ET SCAN StarDotStar HELO, suspected AUTH LOGIN botnet

Query · suricata

flow:established,to_server;
content:"HELO|20 2a 2e 2a 0d 0a|"; depth:11;
Raw source ET SCAN StarDotStar HELO, suspected AUTH LOGIN botnet · 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 smtp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SCAN StarDotStar HELO, suspected AUTH LOGIN botnet";
    flow:established,to_server;
    content:"HELO|20 2a 2e 2a 0d 0a|"; depth:11;
    classtype:bad-unknown;
    sid:2026463; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_09, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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