alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Redirect via HTTP 300 to URI Shortening Service (rb .gy) with Fragment Identifier"; flow:established,to_client; http.stat_code; content:"30"; startswith; http.location; content:"http"; startswith; content:"rb.gy/"; nocase; fast_pattern; content:"#"; distance:5; within:1; pcre:"/^https?\x3a\x2f\x2f(?:www\.)?rb.gy\/[a-z0-9]{5}\#/mi"; reference:url,medium.com/@thrunter/cyberuptive-identifies-and-disrupts-ferest-smuggler-a-mass-credential-harvesting-campaign-22875c563854; classtype:misc-activity; sid:2047708; rev:1; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2023_08_23, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Minor, updated_at 2023_08_23, reviewed_at 2023_08_23; target:dest_ip;)