Win32/Tofsee.BJ

Written by Robert Bailey

What is Win32/Tofsee.BJ infection?

In this article you will locate concerning the meaning of Win32/Tofsee.BJ and also its negative effect on your computer. Such ransomware are a kind of malware that is specified by on-line frauds to demand paying the ransom money by a target.

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Most of the cases, Win32/Tofsee.BJ infection will certainly instruct its victims to launch funds transfer for the function of counteracting the changes that the Trojan infection has actually presented to the victim’s device.

Win32/Tofsee.BJ Summary

These alterations can be as follows:

  • 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 (Process Hollowing);
  • Attempts to connect to a dead IP:Port (3 unique times);
  • 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.
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • 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.
  • 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;
  • Enumerates services, possibly for anti-virtualization;
  • Executed a process and injected code into it, probably while unpacking;
  • 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
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the files situated on the victim’s hard 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.
Similar behavior
Related domains
z.whorecord.xyz Ransom-Locky!C23696B4C3F8
a.tomx.xyz Ransom-Locky!C23696B4C3F8
microsoft-com.mail.protection.outlook.com Ransom-Locky!C23696B4C3F8

Win32/Tofsee.BJ

The most common channels where Win32/Tofsee.BJ Ransomware Trojans are infused are:

  • By ways of phishing e-mails;
  • As a consequence of user ending up on a resource that hosts a malicious software application;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the data on the victim’s computer or stop the gadget from operating in a proper manner – while also placing a ransom money note that states the need for the targets to impact the repayment for the objective of decrypting the papers or recovering the data system back to the first problem. In many circumstances, the ransom money note will show up when the customer reboots the PC after the system has actually currently been damaged.

Win32/Tofsee.BJ circulation networks.

In numerous corners of the world, Win32/Tofsee.BJ grows by jumps and bounds. Nevertheless, the ransom notes as well as techniques of extorting the ransom quantity might vary depending upon particular regional (local) setups. The ransom money notes as well as tricks of obtaining the ransom money quantity may vary depending on certain local (regional) setups.

Ransomware injection

For instance:

    Faulty alerts regarding unlicensed software.

    In particular areas, the Trojans usually wrongfully report having spotted some unlicensed applications enabled on the target’s gadget. The sharp then requires the user to pay the ransom money.

    Faulty declarations regarding illegal content.

    In nations where software program piracy is much less preferred, this method is not as efficient for the cyber frauds. Additionally, the Win32/Tofsee.BJ popup alert might falsely claim to be stemming from a police establishment as well as will report having located youngster pornography or various other prohibited information on the gadget.

    Win32/Tofsee.BJ popup alert may incorrectly assert to be acquiring from a law enforcement institution as well as will report having situated kid pornography or various other prohibited information on the gadget. The alert will likewise contain a requirement for the customer to pay the ransom money.

Technical details

File Info:

crc32: 8A359C80
md5: c23696b4c3f8fb7060e3c9b8a8f3a532
name: upload_file
sha1: 8d1d0f8035457831c3e1ea3b346dcfe0d2d9de6c
sha256: 74c89992679bd6647c1e1045b5e0e7f4fc915b5594d02f48efece04930b73a69
sha512: 0a487367252a6ea44ae282fb5be6596a197ad60841943ecd7ccba8902af914b6d17218b67a0dd251ddf242e05998a3b651b93430ee238cbcb5b7ef78b5f01720
ssdeep: 196608:3OBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBS:3OBBBBBBBBBBBBBBBBBBBBBBBBBBBBBS
type: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows

Version Info:

0: [No Data]

Win32/Tofsee.BJ also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Trojan.GenericKDZ.40568
FireEye Generic.mg.c23696b4c3f8fb70
CAT-QuickHeal Backdoor.Tofsee
McAfee Ransom-Locky!C23696B4C3F8
Cylance Unsafe
AegisLab Trojan.Win32.Tofsee.m!c
Sangfor Malware
K7AntiVirus Trojan ( 0051918c1 )
BitDefender Trojan.GenericKDZ.40568
K7GW Trojan ( 00517c911 )
CrowdStrike win/malicious_confidence_100% (W)
Cyren W32/S-40d98854!Eldorado
Symantec Packed.Generic.493
APEX Malicious
Paloalto generic.ml
ClamAV Win.Malware.Locky-7090183-0
Kaspersky HEUR:Backdoor.Win32.Tofsee.vho
Alibaba Backdoor:Win32/Tofsee.8c63ad39
NANO-Antivirus Trojan.Win32.Tofsee.esxpvm
ViRobot Trojan.Win32.Z.Tofsee.12154944
Rising Trojan.Kryptik!1.AE8C (CLASSIC)
Ad-Aware Trojan.GenericKDZ.40568
Comodo TrojWare.Win32.Tofsee.BJ@79g6sc
VIPRE Trojan.Win32.Generic!BT
Invincea ML/PE-A + Mal/Elenoocka-E
McAfee-GW-Edition BehavesLike.Win32.Backdoor.wc
Sophos Mal/Elenoocka-E
Ikarus Trojan-Ransom.Locky
Jiangmin Backdoor.Poison.aus
Webroot W32.Trojan.Gen
Avira TR/Crypt.ZPACK.Gen4
MAX malware (ai score=87)
Microsoft Backdoor:Win32/Tofsee.T
Arcabit Trojan.Generic.D9E78
ZoneAlarm HEUR:Backdoor.Win32.Tofsee.vho
GData Trojan.GenericKDZ.40568
AhnLab-V3 Win-Trojan/RansomCrypt.Exp
Acronis suspicious
BitDefenderTheta Gen:NN.ZexaF.34590.@tX@a0BBRxj
ALYac Trojan.GenericKDZ.40568
VBA32 Trojan.FakeAV.01657
ESET-NOD32 Win32/Tofsee.BJ
Tencent Malware.Win32.Gencirc.10bab530
Yandex Trojan.GenAsa!Fu9t/cpFyIE
SentinelOne DFI – Malicious PE
eGambit Unsafe.AI_Score_85%
Fortinet W32/Kryptik.GKVH!tr
AVG Win32:Malware-gen
Cybereason malicious.4c3f8f
Avast Win32:Malware-gen
Qihoo-360 Win32/Backdoor.3ba

How to remove Win32/Tofsee.BJ ransomware?

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

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.

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/Tofsee.BJ 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

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If the guide doesn’t help you to remove Win32/Tofsee.BJ you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/products/

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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