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| Dir : /var/imunify360/files/sigs/v1/heuristic/ |
| Server: Linux premium279.web-hosting.com 4.18.0-553.45.1.lve.el8.x86_64 #1 SMP Wed Mar 26 12:08:09 UTC 2025 x86_64 IP: 66.29.132.192 |
| Dir : //var/imunify360/files/sigs/v1/heuristic/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
}
*./