Malicious Firmware Pushed via TFTP to Device

Darshan Thummar@Mighty

•updated Jun 12, 2026•0•0•6

This rule detects attempts to push malicious firmware to a device via TFTP (Trivial File Transfer Protocol). It specifically looks for UDP traffic on port 69 (TFTP) where the packet content starts with "|00 02|" (indicating a TFTP write request) and the data size is greater than 10000 bytes, suggesting a firmware image transfer.