Backdoor:Win32/Tofsee.T

Written by Robert Bailey

What is Backdoor:Win32/Tofsee.T infection?

In this post you will discover concerning the interpretation of Backdoor:Win32/Tofsee.T as well as its negative influence on your computer. Such ransomware are a form of malware that is specified by on-line scams to require paying the ransom money by a sufferer.

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In the majority of the instances, Backdoor:Win32/Tofsee.T infection will certainly advise its targets to start funds transfer for the function of counteracting the amendments that the Trojan infection has presented to the victim’s device.

Backdoor:Win32/Tofsee.T 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 (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 documents situated on the sufferer’s hard drive — so the victim can no longer use the information;
  • Preventing normal access 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
microsoft-com.mail.protection.outlook.com Ransom-Locky!CF06B862C303

Backdoor:Win32/Tofsee.T

The most regular networks through which Backdoor:Win32/Tofsee.T Ransomware 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 consequence of user ending up on a resource that hosts a destructive software;

As soon as the Trojan is successfully injected, it will either cipher the data on the sufferer’s computer or stop the tool from operating in an appropriate way – while likewise positioning a ransom money note that states the demand for the victims to impact the settlement for the function of decrypting the files or recovering the documents system back to the preliminary problem. In most circumstances, the ransom money note will certainly come up when the customer reboots the COMPUTER after the system has actually currently been harmed.

Backdoor:Win32/Tofsee.T circulation networks.

In numerous corners of the globe, Backdoor:Win32/Tofsee.T grows by leaps and bounds. However, the ransom notes and methods of obtaining the ransom money amount might differ depending on certain local (local) settings. The ransom money notes and also methods of obtaining the ransom money amount may vary depending on certain local (local) settings.

Ransomware injection

For instance:

    Faulty notifies about unlicensed software application.

    In specific locations, the Trojans typically wrongfully report having discovered some unlicensed applications enabled on the victim’s tool. The sharp then requires the user to pay the ransom.

    Faulty declarations about prohibited content.

    In nations where software piracy is less popular, this technique is not as reliable for the cyber scams. Additionally, the Backdoor:Win32/Tofsee.T popup alert may falsely declare to be originating from a law enforcement organization and also will report having located youngster porn or other unlawful information on the tool.

    Backdoor:Win32/Tofsee.T popup alert might wrongly declare to be acquiring from a legislation enforcement institution and will report having located child porn or various other illegal data on the tool. The alert will likewise consist of a requirement for the user to pay the ransom money.

Technical details

File Info:

crc32: 8A983CFB
md5: cf06b862c3034e99c47d5366e8af419d
name: upload_file
sha1: 626b5994adb359d8322ae06120b383c234f75bc4
sha256: 2cbf954b0d13991ffb59779986bc5253abbdb24911d3f1b60f84759d682c5f90
sha512: 4349085c9db25cffa019d7043353ff8e3d772483b271412dec150b2e3954e730c4dc553869d4b4d576c9b3c90b04a476b73643059460b5415fb903a538ca4f04
ssdeep: 49152:N77777777777777777777777777777777777777777777777777777777777777:
type: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows

Version Info:

0: [No Data]

Backdoor:Win32/Tofsee.T also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Trojan.GenericKDZ.40579
McAfee Ransom-Locky!CF06B862C303
Cylance Unsafe
Zillya Trojan.Agent.Win32.1350246
Sangfor Malware
K7AntiVirus Trojan ( 0051918c1 )
BitDefender Trojan.GenericKDZ.40579
K7GW Trojan ( 0051785e1 )
Cybereason malicious.2c3034
Invincea ML/PE-A + Mal/Elenoocka-G
BitDefenderTheta Gen:NN.ZexaF.34570.@tW@aGlvLXd
Cyren W32/S-721a11f7!Eldorado
Symantec Packed.Generic.493
APEX Malicious
ClamAV Win.Ransomware.Locky-7352150-0
Kaspersky HEUR:Trojan-Dropper.Win32.Agent.pef
NANO-Antivirus Trojan.Win32.Kryptik.gdpioz
Tencent Malware.Win32.Gencirc.10bac7d4
Ad-Aware Trojan.GenericKDZ.40579
Sophos Mal/Elenoocka-G
Comodo TrojWare.Win32.Crypt.C@7vajd0
F-Secure Heuristic.HEUR/AGEN.1120889
DrWeb Trojan.Siggen10.36945
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_CERBER.SMALY0
McAfee-GW-Edition BehavesLike.Win32.Ransomware.wc
Emsisoft Trojan-Ransom.Locky (A)
Ikarus Trojan-Ransom.Locky
Jiangmin Backdoor.Poison.aum
Avira HEUR/AGEN.1120889
MAX malware (ai score=87)
Antiy-AVL Trojan/Win32.TSGeneric
Microsoft Backdoor:Win32/Tofsee.T
ZoneAlarm HEUR:Trojan-Dropper.Win32.Agent.pef
GData Win32.Backdoor.Tofsee.138PUK
Cynet Malicious (score: 100)
AhnLab-V3 Win-Trojan/RansomCrypt.Exp
Acronis suspicious
VBA32 Trojan.FakeAV.01657
ALYac Trojan.GenericKDZ.40579
Malwarebytes Trojan.MalPack
ESET-NOD32 a variant of Win32/Kryptik.FWWH
TrendMicro-HouseCall Ransom_CERBER.SMALY0
Rising Trojan.Kryptik!1.AE8C (CLASSIC)
SentinelOne DFI – Suspicious PE
eGambit Unsafe.AI_Score_77%
Fortinet W32/Kryptik.GKVH!tr
CrowdStrike win/malicious_confidence_100% (D)
Qihoo-360 Win32/Trojan.Dropper.42f

How to remove Backdoor:Win32/Tofsee.T 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 Backdoor:Win32/Tofsee.T 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 Backdoor:Win32/Tofsee.T 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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