alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WasabiSeed Backdoor Payload Request (GET)"; flow:established,to_server; urilen:<13; http.method; content:"GET"; http.uri; pcre:"/^\/-?[0-9]{8,10}$/"; http.user_agent; bsize:17; content:"Windows Installer"; fast_pattern; reference:url,twitter.com/Unit42_Intel/status/1608567622856998912; classtype:trojan-activity; sid:2043239; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_09, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_27, reviewed_at 2025_10_24;)