alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Sharp Panda APT Related Activity M3"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/org/background.php?Data="; fast_pattern; startswith; http.header_names; content:"|0d 0a|Connection|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:md5,37e8ba415702f9f24e497bf6111e3e0c; classtype:trojan-activity; sid:2049931; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, created_at 2024_01_08, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_10_03, reviewed_at 2024_10_03; target:src_ip;)