ET RETIRED IceApple User-Agent observed

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Microsoft Office/16.0 |28|Windows NT 10.0|3b 20|Microsoft Outlook 16.0.4551|3b 20|Pro|29|";
http.header_names;
content:!"Referer";
Raw source ET RETIRED IceApple User-Agent observed · Suricata
Esc
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 RETIRED IceApple User-Agent observed";
    flow:established,to_server;
    http.user_agent;
    content:"Microsoft Office/16.0 |28|Windows NT 10.0|3b 20|Microsoft Outlook 16.0.4551|3b 20|Pro|29|";
    http.header_names;
    content:!"Referer";
    reference:url,www.crowdstrike.com/wp-content/uploads/2022/05/crowdstrike-iceapple-a-novel-internet-information-services-post-exploitation-framework.pdf;
    classtype:trojan-activity;
    sid:2036602; rev:3;
    metadata:attack_target Server, created_at 2022_05_17, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family IceApple, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_12, reviewed_at 2024_09_12;
)

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