alert http $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET MALWARE Stealbit Variant Data Exfil M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!".html"; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.request_body; content:"key="; startswith; fast_pattern; content:"&data="; within:100; pcre:"/^key=\w+\&data=/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,twitter.com/James_inthe_box/status/1425921372987944961; reference:url,blog.reversinglabs.com/blog/data-exfiltrator; classtype:command-and-control; sid:2033728; rev:7; 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 2024_04_30;)