ET HUNTING Suspicious X-mailer Synapse Inbound to SMTP Server

Query · suricata

flow:established,to_server;
content:"produced by Synapse"; fast_pattern;
content:"X|2d|mailer|3a 20|Synapse|20 2d 20|Pascal TCP|2f|IP library by Lukas Gebauer";
Raw source ET HUNTING Suspicious X-mailer Synapse Inbound to SMTP Server · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS [25,587] (
    msg:"ET HUNTING Suspicious X-mailer Synapse Inbound to SMTP Server";
    flow:established,to_server;
    content:"produced by Synapse"; fast_pattern;
    content:"X|2d|mailer|3a 20|Synapse|20 2d 20|Pascal TCP|2f|IP library by Lukas Gebauer";
    reference:url,www.joewein.net/spam/spam-joejob.htm;
    classtype:trojan-activity;
    sid:2021135; rev:2;
    metadata:created_at 2015_05_21, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;
)

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