alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Office Template Style Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/templates-"; startswith; fast_pattern; pcre:"/\x3f(?:office|id|officeid)\x3d[A-Z0-9]{8,16}$/R"; http.user_agent; content:!"|20 3b|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:md5,44b3f46a370faf94cc51386b4ccaab83; reference:md5,1c64df70f2016714c24abcc69b56d46c; classtype:bad-unknown; sid:2042519; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_12_08, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_08; target:src_ip;)