ET MALWARE Downloader Retrieving Malicious Powershell in DNS Response

Query · suricata

content:"|00 10 00 01|"; offset:2;
content:"-match '@(.*)@'){$str +=";
content:"[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($matches[1]))}"; fast_pattern;
Raw source ET MALWARE Downloader Retrieving Malicious Powershell in DNS Response · 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 any any -> $HOME_NET any (
    msg:"ET MALWARE Downloader Retrieving Malicious Powershell in DNS Response";
    content:"|00 10 00 01|"; offset:2;
    content:"-match '@(.*)@'){$str +=";
    content:"[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($matches[1]))}"; fast_pattern;
    reference:md5,968c50386bdc33286367ce8ee50d029b;
    reference:url,twitter.com/SBousseaden/status/1270992052055089158;
    classtype:trojan-activity;
    sid:2030315; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_06_11, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_11;
)

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