alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Raccoon Stealer CnC Activity (dependency download)"; flow:established,to_server; http.method; content:"GET"; http.uri.raw; content:"//l/f/"; startswith; fast_pattern; pcre:"/^[A-Za-z0-9_]{20}\/[a-f0-9]{40}$/R"; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; classtype:command-and-control; sid:2033973; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_16, deployment Perimeter, malware_family Raccoon_Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_16;)