ET MALWARE Bitter RAT HTTP CnC Beacon M2

Query · suricata

flow:established,to_server;
threshold:type both, count 5, seconds 120, track by_src;
http.method;
content:"GET";
http.uri;
content:".php?TIe="; fast_pattern;
pcre:"/^[a-zA-Z0-9\x21\x2a\x2f\x2e\x3b\x3a\x5b\x5d\x7b\x7d]+$/R";
http.header_names;
content:!"User-Agent|0d 0a|";
content:!"Accept";
content:!"Referer";
Raw source ET MALWARE Bitter RAT HTTP CnC Beacon M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Bitter RAT HTTP CnC Beacon M2";
    flow:established,to_server;
    threshold:type both, count 5, seconds 120, track by_src;
    http.method;
    content:"GET";
    http.uri;
    content:".php?TIe="; fast_pattern;
    pcre:"/^[a-zA-Z0-9\x21\x2a\x2f\x2e\x3b\x3a\x5b\x5d\x7b\x7d]+$/R";
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer";
    reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018;
    reference:md5,cc58dd8592555ff6275196e62af3242e;
    reference:md5,8d42c01180be7588a2a68ad96dd0cf85;
    classtype:command-and-control;
    sid:2025198; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2018_01_11, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2020_08_27, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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