alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SideCopy APT Related Backdoor Sending System Information (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/streamcmd?AV="; startswith; fast_pattern; content:"&OS="; distance:0; content:"&Vesrion="; distance:0; content:"&detail="; distance:0; http.user_agent; content:"cpp-httplib/"; startswith; reference:url,twitter.com/malwareforme/status/1636005291849396224; classtype:trojan-activity; sid:2044625; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_03_15, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_15;)