ET MALWARE CASHY200 Style DNS Query - Sending Hostname

Query · suricata

dns.query; bsize:>30;
content:"61643"; offset:5; depth:5;
content:"31303"; distance:7; within:5;
pcre:"/^[a-zA-Z0-9]{5}6164(?:3[0-9]){4}31303[0-9](?:[a-f0-9][a-f0-9]){5,}\./";
Raw source ET MALWARE CASHY200 Style DNS Query - Sending Hostname · Suricata
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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 CASHY200 Style DNS Query - Sending Hostname";
    dns.query; bsize:>30;
    content:"61643"; offset:5; depth:5;
    content:"31303"; distance:7; within:5;
    pcre:"/^[a-zA-Z0-9]{5}6164(?:3[0-9]){4}31303[0-9](?:[a-f0-9][a-f0-9]){5,}\./";
    reference:url,unit42.paloaltonetworks.com/more-xhunt-new-powershell-backdoor-blocked-through-dns-tunnel-detection/;
    classtype:command-and-control;
    sid:2028667; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_10, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Major, updated_at 2020_10_19;
)

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