alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BirchParalysis Payload Request (GET) M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/main/mh1-"; fast_pattern; content:".png"; endswith; http.user_agent; content:"WindowsPowerShell"; http.host; pcre:"/^(?:raw\x2e)?github(?:usercontent)?\x2ecom$/"; http.header_names; content:!"|0d 0a|referer|0d 0a|"; nocase; content:!"|0d 0a|content-type|0d 0a|"; nocase; classtype:trojan-activity; sid:2066228; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_12_09, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, updated_at 2025_12_09; target:src_ip;)