alert http any any -> $HOME_NET any (msg:"ET RETIRED TA453 IIS Credential Stealer Module/Backdoor Headers in HTTP Request"; flow:established,to_server; http.header_names; to_lowercase; content:"|0d 0a|x-beserver-pd|0d 0a|"; fast_pattern; content:"|0d 0a|x-verify-request|0d 0a|"; reference:url,www.bitdefender.com/blog/businessinsights/unpacking-bellaciao-a-closer-look-at-irans-latest-malware/; reference:md5,95c6fdc4f537bccca3079d94e65bc0b0; classtype:trojan-activity; sid:2045223; rev:3; metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2023_04_27, deployment Perimeter, deployment Internal, deployment SSLDecrypt, former_category MALWARE, malware_family TA453, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17; target:dest_ip;)