ET MALWARE Possible SombRAT Initial DNS Lookup

Query · suricata

dns.query;
content:!".amazonaws.com";
content:!".cooperhewitt.org";
content:!".sagaftra.org";
content:!".a2zinc.net";
content:!".zalando-lounge.ch";
content:!".sipri.org";
content:!".y-cloud.net";
content:"images"; nocase; depth:6; fast_pattern;
content:!"images."; depth:7;
content:"."; distance:8; within:1;
pcre:"/^images[a-f0-9]{8}\./i";
Raw source ET MALWARE Possible SombRAT Initial DNS Lookup · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert dns $HOME_NET any -> any any (
    msg:"ET MALWARE Possible SombRAT Initial DNS Lookup";
    dns.query;
    content:!".amazonaws.com";
    content:!".cooperhewitt.org";
    content:!".sagaftra.org";
    content:!".a2zinc.net";
    content:!".zalando-lounge.ch";
    content:!".sipri.org";
    content:!".y-cloud.net";
    content:"images"; nocase; depth:6; fast_pattern;
    content:!"images."; depth:7;
    content:"."; distance:8; within:1;
    pcre:"/^images[a-f0-9]{8}\./i";
    reference:md5,f43377b04b66d1aed783cd6037e3298d;
    reference:url,blogs.blackberry.com/en/2020/11/the-costaricto-campaign-cyber-espionage-outsourced;
    classtype:trojan-activity;
    sid:2031251; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_03, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_22;
)

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