ET MALWARE Ursnif Variant CnC Data Exfil

Query · suricata

flow:established,to_server;
urilen:>125;
http.method;
content:"POST";
http.uri;
pcre:"/\.[a-z]{3,4}$/";
http.request_body;
content:"name=|22|upload_file|22 3b 20|filename=|22|"; fast_pattern;
content:".bin|22 0d 0a|"; distance:4; within:7;
http.header_names;
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Ursnif Variant CnC Data Exfil · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ursnif Variant CnC Data Exfil";
    flow:established,to_server;
    urilen:>125;
    http.method;
    content:"POST";
    http.uri;
    pcre:"/\.[a-z]{3,4}$/";
    http.request_body;
    content:"name=|22|upload_file|22 3b 20|filename=|22|"; fast_pattern;
    content:".bin|22 0d 0a|"; distance:4; within:7;
    http.header_names;
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,f870c0d62691fc39194922e4a59fdc1c;
    classtype:command-and-control;
    sid:2021830; rev:4;
    metadata:created_at 2015_09_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_01;
)

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.