ET MOBILE_MALWARE Kimsuky AppleSeed CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MOBILE_MALWARE Kimsuky AppleSeed CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?m="; fast_pattern;
    content:"&p1="; distance:1; within:4;
    content:"&p2="; distance:16; within:4;
    pcre:"/\.php\?m=[abcdefgh]&p1=[a-f0-9]{16}&p2=[^\r\n]+$/";
    http.user_agent;
    content:"Android";
    http.content_len;
    content:"0"; bsize:1;
    http.header_names;
    content:!"Referer";
    reference:url,blog.malwarebytes.com/threat-analysis/2021/06/kimsuky-apt-continues-to-target-south-korean-government-using-appleseed-backdoor;
    reference:md5,4626ed60dfc8deaf75477bc06bd39be7;
    classtype:trojan-activity;
    sid:2033059; rev:1;
    metadata:affected_product Android, attack_target Mobile_Client, created_at 2021_06_01, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)