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main.yara
// import "math" include "webshells.yara" /*private global rule size_limit { condition: filesize < 1MB } private rule is_php { strings: $str = /<\?(php|\s)/ condition: (filesize < 1MB) and $str } private rule php_keywords_rate { strings: $keyword = /\b(this|if|return|function|else|array|false|true)\b/ condition: is_php and math.divide(#keyword, filesize) > 0.001 } rule php_packed { strings: $func1 = /base64_decode\s*\(/ $func2 = /eval\s*\(/ $func3 = /\$[a-zA-Z0-9_]+\(/ condition: is_php and (($func1 and $func2) or $func3) and (math.entropy(0, filesize) >= 5.00) and not php_keywords_rate //5.81 } *./
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