alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Kimsuky AppleSeed CnC Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?m="; fast_pattern; content:"&p1="; distance:1; within:4; pcre:"/\.php\?m=[abcdefgh]&p1=[a-f0-9]{16}$/"; http.user_agent; content:"Android"; http.content_len; bsize:1; content:"0"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,twitter.com/AhnLab_SecuInfo/status/1460101266760089600; reference:md5,e7caf25de7ce463a6f22ecb8689389ad; classtype:trojan-activity; sid:2034512; rev:3; metadata:attack_target Mobile_Client, created_at 2021_11_18, deployment Perimeter, malware_family Kimsuky, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, reviewed_at 2023_08_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)