alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Request to ReverseLoader Payload"; flow:established,to_server; http.uri; content:"MSI_PRO"; fast_pattern; pcre:"/\x2e(?:png|jpg|jpeg|svg|gif|tiff)$/i"; http.header_names; to_lowercase; strip_pseudo_headers; content:!"|0d 0a|referer|0d 0a|"; classtype:trojan-activity; sid:2072097; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_18, deployment Perimeter, deployment SSLDecrypt, malware_family ReverseLoader, confidence High, signature_severity Major, updated_at 2026_09_18, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)