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[SECURITY] Notepad++ File Detected as Trojan by Multiple AV Vendors #16779

@FakeRN45

Description

@FakeRN45

Is there an existing issue for this?

  • I have searched the existing issues

Description of the Issue

Dear Notepad++ Developers,

I would like to report that the official Notepad++ release downloaded from the official site https://notepad-plus-plus.org appears to be flagged as malicious by multiple antivirus vendors.

File Information:

VirusTotal Report
https://www.virustotal.com/gui/file/49852273a3e98ad1266a5bb7cd056e1154cc6d14e7c2a6e308ae95f355ca10cf

  • Detection Highlights:
    • Cynet: Malicious (score: 99)
    • GData: Win64.Trojan.Agent.WKXD0U
    • Trellix ENS: Artemis!26B9167CC026
    • Fortinet: W32/PossibleThreat
    • MaxSecure: Trojan.Malware.susgen
    • DeepInstinct: MALICIOUS

Please verify the integrity of the file, and if confirmed safe, consider reporting a false positive to antivirus vendors.

Best regards,
Aldrian Firmansyah Putranto
Cyber Threat Hunting

Steps To Reproduce

  1. Go to https://notepad-plus-plus.org/
  2. Download the official Notepad++ installer (npp.8.8.2.Installer.x64.exe)
  3. Run sha256sum on the file to verify its SHA-256 hash
  4. Result: 49852273a3e98ad1266a5bb7cd056e1154cc6d14e7c2a6e308ae95f355ca10cf
  5. Upload the hash to https://www.virustotal.com/
  6. Observe that multiple antivirus vendors detect the file as malicious

Current Behavior

The installer file downloaded from the official Notepad++ website is detected as malware/trojan by multiple antivirus engines on VirusTotal, including Fortinet, Cynet, GData, Trellix, and others.

Expected Behavior

The official Notepad++ installer should not be detected as malicious by any reputable antivirus engine, assuming it is clean and unmodified.

Debug Information

- Operating System used for verification: Kali Linux (latest)
- Tool used: sha256sum, VirusTotal
- SHA-256: 49852273a3e98ad1266a5bb7cd056e1154cc6d14e7c2a6e308ae95f355ca10cf
- VirusTotal link: https://www.virustotal.com/gui/file/49852273a3e98ad1266a5bb7cd056e1154cc6d14e7c2a6e308ae95f355ca10cf

Anything else?

This detection may be due to:

  • A possible supply chain compromise
  • A malicious file uploaded by a third party
  • Or a rare widespread false positive across multiple AV engines

Please investigate this as a high-priority security concern. I am available to provide the sample or any other forensic data needed.

Thank you for your dedication to open-source software and security.

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