Threat Database Trojans Trojan.Vidar.FD

Trojan.Vidar.FD

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 14
First Seen: November 26, 2025
Last Seen: January 16, 2026
OS(es) Affected: Windows

The detection of Trojan.Vidar.FD on your system indicates a potential security threat that requires immediate attention. This report aims to provide you with a comprehensive understanding of the threat, its operational methods, symptoms of infection, and most importantly, steps to remove it from your system.

What Is Trojan.Vidar.FD?

Trojan.Vidar.FD is identified as a Trojan-type threat, which means it is a type of malware that disguises itself as a legitimate program to gain unauthorized access to a computer system. Trojans can cause significant harm by allowing hackers to access sensitive information, disrupt system operations, or even use the infected computer as a hub for spreading malware to other systems. The name itself does not directly indicate a specific malware family, but its categorization as a Trojan highlights its potential to cause harm by deception.

How Trojan.Vidar.FD Operates

Typically, Trojans like Trojan.Vidar.FD operate by exploiting vulnerabilities in system security or by deceiving users into installing them. Once installed, they can create backdoors for remote access, allowing attackers to steal data, install additional malware, or use the system for malicious activities. The exact mechanisms of Trojan.Vidar.FD might vary, but its primary goal is to compromise system security without being detected.

Symptoms of Infection

Symptoms of a Trojan infection can be subtle and may not always be immediately apparent. Common indicators include unusual system behavior, such as slow performance, frequent crashes, or unfamiliar programs and icons appearing on the desktop. Additionally, if you notice that your personal files are being encrypted without your action, or if you receive ransom demands, it could be a sign of a Trojan infection. Monitoring your system for any unusual activity and being cautious with emails and downloads is crucial in preventing and identifying such threats.

How to Remove Trojan.Vidar.FD

  1. Boot into Safe Mode with Networking: This will allow you to use the internet while minimizing the risk of the malware interfering with your removal efforts. To do this, restart your computer and press the key to access your boot menu (this key varies by manufacturer but is often F12, F2, or Del). Select the option to boot into Safe Mode with Networking.
  2. Perform a Full Scan with a Reputable Tool: Utilize a reputable anti-malware tool, such as SpyHunter, to conduct a full scan of your system. This can help identify and remove the Trojan and any other malware that might be present.
  3. Uninstall Suspicious Programs: Go through your installed programs and uninstall any that you do not recognize or that were installed around the time your system became infected.
  4. Reset Your Browser Settings: If your browsers (such as Chrome, Firefox, or Edge) have been affected, resetting them to their default settings can help remove any malicious extensions or settings that the Trojan might have installed.
  5. Reboot and Re-scan: After taking the above steps, restart your computer in normal mode and perform another scan with your anti-malware tool to ensure that the threat has been fully removed.

Conclusion

Removing Trojan.Vidar.FD requires a systematic approach to ensure that all components of the malware are eliminated from your system. By following the steps outlined above and maintaining vigilance in your online activities, you can protect your system from similar threats in the future. Regularly updating your operating system, using strong antivirus software, and being cautious with emails and downloads are key practices in preventing malware infections. If you are unsure about any part of the removal process, it may be beneficial to consult with a professional to ensure your system is completely secure.

Analysis Report

General information

Family Name: Trojan.Vidar.FD
Packers: UPX x64
Signature status: No Signature

Known Samples

MD5: 8993974bb09d9302ea49e1dc4ab2d655
SHA1: 4926362b21b7b7eef93d0f48e0b20761e0f60ace
SHA256: 94D0D09187482F8BE7308063AC67BB405ACCEFC19B664AAD8428E6CCEE115BF8
File Size: 588.29 KB, 588288 bytes
MD5: 4d3adf17e82e67beb18f9b7aa1af31e2
SHA1: e977c7029b302c2d815b1a17c16f7ba08a982538
SHA256: 45E669D8C1E74EF3BE62D28534425567F448BC573F4EC86E3792AE80B6A1795D
File Size: 588.29 KB, 588288 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File doesn't have exports table
  • File doesn't have relocations information
  • File doesn't have security information
  • File has been packed
  • File is 64-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is Native application (NOT .NET application)
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  • IMAGE_FILE_DLL is not set inside PE header (Executable)
  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Traits

  • CryptUnprotectData
  • HighEntropy
  • No CryptProtectData
  • No Version Info
  • packed
  • VirtualQueryEx
  • WriteProcessMemory
  • x64

Block Information

Total Blocks: 325
Potentially Malicious Blocks: 320
Whitelisted Blocks: 5
Unknown Blocks: 0

Visual Map

x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 0 x x x x x x x x x x x x x 0 x x x 0 x 0 x x 0 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • Vidar.FD

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • UNKNOWN

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