ET HUNTING Possible RTF File With Obfuscated Version Header

Query · suricata

flow:established,to_client;
file_data;
content:"{|5C|rt"; within:4;
content:!"f"; within:1;
Raw source ET HUNTING Possible RTF File With Obfuscated Version Header · 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 HUNTING Possible RTF File With Obfuscated Version Header";
    flow:established,to_client;
    file_data;
    content:"{|5C|rt"; within:4;
    content:!"f"; within:1;
    classtype:bad-unknown;
    sid:2026863; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_01_30, deployment Perimeter, former_category INFO, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_29, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;
)

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