NPPSPY

MITRE ATT&CK: S1131 View on attack.mitre.org

Aliases: NPPSPY

Malware type
credential-stealer, spyware
Operating systems
windows
Profile updated
2026-07-07 15:33:28

Context

NPPSPY is an implementation of a theoretical mechanism first presented in 2004 for capturing credentials submitted to a Windows system via a rogue Network Provider API item. NPPSPY captures credentials following submission and writes them to a file on the victim system for follow-on exfiltration.

Detection coverage

  • 1 YARA rules
  • 117 Sigma rules

Malware & tools used

  • Impersonation (attack-pattern)
  • Modify Registry (attack-pattern)
  • Data from Local System (attack-pattern)
  • Adversary-in-the-Middle (attack-pattern)
  • Unsecured Credentials (attack-pattern)
  • Input Capture (attack-pattern)
  • Automated Collection (attack-pattern)

Detection rules

  • DITEKSHEN_MALWARE_Win_Nppspy (yara-rule)

Reports & references

  • MITRE ATT&CK — S1131 (report)
  • blackhat.com — Bh Win 04 Polak2 (report)
  • huntress.com — Cleartext Shenanigans Gifting User Passwords To Adversaries With Nppspy (report)

External references