alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Tick Group APT Activity (GET)"; flow:established,to_server; http.request_line; content:"GET //"; http.user_agent; content:"|3b 20|Win32|29 3b|"; fast_pattern; pcre:"/^[0-9]{1,4}$/R"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,cb4a15d941a20985d145cd99fcaf3c82; reference:url,asec.ahnlab.com/ko/51150/; classtype:trojan-activity; sid:2044955; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_04_14, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_14; target:src_ip;)