Written by Robert Bailey

What is TrojanDownloader:Win32/Cutwail.BT infection?

In this post you will find regarding the definition of TrojanDownloader:Win32/Cutwail.BT and its adverse impact on your computer. Such ransomware are a kind of malware that is specified by online fraudulences to demand paying the ransom money by a sufferer.

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Most of the situations, TrojanDownloader:Win32/Cutwail.BT ransomware will instruct its sufferers to initiate funds move for the function of reducing the effects of the changes that the Trojan infection has introduced to the target’s gadget.

TrojanDownloader:Win32/Cutwail.BT Summary

These adjustments can be as complies with:

  • 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.
  • Presents an Authenticode digital signature;
  • 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.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • 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 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 sufferer’s hard disk — so the sufferer can no longer make use of the information;
  • Preventing normal 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.

Related domains: Ransom.Agent.Generic


One of the most regular channels where TrojanDownloader:Win32/Cutwail.BT are infused are:

  • By methods of phishing emails;
  • As a repercussion of customer ending up on a resource that hosts a harmful software application;

As quickly as the Trojan is effectively injected, it will certainly either cipher the information on the victim’s PC or prevent the gadget from functioning in an appropriate fashion – while also placing a ransom note that points out the need for the targets to impact the payment for the objective of decrypting the files or restoring the documents system back to the initial condition. In a lot of instances, the ransom note will come up when the customer reboots the COMPUTER after the system has actually already been damaged.

TrojanDownloader:Win32/Cutwail.BT circulation networks.

In various corners of the globe, TrojanDownloader:Win32/Cutwail.BT grows by jumps and bounds. Nonetheless, the ransom notes and methods of obtaining the ransom quantity may vary depending on specific local (regional) settings. The ransom notes and methods of extorting the ransom quantity may vary depending on specific local (regional) settings.

Ransomware injection

As an example:

    Faulty signals about unlicensed software.

    In specific areas, the Trojans usually wrongfully report having discovered some unlicensed applications allowed on the victim’s tool. The alert then requires the customer to pay the ransom.

    Faulty declarations about prohibited material.

    In nations where software program piracy is much less preferred, this technique is not as effective for the cyber scams. Alternatively, the TrojanDownloader:Win32/Cutwail.BT popup alert may wrongly assert to be stemming from a law enforcement organization and also will certainly report having situated kid pornography or other prohibited information on the gadget.

    TrojanDownloader:Win32/Cutwail.BT popup alert might wrongly declare to be deriving from a legislation enforcement institution as well as will certainly report having located kid porn or various other prohibited data on the gadget. The alert will likewise include a demand for the user to pay the ransom.

Technical details

File Info:

crc32: 491104B8
md5: 0b7b2f450c91233913adbe119eb0c354
name: 0B7B2F450C91233913ADBE119EB0C354.mlw
sha1: 87acaf5833a8c42476d1801ce8f83d7a8675a567
sha256: f8f32273dc61db9a1140684be611167f9c7cab9dcb4207e504e205c5c3d10d13
sha512: 515938294d92793e1c9909071e820c38a1260f4a3c8c9c39b5fe2d83e496504c8f83baacb9c9537221533614a137655a0fe1bef1457f97d6ce8cb8041861d0c6
ssdeep: 384:hukPud1HaGIe9moa1sUl/dk5wU8Ggtah91Mcn+4H837Qi95IR+QJ:c4uLE1s2iGhah9tE7l95IR+W
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

TrojanDownloader:Win32/Cutwail.BT also known as:

GridinSoft Trojan.Ransom.Gen
Elastic malicious (high confidence)
MicroWorld-eScan Gen:Trojan.Heur.JP.buX@auWc7Vci
McAfee Downloader-FAKG!0B7B2F450C91
Cylance Unsafe
AegisLab Trojan.Win32.Generic.lrhh
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (D)
BitDefender Gen:Trojan.Heur.JP.buX@auWc7Vci
Symantec ML.Attribute.HighConfidence
APEX Malicious
Avast Win32:Dropper-gen [Drp]
Kaspersky HEUR:Trojan.Win32.Generic
NANO-Antivirus Trojan.Win32.Bulknet.vktrc
ViRobot Trojan.Win32.Jorik.20920
Rising Downloader.Cutwail!8.670 (TFE:4:myXta1v8RrE)
Ad-Aware Gen:Trojan.Heur.JP.buX@auWc7Vci
Sophos Mal/Generic-S
Comodo TrojWare.Win32.Kryptik.AIJE@4q3exi
F-Secure Trojan.TR/Crypt.XPACK.Gen
DrWeb BackDoor.Bulknet.546
Zillya Trojan.Jorik.Win32.114031
TrendMicro Mal_Pushdo-1
McAfee-GW-Edition Downloader-FAKG!0B7B2F450C91
Emsisoft Gen:Trojan.Heur.JP.buX@auWc7Vci (B)
Ikarus Trojan.Win32.Jorik
Jiangmin Trojan/Jorik.eebp
MaxSecure Trojan.Malware.300983.susgen
Avira TR/Crypt.XPACK.Gen
MAX malware (ai score=84)
Antiy-AVL Trojan/Win32.Totem
Kingsoft Win32.Troj.Jorik.rm.(kcloud)
Microsoft TrojanDownloader:Win32/Cutwail.BT
Arcabit Trojan.Heur.JP.EFC475
SUPERAntiSpyware Trojan.Agent/Gen-Jorik
ZoneAlarm HEUR:Trojan.Win32.Generic
GData Gen:Trojan.Heur.JP.buX@auWc7Vci
Cynet Malicious (score: 100)
AhnLab-V3 Trojan/Win32.Jorik.R32442
Acronis suspicious
BitDefenderTheta AI:Packer.8265A3B61F
ALYac Gen:Trojan.Heur.JP.buX@auWc7Vci
TACHYON Trojan/W32.Jorik.20992.B
VBA32 Trojan.Totem
Malwarebytes Ransom.Agent.Generic
Panda Generic Malware
ESET-NOD32 a variant of Win32/Kryptik.AHXV
TrendMicro-HouseCall Mal_Pushdo-1
Tencent Malware.Win32.Gencirc.114b55af
Yandex Trojan.GenAsa!bGxqFxm3ZiY
SentinelOne Static AI – Suspicious PE
Fortinet W32/CutMail.EE!tr
Webroot W32.Rogue.Gen
AVG Win32:Dropper-gen [Drp]
Cybereason malicious.50c912
Qihoo-360 HEUR/Malware.QVM19.Gen

How to remove TrojanDownloader:Win32/Cutwail.BT 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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The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

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.

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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 TrojanDownloader:Win32/Cutwail.BT 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 TrojanDownloader:Win32/Cutwail.BT 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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