ET MALWARE Win32/TrickBot maserv Module CnC Activity

Query · suricata

flow:to_server,established;
http.method;
content:"POST";
http.uri;
content:"/81"; endswith;
http.request_body;
content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|data|22 0d 0a 0d 0a|";
content:"|0d 0a|Content-Disposition|3a 20|form-data|3b 20|name=|22|source|22 0d 0a 0d 0a|PORT|20|scan|0d 0a|"; nocase; distance:0; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Win32/TrickBot maserv Module CnC Activity · 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 Win32/TrickBot maserv Module CnC Activity";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:"/81"; endswith;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|data|22 0d 0a 0d 0a|";
    content:"|0d 0a|Content-Disposition|3a 20|form-data|3b 20|name=|22|source|22 0d 0a 0d 0a|PORT|20|scan|0d 0a|"; nocase; distance:0; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:url,www.kryptoslogic.com/blog/2021/02/trickbot-masrv-module/;
    reference:md5,ff57c02b09cd9df4d1cac5090e01a5d2;
    classtype:trojan-activity;
    sid:2031601; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_02_02, deployment Perimeter, malware_family TrickBot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_02;
)

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