ET HUNTING SUSPICIOUS Local file read using read protocol

Query · suricata

flow:established,to_client;
file_data;
content:"read|3a|"; nocase; fast_pattern;
byte_test:1,>,0x21,-6,relative;
byte_test:1,<,0x28,-6,relative;
byte_test:1,!=,0x23,-6,relative;
byte_test:1,!=,0x24,-6,relative;
byte_test:1,!=,0x25,-6,relative;
byte_test:1,!=,0x26,-6,relative;
pcre:"/^\s*,\s*[a-zA-Z]\x3a[\x2f\x5c]/Ri";
Raw source ET HUNTING SUSPICIOUS Local file read using read protocol · 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 SUSPICIOUS Local file read using read protocol";
    flow:established,to_client;
    file_data;
    content:"read|3a|"; nocase; fast_pattern;
    byte_test:1,>,0x21,-6,relative;
    byte_test:1,<,0x28,-6,relative;
    byte_test:1,!=,0x23,-6,relative;
    byte_test:1,!=,0x24,-6,relative;
    byte_test:1,!=,0x25,-6,relative;
    byte_test:1,!=,0x26,-6,relative;
    pcre:"/^\s*,\s*[a-zA-Z]\x3a[\x2f\x5c]/Ri";
    reference:url,www.brokenbrowser.com/abusing-of-protocols/;
    classtype:misc-activity;
    sid:2024031; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2017_03_06, malware_family BrokenBrowser, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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