alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lazarus Group Backdoor CnC Checkin M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/index.php"; http.content_len; byte_test:0,=,41,0,string,dec; http.request_body; content:"sep|3d|"; startswith; fast_pattern; content:"uid|3d|"; pcre:"/^[a-f0-9]{8}/R"; content:"sid|3d|"; pcre:"/^\d{8}/R"; reference:md5,3c2aa3687ac9f466ce909e2cb12b07a5; reference:url,www.verfassungsschutz.de/SharedDocs/publikationen/DE/cyberabwehr/2024-02-19-joint-cyber-security-advisory-englisch.pdf?__blob=publicationFile&v=2; classtype:trojan-activity; sid:2051005; 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_02_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_02_21; target:src_ip;)