alert smb $HOME_NET any -> any any (msg:"ET INFO SMBv2 Protocol Cancel Operation Observed"; flow:established,to_server; content:"|fe|SMB"; depth:8; byte_test:1,=,0x0c,8,relative; threshold:type limit, count 1, seconds 300, track by_src; reference:url,wiki.wireshark.org/SMB2; classtype:misc-activity; sid:2059110; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, affected_product Windows_8, affected_product Windows_10, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_09, deployment Internal, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2025_01_09; target:src_ip;)