ET MALWARE Dridex POST Retrieving Second Stage M2

Query · suricata

flow:established,to_server;
content:"|0d 0a 0d 0a|"; distance:0;
byte_extract:1,4,Dridex.Pivot,relative;
byte_test:1,!=,Dridex.Pivot,0,relative;
byte_test:1,=,Dridex.Pivot,7,relative;
pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/R";
http.host;
pcre:"/^(?=[a-z0-9]{0,19}[A-Z])(?:(?=[A-Z0-9]{0,19}[a-z])|(?=[A-Za-z]{0,19}\d)|(?=[A-Z]+\.))[a-zA-Z0-9]{3,20}[\x2e\x20][a-z]{2,3}$/";
http.start;
content:"POST / HTTP/1.1|0d 0a|"; depth:17; fast_pattern;
Raw source ET MALWARE Dridex POST Retrieving Second Stage 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Dridex POST Retrieving Second Stage M2";
    flow:established,to_server;
    content:"|0d 0a 0d 0a|"; distance:0;
    byte_extract:1,4,Dridex.Pivot,relative;
    byte_test:1,!=,Dridex.Pivot,0,relative;
    byte_test:1,=,Dridex.Pivot,7,relative;
    pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/R";
    http.host;
    pcre:"/^(?=[a-z0-9]{0,19}[A-Z])(?:(?=[A-Z0-9]{0,19}[a-z])|(?=[A-Za-z]{0,19}\d)|(?=[A-Z]+\.))[a-zA-Z0-9]{3,20}[\x2e\x20][a-z]{2,3}$/";
    http.start;
    content:"POST / HTTP/1.1|0d 0a|"; depth:17; fast_pattern;
    reference:md5,148112df459ba40b9127f7d4f1c08df2;
    classtype:trojan-activity;
    sid:2020825; rev:8;
    metadata:created_at 2015_04_01, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_19;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.