ET MALWARE Suspected Win32/TinyNode Activity (Outbound)

Query · suricata

flow:established,to_server;
content:"|7b 22|ok|22 3a|true,|22|result|22 3a|"; fast_pattern; startswith;
content:"|7b 30 2e|";
pcre:"/^[0-9]{15,16}\x7d$/R";
content:!"User-Agent|3a 20|";
content:!"Host|3a 20|";
Raw source ET MALWARE Suspected Win32/TinyNode Activity (Outbound) · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected Win32/TinyNode Activity (Outbound)";
    flow:established,to_server;
    content:"|7b 22|ok|22 3a|true,|22|result|22 3a|"; fast_pattern; startswith;
    content:"|7b 30 2e|";
    pcre:"/^[0-9]{15,16}\x7d$/R";
    content:!"User-Agent|3a 20|";
    content:!"Host|3a 20|";
    reference:md5,3e4ab86263e0ff5a35f2e3fb17d03727;
    reference:url,blog.group-ib.com/oldgremlin_comeback;
    classtype:trojan-activity;
    sid:2038743; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_09_06, deployment Perimeter, malware_family OldGremlin, malware_family TinyNode, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_21;
)

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