alert http any any -> $HOME_NET any (msg:"ET HUNTING Symbolic Link (SLK) Excel XLM Macro"; flow:established,to_client; http.response_body; content:"ID|3b|P|0a|O|3b|E|0a|"; fast_pattern; content:"NN|3b|NAuto_open|3b|"; distance:0; content:"C|3b|"; distance:0; pcre:"/^(?:X\d+\x3b)?Y\d+\x3b(?:N\x3b)?(?:K(?:TRUE|FALSE|\d+)\x3b)?E[A-Z]+(?:\x28|\x2e[A-Z]+\x28)/R"; reference:url,www.outflank.nl/blog/2019/10/30/abusing-the-sylk-file-format/; classtype:misc-activity; sid:2057162; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_10_31, deployment Perimeter, confidence High, signature_severity Major, updated_at 2024_10_31; target:dest_ip;)