alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MOONSTONE SLEET APT Payload Delivery Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/user/user.asp?id|3d|"; fast_pattern; startswith; pcre:"/^[A-Z0-9]{6,7}$/R"; reference:url,securitylabs.datadoghq.com/articles/stressed-pungsan-dprk-aligned-threat-actor-leverages-npm-for-initial-access/#reusing-fake-authors; classtype:trojan-activity; sid:2054939; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2024_08_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_08_06; target:src_ip;)