ET EXPLOIT 7-Zip 7z File PPMd Properties Parsing Integer Underflow (CVE-2023-31102)

Query · suricata

flow:established,to_client;
file.magic;
content:"7-zip archive"; startswith;
file.data;
content:"7z|bc af 27 1c 00 30 00 00|"; startswith; fast_pattern;
pcre:"/\x30{24,}\x00\x30{24,}\x17\x06\x1a\x01/";
filesize:<10000;
target:dest_ip;
Raw source ET EXPLOIT 7-Zip 7z File PPMd Properties Parsing Integer Underflow (CVE-2023-31102) · 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 EXPLOIT 7-Zip 7z File PPMd Properties Parsing Integer Underflow (CVE-2023-31102)";
    flow:established,to_client;
    file.magic;
    content:"7-zip archive"; startswith;
    file.data;
    content:"7z|bc af 27 1c 00 30 00 00|"; startswith; fast_pattern;
    pcre:"/\x30{24,}\x00\x30{24,}\x17\x06\x1a\x01/";
    filesize:<10000;
    reference:url,ds-security.com/post/integer-overflow-in-7-zip-cve-2023-31102/;
    reference:cve,2023-31102;
    classtype:misc-attack;
    sid:2065690; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_11_06, cve CVE_2023_31102, deployment Perimeter, deployment Internal, confidence Low, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_06;
    target:dest_ip;
)

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