alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/RecordBreaker - Observed UA M5 (23591)"; flow:established,to_server; http.user_agent; bsize:5; content:"23591"; startswith; fast_pattern; reference:md5,d7535e529576d7d8819f5b0260f67bfe; classtype:trojan-activity; sid:2043003; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_23, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_RecordBreaker, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_27, reviewed_at 2025_10_24;)