alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MagikPOS CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/?act=in"; fast_pattern; pcre:"/\/api\/\?act=in$/"; http.request_body; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Content-Type|0d 0a|"; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,121c1008d54e91db66feaf67b3d4084e; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/majikpos-combines-pos-malware-and-rats/; classtype:command-and-control; sid:2024067; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_03_16, deployment Perimeter, malware_family MagikPOS, confidence High, signature_severity Major, tag POS, tag c2, updated_at 2020_10_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)