alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Known Sinkhole Response Header INetSim"; flow:established,from_server; http.content_type; content:"x-msdos-program"; file.data; content:"MZ|0a|Sinkholed|0a|"; depth:13; fast_pattern; endswith; classtype:trojan-activity; sid:2025585; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_05_25, deployment Perimeter, confidence High, signature_severity Minor, updated_at 2020_09_16;)