alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Lazarus APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?"; pcre:"/^[A-F0-9]{32}\x3d(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; startswith; fast_pattern; reference:md5,3bce9bd375b4360a187623d30a152d06; reference:url,twitter.com/jaydinbas/status/1620386706657796096; classtype:trojan-activity; sid:2044044; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_01_31, deployment Perimeter, deployment SSLDecrypt, malware_family Lazarus, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_31; target:src_ip;)