ET MALWARE Possible APT Sarhurst/Husar/Hussarini/Hassar CnC Check Response

Query · suricata

flow:from_server,established;
http.stat_code;
content:"200";
file.data;
content:"<CHECK>"; depth:7;
content:"</CHECK>"; endswith; fast_pattern;
pcre:"/^<CHECK>(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})<\/CHECK>$/";
Raw source ET MALWARE Possible APT Sarhurst/Husar/Hussarini/Hassar CnC Check Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible APT Sarhurst/Husar/Hussarini/Hassar CnC Check Response";
    flow:from_server,established;
    http.stat_code;
    content:"200";
    file.data;
    content:"<CHECK>"; depth:7;
    content:"</CHECK>"; endswith; fast_pattern;
    pcre:"/^<CHECK>(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})<\/CHECK>$/";
    reference:url,www.fortinet.com/blog/threat-research/hussarini---targeted-cyber-attack-in-the-philippines.html;
    classtype:targeted-activity;
    sid:2027707; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_07_15, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_11;
)

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