Ransomware SMB File Encryption Pattern

Darshan Thummar@Mighty

•updated Jun 10, 2026•0•0•2

This rule detects a pattern indicative of ransomware encrypting files over SMB. It specifically looks for TCP traffic on port 445 (SMB) within the home network, containing the byte sequence '|FF|SMB'. A threshold of 500 such events from a single source IP within 30 seconds triggers the alert, classifying it as trojan activity.