ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile

Query · suricata

flow:established,to_server;
http.uri;
content:"/";
content:".exe"; distance:1; within:8; fast_pattern; endswith;
pcre:"/\/[A-Z]?[a-z]{1,3}[0-9]?\.exe$/";
http.header;
content:!"koggames";
http.host;
content:!"download.bitdefender.com"; endswith;
content:!".appspot.com"; endswith;
content:!"kaspersky.com"; endswith;
content:!".sophosxl.net"; endswith;
http.header_names;
content:!"Referer"; nocase;
Raw source ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile";
    flow:established,to_server;
    http.uri;
    content:"/";
    content:".exe"; distance:1; within:8; fast_pattern; endswith;
    pcre:"/\/[A-Z]?[a-z]{1,3}[0-9]?\.exe$/";
    http.header;
    content:!"koggames";
    http.host;
    content:!"download.bitdefender.com"; endswith;
    content:!".appspot.com"; endswith;
    content:!"kaspersky.com"; endswith;
    content:!".sophosxl.net"; endswith;
    http.header_names;
    content:!"Referer"; nocase;
    classtype:bad-unknown;
    sid:2019714; rev:13;
    metadata:created_at 2014_11_15, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22;
)

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