ET EXPLOIT Possible Android Stagefright MP4 CVE-2015-1538 - STSC

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Possible Android Stagefright MP4 CVE-2015-1538 - STSC";
    flow:established,from_server;
    file_data;
    content:"stsc|00 00 00 00 C0 00 00 03|"; fast_pattern;
    content:!"|00 00 00 00|"; within:4;
    pcre:"/^(?P<addr1>.{4})(?P<addr2>.{4})(?P=addr2)(?P=addr1)/Rsi";
    reference:cve,2015-1538;
    reference:url,blog.zimperium.com/the-latest-on-stagefright-cve-2015-1538-exploit-is-now-available-for-testing-purposes/;
    classtype:attempted-user;
    sid:2021759; rev:2;
    metadata:created_at 2015_09_10, cve CVE_2015_1538, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)