ET EXPLOIT Ghostscript illegal read undefinedfilename attempt (SMTP)

Query · suricata

flow:to_server,established;
file_data;
content:"undefinedfilename"; fast_pattern;
content:"errordict";
content:"invalidfileaccess";
content:"typecheck";
pcre:"/errordict\s+\x2Finvalidfileaccess/smi";
Raw source ET EXPLOIT Ghostscript illegal read undefinedfilename attempt (SMTP) · Suricata
Esc
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 -> $SMTP_SERVERS any (
    msg:"ET EXPLOIT Ghostscript illegal read undefinedfilename attempt (SMTP)";
    flow:to_server,established;
    file_data;
    content:"undefinedfilename"; fast_pattern;
    content:"errordict";
    content:"invalidfileaccess";
    content:"typecheck";
    pcre:"/errordict\s+\x2Finvalidfileaccess/smi";
    reference:url,seclists.org/oss-sec/2018/q3/142;
    classtype:attempted-user;
    sid:2026086; rev:2;
    metadata:attack_target SMTP_Server, created_at 2018_09_05, deployment Datacenter, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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