ET MALWARE Sidecopy APT Related Backdoor Activity

Query · suricata

flow:established,to_server;
content:"|3c 7c|MAINSOCKET|7c 3e|"; startswith; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
content:!"Host|3a 20|";
Raw source ET MALWARE Sidecopy APT Related Backdoor Activity · 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 -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Sidecopy APT Related Backdoor Activity";
    flow:established,to_server;
    content:"|3c 7c|MAINSOCKET|7c 3e|"; startswith; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    content:!"Host|3a 20|";
    reference:url,twitter.com/bofheaded/status/1569261149845344261;
    reference:md5,e3cf9f7ccc2850ac5130cc73ca7762aa;
    classtype:trojan-activity;
    sid:2038798; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_09_12, deployment Perimeter, malware_family SideCopy, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_12;
)

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