ET MALWARE Win32/AsyncRAT CnC Checkin (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php?id="; fast_pattern;
content:"&key="; distance:0;
pcre:"/^(?:[0-9]{11})/R";
content:"&s="; within:3;
pcre:"/^(?:[0-9]{3})$/R";
http.user_agent;
content:"WindowsPowerShell/";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
Raw source ET MALWARE Win32/AsyncRAT CnC Checkin (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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/AsyncRAT CnC Checkin (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?id="; fast_pattern;
    content:"&key="; distance:0;
    pcre:"/^(?:[0-9]{11})/R";
    content:"&s="; within:3;
    pcre:"/^(?:[0-9]{3})$/R";
    http.user_agent;
    content:"WindowsPowerShell/";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22;
    reference:url,twitter.com/Unit42_Intel/status/1760426508558950518;
    classtype:trojan-activity;
    sid:2051076; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_02_23, deployment Perimeter, malware_family AsyncRAT, performance_impact Significant, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_23;
)

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