alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL.L4L Stealer Systeminfo Exfiltration"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?action=upload&host="; fast_pattern; content:"@"; distance:0; http.request_body; content:"filename=|22|system.info|22|"; http.header_names; content:!"User-Agent"; content:!"Referer"; content:!"Accept"; reference:md5,918ffdba1014ec647ae24ddc9de9fde9; classtype:command-and-control; sid:2028931; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_31, deployment Perimeter, malware_family MSIL_L4L, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21;)