alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lazarus Group Backdoor CnC Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.content_len; byte_test:0,=,76,0,string,dec; http.request_body; content:"img|3d|"; startswith; fast_pattern; 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:2051006; 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 TLSDecrypt, created_at 2024_02_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_21; target:src_ip;)