Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule monitors network device audit logs for suspicious activities that indicate potential persistence or defense evasion on edge/VPN/router appliances. It specifically flags configuration changes, creation of new administrative accounts, addition of unauthorized SSH keys, and the disabling of logging/syslog export, which are common tactics for maintainig unauthorized access on network infrastructure.
This rule detects potential modification of a network device's system image via TFTP. It specifically looks for UDP traffic on port 69 (TFTP) where the packet size is greater than 50000 bytes and contains the byte sequence "|00 02|" at a depth of 2 bytes, which is indicative of a TFTP write request (opcode 2). The large packet size suggests a system image transfer.
