alert http $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE Suspected Tick Group APT Related Activity (GET)"; flow:established,to_server; urilen:>40; http.method; content:"GET"; http.uri; pcre:"/\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\/$/"; http.header_names; content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:42; fast_pattern; http.user_agent; content:"|3b 20|WinHttp.WinHttpRequest."; reference:md5,ed97cf996bda070de3b7fa1e75b762b1; reference:url,asec.ahnlab.com/ko/51150/; classtype:trojan-activity; sid:2044932; rev:1; 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 2023_04_14; target:src_ip;)