alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected TA430/Andariel CollectionRAT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?plan="; fast_pattern; content:"&page="; distance:0; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Accept|0d 0a|"; startswith; content:!"Referer"; reference:md5,c90d094a8fbeaa8a0083c7372bfc1897; reference:url,blog.talosintelligence.com/lazarus-collectionrat/; classtype:trojan-activity; sid:2047726; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_08_24, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_24, reviewed_at 2023_08_24; target:src_ip;)