ET HUNTING SUSPICIOUS Single JS file inside of ZIP Download (Observed as lure in malspam campaigns)

Query · suricata

flow:established,to_client;
file_data;
content:"PK"; within:2;
content:"PK|01 02|"; distance:0;
pcre:"/^.{42}[\x20-\x7f]{1,500}\.jsPK\x05\x06.{4}\x01\x00\x01\x00/Rsi";
content:".jsPK|05 06|"; nocase; fast_pattern;
Raw source ET HUNTING SUSPICIOUS Single JS file inside of ZIP Download (Observed as lure in malspam campaigns) · Suricata
Esc
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 HUNTING SUSPICIOUS Single JS file inside of ZIP Download (Observed as lure in malspam campaigns)";
    flow:established,to_client;
    file_data;
    content:"PK"; within:2;
    content:"PK|01 02|"; distance:0;
    pcre:"/^.{42}[\x20-\x7f]{1,500}\.jsPK\x05\x06.{4}\x01\x00\x01\x00/Rsi";
    content:".jsPK|05 06|"; nocase; fast_pattern;
    classtype:misc-activity;
    sid:2022636; rev:4;
    metadata:created_at 2016_03_22, confidence Medium, signature_severity Informational, updated_at 2019_10_08;
)

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