ET MALWARE MSIL/TrojanDownloader.Small.CLJ CnC Activity

Query · suricata

flow:established,to_server;
http.start;
content:"GET /"; startswith;
content:"|20|HTTP/1.1|0d 0a|Referer|3a 20|Microsoft|20|Windows|20|"; fast_pattern;
http.user_agent;
content:"@";
http.header_names;
content:"|0d 0a|Referer|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:43;
Raw source ET MALWARE MSIL/TrojanDownloader.Small.CLJ CnC Activity · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/TrojanDownloader.Small.CLJ CnC Activity";
    flow:established,to_server;
    http.start;
    content:"GET /"; startswith;
    content:"|20|HTTP/1.1|0d 0a|Referer|3a 20|Microsoft|20|Windows|20|"; fast_pattern;
    http.user_agent;
    content:"@";
    http.header_names;
    content:"|0d 0a|Referer|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:43;
    reference:md5,fb7f916531e239c8a705249d93b48598;
    classtype:trojan-activity;
    sid:2032328; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_03_25, deployment Perimeter, malware_family MSIL_TrojanDownloader_Small_CLJ, performance_impact Low, confidence High, signature_severity Major, tag Downloader, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_25;
)

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