ET MALWARE IIStealer Inbound Exfil Request M2

Query · suricata

flow:established,to_server;
http.uri;
content:"/checkout/Payment.aspx"; bsize:22;
http.header;
content:"|0d 0a|X-IIS-Data|3a 20|"; fast_pattern;
Raw source ET MALWARE IIStealer Inbound Exfil Request M2 · 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 http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE IIStealer Inbound Exfil Request M2";
    flow:established,to_server;
    http.uri;
    content:"/checkout/Payment.aspx"; bsize:22;
    http.header;
    content:"|0d 0a|X-IIS-Data|3a 20|"; fast_pattern;
    reference:url,i.blackhat.com/USA21/Wednesday-Handouts/us-21-Anatomy-Of-Native-Iis-Malware-wp.pdf;
    classtype:trojan-activity;
    sid:2033707; rev:1;
    metadata:attack_target Server, created_at 2021_08_11, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_11;
)

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