ET MALWARE Win32/Chifrax.a CnC Exfil via TCP

Query · suricata

flow:established,to_server;
content:"|7c|"; offset:1; depth:1;
content:"|7c|0x6F6E6C696E657C"; distance:3; within:17; fast_pattern;
pcre:"/^(?:(?:[0-9]{1})\x7c(?:[0-9]{3})\x7c0x6F6E6C696E657C)/";
Raw source ET MALWARE Win32/Chifrax.a CnC Exfil via TCP · Suricata
Esc
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 1024: (
    msg:"ET MALWARE Win32/Chifrax.a CnC Exfil via TCP";
    flow:established,to_server;
    content:"|7c|"; offset:1; depth:1;
    content:"|7c|0x6F6E6C696E657C"; distance:3; within:17; fast_pattern;
    pcre:"/^(?:(?:[0-9]{1})\x7c(?:[0-9]{3})\x7c0x6F6E6C696E657C)/";
    reference:url,twitter.com/Jane_0sint/status/1701545803741905182;
    reference:md5,af090e363e79628671faf1b0a98587aa;
    classtype:trojan-activity;
    sid:2048043; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_09_12, deployment Perimeter, malware_family Win32_Chifrax_a, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_12, reviewed_at 2023_09_12;
)

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