ET MALWARE Win32/APT28 Host Fingerprint Exfiltration via IMAP

Query · suricata

flow:established,to_server;
content:"|24 20|APPEND|20|INBOX|20 7b|"; startswith;
pcre:"/[0-9]{1,2}\x7d\x0d\x0aFrom\x3a\x20a_/R";
pcre:"/Subject\x3a[0-9]{1,2}\x2f[0-9]{1,2}\x2f[0-9]{4}\x20[0-9]{1,2}\x3a[0-9]{1,2}\x3a[0-9]{2}\x20[AP]/R";
content:"M_report|0d 0a|"; within:10; fast_pattern;
Raw source ET MALWARE Win32/APT28 Host Fingerprint Exfiltration via IMAP · 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-pkt $HOME_NET any -> $EXTERNAL_NET 143 (
    msg:"ET MALWARE Win32/APT28 Host Fingerprint Exfiltration via IMAP";
    flow:established,to_server;
    content:"|24 20|APPEND|20|INBOX|20 7b|"; startswith;
    pcre:"/[0-9]{1,2}\x7d\x0d\x0aFrom\x3a\x20a_/R";
    pcre:"/Subject\x3a[0-9]{1,2}\x2f[0-9]{1,2}\x2f[0-9]{4}\x20[0-9]{1,2}\x3a[0-9]{1,2}\x3a[0-9]{2}\x20[AP]/R";
    content:"M_report|0d 0a|"; within:10; fast_pattern;
    reference:url,cert.gov.ua/article/341128;
    reference:md5,d3bddb5de864afd7e4f5e56027f4e5ea;
    classtype:command-and-control;
    sid:2037090; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_22, deployment Perimeter, malware_family Win32_APT28, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_22;
)

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