alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CleanUp Loader HTTP Request (GET)"; flow:established,to_server; urilen:<18; http.method; content:"POST"; http.uri; content:"/api/"; startswith; pcre:"/^(?:connect(ivity)?|session)$/R"; http.user_agent; bsize:7; content:"HTTPGET"; fast_pattern; http.header_names; to_lowercase; strip_pseudo_headers; content:!"|0d 0a|referer|0d 0a|"; reference:url,go.recordedfuture.com/hubfs/reports/cta-2024-1009.pdf; reference:url,community.emergingthreats.net/t/signature-cleanup-loader/2038/; classtype:trojan-activity; sid:2056580; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_10_09, deployment Perimeter, deployment SSLDecrypt, malware_family Cleanup_Loader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_10_09;)