ET MALWARE Arkei/Vidar/Mars Stealer Variant CnC checkin commands

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/windbg"; fast_pattern; bsize:7;
http.content_len;
byte_test:0,<,84,0,string,dec;
http.header_names;
content:!"Referer";
http.request_body;
content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|type|22 0d 0a 0d 0a|";
pcre:"/^(?:ct_start|chr_start|moz_start|grb_start|upl_start)/R";
Raw source ET MALWARE Arkei/Vidar/Mars Stealer Variant CnC checkin commands · 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 Arkei/Vidar/Mars Stealer Variant CnC checkin commands";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/windbg"; fast_pattern; bsize:7;
    http.content_len;
    byte_test:0,<,84,0,string,dec;
    http.header_names;
    content:!"Referer";
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|type|22 0d 0a 0d 0a|";
    pcre:"/^(?:ct_start|chr_start|moz_start|grb_start|upl_start)/R";
    reference:md5,844ab1b8a2db0242a20a6f3bbceedf6b;
    classtype:trojan-activity;
    sid:2038523; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_08_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_15, reviewed_at 2025_07_14;
)

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