ET MALWARE Lazarus APT Related VSingle Backdoor Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php?uid=";
pcre:"/^[0-9]{8}/R";
content:"&upw="; fast_pattern; distance:0;
pcre:"/^(?:[A-Za-z0-9]{4})*(?:[A-Za-z0-9]{2}==|[A-Za-z0-9]{3}=|[A-Za-z0-9]{4})$/R";
http.user_agent;
content:"Linux|20|";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Lazarus APT Related VSingle Backdoor Activity (GET) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Lazarus APT Related VSingle Backdoor Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?uid=";
    pcre:"/^[0-9]{8}/R";
    content:"&upw="; fast_pattern; distance:0;
    pcre:"/^(?:[A-Za-z0-9]{4})*(?:[A-Za-z0-9]{2}==|[A-Za-z0-9]{3}=|[A-Za-z0-9]{4})$/R";
    http.user_agent;
    content:"Linux|20|";
    http.header_names;
    content:!"Referer";
    reference:md5,7ce51b56a6b0f8f78056ddfc5b5de67c;
    reference:url,blogs.jpcert.or.jp/en/2022/07/vsingle.html;
    classtype:trojan-activity;
    sid:2037276; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_07_05, deployment Perimeter, malware_family Lazarus, malware_family Stonefly, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_06;
)

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