ET MALWARE QuickResponseC2 Default Response Struct

Query · suricata

flow:established,to_server;
xbits:isset,ET.QuickResponseC2.Checkin,track ip_pair;
http.method;
content:"POST";
http.uri;
content:"/result"; startswith; fast_pattern;
pcre:"/^\d+\x5f\d+/R";
content:".png"; endswith;
http.header;
content:"Accept-Encoding|3a 20|gzip|2c 20|deflate|0d 0a|Accept|3a 20 2a 2f 2a 0d 0a|Connection|3a 20|keep-alive|0d 0a|Content-Type|3a 20|image|2f|png|0d 0a|Content-Length|3a 20|";
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE QuickResponseC2 Default Response Struct · 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE QuickResponseC2 Default Response Struct";
    flow:established,to_server;
    xbits:isset,ET.QuickResponseC2.Checkin,track ip_pair;
    http.method;
    content:"POST";
    http.uri;
    content:"/result"; startswith; fast_pattern;
    pcre:"/^\d+\x5f\d+/R";
    content:".png"; endswith;
    http.header;
    content:"Accept-Encoding|3a 20|gzip|2c 20|deflate|0d 0a|Accept|3a 20 2a 2f 2a 0d 0a|Connection|3a 20|keep-alive|0d 0a|Content-Type|3a 20|image|2f|png|0d 0a|Content-Length|3a 20|";
    reference:url,github.com/kimd155/QuickResponseC2;
    classtype:trojan-activity;
    sid:2058174; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2024_12_10, deployment Perimeter, malware_family QuickResponseC2, performance_impact Moderate, confidence High, signature_severity Major, tag C2_Framework, updated_at 2024_12_10, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:src_ip;
)

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