YARA Rule: underground.yar

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Valid Rule

/*
Underground ransomware
*/

rule Underground_Ransomnote
{
    meta:
        author = "ransomware.live"
        family = "ransomware.underground"
        description = "Detects Underground ransomware ransom note"
        date = "2026-05-04"
        severity = 7
        score = 70

    strings:
        $s1 = "underground" ascii nocase
        $s2 = "!readme.txt" ascii nocase
        $s3 = "underground.onion" ascii nocase

    condition:
        2 of them
}