ET HUNTING Google API AddItNow Open Redirect Link Inbound

Query · suricata

flow:established,to_client;
content:"apis.google.com/additnow/l|3f|"; fast_pattern;
pcre:"/^(?:^|.*?(?:(?:\x26|\x2526)(?:amp|\x23(?:38|x26))?))__lu\x3d/R";
target:dest_ip;
Raw source ET HUNTING Google API AddItNow Open Redirect Link Inbound · 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 tcp any any -> $HOME_NET any (
    msg:"ET HUNTING Google API AddItNow Open Redirect Link Inbound";
    flow:established,to_client;
    content:"apis.google.com/additnow/l|3f|"; fast_pattern;
    pcre:"/^(?:^|.*?(?:(?:\x26|\x2526)(?:amp|\x23(?:38|x26))?))__lu\x3d/R";
    reference:url,seclists.org/fulldisclosure/2025/Oct/11;
    classtype:misc-activity;
    sid:2065531; rev:1;
    metadata:created_at 2025_10_28, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_28;
    target:dest_ip;
)

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