alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Tick Group APT Related Activity (GET)"; flow:established,to_server; urilen:1; http.method; content:"GET"; http.header_names; bsize:51; content:"|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; fast_pattern; http.host; content:"www.face"; startswith; pcre:"/^[0-9]{5}book\.com$/R"; reference:md5,2db7b0e8b0a3b7f142c4246d8c8bf892; reference:url,asec.ahnlab.com/ko/51150/; classtype:trojan-activity; sid:2044931; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_04_13, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03, reviewed_at 2024_03_11; target:src_ip;)