/*
PYSA / Mespinoza ransomware
*/

rule PYSA_Ransomnote
{
    meta:
        author = "ransomware.live"
        family = "ransomware.pysa"
        description = "Detects PYSA / Mespinoza ransom note"
        date = "2026-05-04"
        severity = 7
        score = 70

    strings:
        $s1 = "readme.README" ascii nocase
        $s2 = "PYSA" ascii
        $s3 = "camplejohn@tutamail" ascii nocase
        $s4 = "hello@pysa" ascii nocase
        $s5 = ".pysa" ascii

    condition:
        any of them
}

rule PYSA_PE
{
    meta:
        author = "ransomware.live"
        family = "ransomware.pysa"
        description = "Detects PYSA ransomware executable"
        date = "2026-05-04"
        severity = 9
        score = 90

    strings:
        $s1 = "PYSA" ascii wide
        $s2 = "Mespinoza" ascii nocase
        $s3 = "readme.README" ascii

    condition:
        uint16(0) == 0x5A4D and 2 of them
}