alert http $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET MALWARE Stealbit Variant Data Exfil M1"; flow:to_server,established; http.method; content:"POST"; http.uri; content:!".html"; http.request_body; content:"&filesize="; content:"&framesize="; fast_pattern; content:"&framenum="; content:"&filecrc="; content:"&filename="; content:"&pcname="; reference:md5,f05af511670dba679d845e3d477e789d; reference:url,twitter.com/James_inthe_box/status/1425921372987944961; reference:url,blog.reversinglabs.com/blog/data-exfiltrator; classtype:command-and-control; sid:2033727; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_30;)