ET MALWARE ELF/Emptiness v1.1 HTTP Flood Command Inbound

Query · suricata

flow:established,from_server;
dsize:<50;
content:"Lmh0dHA"; depth:7; fast_pattern;
pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/i";
Raw source ET MALWARE ELF/Emptiness v1.1 HTTP Flood Command Inbound · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE ELF/Emptiness v1.1 HTTP Flood Command Inbound";
    flow:established,from_server;
    dsize:<50;
    content:"Lmh0dHA"; depth:7; fast_pattern;
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/i";
    reference:url,blog.netlab.360.com/emptiness-a-new-evolving-botnet/;
    classtype:trojan-activity;
    sid:2027842; rev:2;
    metadata:affected_product Linux, created_at 2019_08_09, malware_family Emptiness, confidence High, signature_severity Major, tag DDoS, updated_at 2019_10_23;
)

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