ET MOBILE_MALWARE signed-unsigned integer mismatch code-verification bypass

Query · suricata

flow:from_server,established;
http.stat_code;
content:"200";
http.stat_msg;
content:"OK";
file.data;
content:"PK"; depth:2;
content:"|FD FF|"; distance:26; within:2;
content:".dex"; nocase; within:128;
Raw source ET MOBILE_MALWARE signed-unsigned integer mismatch code-verification bypass · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MOBILE_MALWARE signed-unsigned integer mismatch code-verification bypass";
    flow:from_server,established;
    http.stat_code;
    content:"200";
    http.stat_msg;
    content:"OK";
    file.data;
    content:"PK"; depth:2;
    content:"|FD FF|"; distance:26; within:2;
    content:".dex"; nocase; within:128;
    reference:url,sophos.com/2013/07/17/anatomy-of-another-android-hole-chinese-researchers-claim-new-code-verification-bypass/;
    classtype:trojan-activity;
    sid:2017163; rev:3;
    metadata:created_at 2013_07_17, signature_severity Major, updated_at 2020_04_24;
)

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