrike win/malicious_confidence_100% (D)
Alibaba TrojanDropper:Win32/dropper.ali1003001
K7GW Trojan ( 00498ab51 )
Cybereason malicious.0dfa1b
BitDefenderTheta Gen:NN.ZexaF.34628.kq0@aGBrTKci
Cyren W32/Trojan.BHEV-4143
Symantec Downloader.Upatre!gen5
ESET-NOD32 Win32/Filecoder.CryptoWall.A
APEX Malicious
Avast Win32:Malware-gen
Cynet Malicious (score: 100)
Kaspersky Trojan-Ransom.Win32.Cryptodef.abk
BitDefender Trojan.Dyreza.Gen.3
NANO-Antivirus Trojan.Win32.Cryptodef.ddzhcy
MicroWorld-eScan Trojan.Dyreza.Gen.3
Tencent Win32.Trojan.Bp-generic.Wpav
Ad-Aware Trojan.Dyreza.Gen.3
Comodo Malware@#2jm8kn74d1ddr
DrWeb Trojan.Encoder.514
VIPRE Win32.Malware!Drop
Sophos Mal/Generic-R + Mal/Zbot-QL
Jiangmin Trojan/Cryptodef.aj
Webroot W32.Cryptodef
Avira TR/Crypt.ZPACK.Gen4
Kingsoft Win32.Troj.Undef.(kcloud)
GData Trojan.Dyreza.Gen.3
AhnLab-V3 Trojan/Win32.MDA.C506071
VBA32 Hoax.Cryptodef
MAX malware (ai score=100)
Panda Trj/Genetic.gen
TrendMicro-HouseCall TROJ_CRYPWALL.G
Rising Ransom.Cryptodef!8.672 (CLOUD)
SentinelOne Static AI – Malicious PE
eGambit Generic.Malware
Fortinet W32/Kryptik.GKA!tr
AVG Win32:Malware-gen
Qihoo-360 Win32/Ransom.Cryptodef.HwcBip8A

How to remove Trojan-Ransom.Win32.Cryptodef.abk 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 Trojan-Ransom.Win32.Cryptodef.abk 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-Ransom.Win32.Cryptodef.abk 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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