alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cylance Ransomware Sending System Information (POST)"; flow:established,to_server; urilen:<10; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"AppleWebKit/587.38 (KHTML, like Gecko)"; bsize:38; http.header_names; content:!"Referer|0d 0a|"; http.request_body; content:"eyJpcCI6"; startswith; fast_pattern; reference:md5,31ed39e13ae9da7fa610f85b56838dde; reference:url,twitter.com/Unit42_Intel/status/1641588431221342208; classtype:trojan-activity; sid:2044917; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_04_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_10; target:src_ip;)