alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SmartLoader CnC Activity"; flow:established,to_server; urilen:>47; http.method; content:"PUT"; http.uri; content:"/loader/"; startswith; fast_pattern; pcre:"/^(?:[a-zA-Z0-9]{40,43})$/R"; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.request_body; content:"|7b 22|data|22 3a 20|"; startswith; http.content_type; content:"application/json"; bsize:16; http.header_names; content:!"Referer|0d 0a|"; reference:url,community.emergingthreats.net/t/smartloader/1428; classtype:trojan-activity; sid:2051456; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_03_04, deployment Perimeter, malware_family SmartLoader, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_04;)