ET MALWARE VoidLink C2 API Requests Outbound

Query · suricata

flow:established,to_server;
flowbits:isset,http.dottedquadhost;
http.uri;
content:"/api/";
pcre:"/^(?:v(?:1\x2f(?:notifications|settings|analytics\x2fevents)|2\x2f(?:sync|heartbeat))|health\x2fcheck|metrics|plugins\x2f[\w\.]+|sideload(?:\x2f[\w\.]+)?)$/R";
http.header_names; bsize:52;
content:"|0d 0a|Host|0d 0a|Content-Type|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; fast_pattern;
http.content_type;
content:"application/json";

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 VoidLink C2 API Requests Outbound · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE VoidLink C2 API Requests Outbound";
    flow:established,to_server;
    flowbits:isset,http.dottedquadhost;
    http.uri;
    content:"/api/";
    pcre:"/^(?:v(?:1\x2f(?:notifications|settings|analytics\x2fevents)|2\x2f(?:sync|heartbeat))|health\x2fcheck|metrics|plugins\x2f[\w\.]+|sideload(?:\x2f[\w\.]+)?)$/R";
    http.header_names; bsize:52;
    content:"|0d 0a|Host|0d 0a|Content-Type|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; fast_pattern;
    http.content_type;
    content:"application/json";
    reference:url,research.checkpoint.com/2026/voidlink-the-cloud-native-malware-framework/;
    classtype:trojan-activity;
    sid:2067196; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2026_01_30, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2026_01_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.