ET MALWARE W32/Asprox CnC Beacon

Query · suricata

flow:established,to_server;
http.host;
pcre:"/\x3a\d{1,5}$/";
http.user_agent;
content:"Mozilla/4.0 (compatible|3B| MSIE 6.0b|3B| Windows NT 5.0|3B| .NET CLR"; fast_pattern;
http.uri;
pcre:"/^\x2F[a-f0-9]{40,60}$/i";
Raw source ET MALWARE W32/Asprox CnC Beacon · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE W32/Asprox CnC Beacon";
    flow:established,to_server;
    http.host;
    pcre:"/\x3a\d{1,5}$/";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3B| MSIE 6.0b|3B| Windows NT 5.0|3B| .NET CLR"; fast_pattern;
    http.uri;
    pcre:"/^\x2F[a-f0-9]{40,60}$/i";
    reference:url,www.trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-asprox-reborn.pdf;
    classtype:command-and-control;
    sid:2016528; rev:8;
    metadata:attack_target Client_Endpoint, created_at 2013_03_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_12_10, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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