alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrojanDownloader.Agent.APBB Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri.raw; content:"//alert/7/"; bsize:10; fast_pattern; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; reference:md5,d2e2f0a2e553075d7968e55e15cd49a1; classtype:command-and-control; sid:2036318; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_20, deployment Perimeter, malware_family Win32_TrojanDownloader_Agent_APBB, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_20;)