ET MALWARE Arid Viper APT Possible User-Agent (Skype)

Query · suricata

flow:established,to_server;
http.header;
content:"|0d 0a|REMOTE_USER|3a 20|";
http.user_agent;
content:"Skype"; nocase; fast_pattern; bsize:5;
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE Arid Viper APT Possible User-Agent (Skype) · 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 Arid Viper APT Possible User-Agent (Skype)";
    flow:established,to_server;
    http.header;
    content:"|0d 0a|REMOTE_USER|3a 20|";
    http.user_agent;
    content:"Skype"; nocase; fast_pattern; bsize:5;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-operation-arid-viper.pdf;
    classtype:targeted-activity;
    sid:2020442; rev:4;
    metadata:created_at 2015_02_17, confidence Medium, signature_severity Major, updated_at 2020_09_29;
)

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