alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DOILoader Activity M2 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[A-Za-z0-9]{7}\/[0-9]{9}\.png$/"; http.header_names; content:"|0d 0a|Connection|0d 0a|Host|0d 0a 0d 0a|"; bsize:22; http.host; content:"i.ibb.co"; bsize:8; fast_pattern; reference:md5,7d71c897223fbc3c0b0ec324e27804e3; reference:md5,219e1bd62a715ebbe536ea581e0c1578; classtype:trojan-activity; sid:2050896; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_02_16, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_16; target:src_ip;)