alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected TA404 SIGNBT Backdoor Activity (POST)"; flow:established,to_server; urilen:>20; http.method; content:"POST"; http.uri; content:".php"; endswith; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.header_names; bsize:64; content:"|0d 0a|Connection|0d 0a|Content-Type|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|Host|0d 0a 0d 0a|"; fast_pattern; http.request_body; pcre:"/^(?:[a-zA-Z0-9]{3,7})\x3d(?:[A-Za-z0-9+/]{64})$/"; reference:md5,9b62352851c9f82157d1d7fcafeb49d3; reference:url,securelist.com/unveiling-lazarus-new-campaign/110888/; classtype:trojan-activity; sid:2049001; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_10_31, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03, reviewed_at 2023_10_31; target:src_ip;)