alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO BusyBox Banner Observed"; flow:established,to_client; content:"busybox v"; fast_pattern; nocase; pcre:"/^.*(?:multi-call\x20binary|built-in\x20shell)?/R"; reference:url,busybox.net; classtype:misc-activity; sid:2064198; rev:1; metadata:affected_product Any, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_08_28, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_08_28; target:src_ip;)