alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ReverseLoader Base64 Encoded Executable Inbound M1"; flow:established,to_client; http.response_body; content:"AAAA<<END>>"; endswith; reference:md5,c5139ae3f78d8413770f63ff2d6e2e40; classtype:trojan-activity; sid:2072298; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_29, deployment Perimeter, deployment SSLDecrypt, malware_family ReverseLoader, confidence High, signature_severity Major, updated_at 2026_09_29; target:dest_ip;)