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Cyber Programmer
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System : Linux host.digitalbabaji.in 4.18.0-513.11.1.el8_9.x86_64 #1 SMP Wed Jan 17 02:00:40 EST 2024 x86_64
User : addictionfreeind ( 1003)
PHP Version : 7.2.34
Disable Function : exec,passthru,shell_exec,system
Directory :  /var/imunify360/files/sigs/v1_2025-11-04T113007.546688Z/heuristic/

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Current File : //var/imunify360/files/sigs/v1_2025-11-04T113007.546688Z/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
}
*./

VaKeR 2022