ET MALWARE Suspected Parallax RAT Checkin

Query · suricata

flow:established,to_server;
dsize:<300;
content:"|09 b4 30 eb 6a 8d 00 11|"; startswith; fast_pattern;
content:!"HTTP";
threshold:type both, count 5, seconds 60, track by_src;
target:src_ip;
Raw source ET MALWARE Suspected Parallax RAT Checkin · 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 any (
    msg:"ET MALWARE Suspected Parallax RAT Checkin";
    flow:established,to_server;
    dsize:<300;
    content:"|09 b4 30 eb 6a 8d 00 11|"; startswith; fast_pattern;
    content:!"HTTP";
    threshold:type both, count 5, seconds 60, track by_src;
    reference:url,www.esentire.com/blog/unveiling-parallax-rat-a-journey-from-infection-to-lateral-movement;
    reference:md5,4c3021987d039f59a3aa6fcd423143f5;
    reference:md5,2b199211ed7ddd31f0a5f0c651f44457;
    reference:md5,e50508784f3b00921f2507279ebce81a;
    classtype:trojan-activity;
    sid:2051947; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_05, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_05;
    target:src_ip;
)

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