/*
RansomEXX / Defray777 ransomware
*/

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

    strings:
        $s1 = "RansomEXX" ascii nocase
        $s2 = "RANSOM_NOTE.txt" ascii nocase
        $s3 = ".ransom" ascii nocase
        $s4 = "Defray777" ascii nocase

    condition:
        any of them
}

rule RansomEXX_PE
{
    meta:
        author = "ransomware.live"
        family = "ransomware.ransomexx"
        description = "Detects RansomEXX ransomware executable"
        date = "2026-05-04"
        severity = 9
        score = 90

    strings:
        $s1 = "RansomEXX" ascii wide
        $s2 = "Defray777" ascii nocase
        $s3 = "/proc/sys/vm/drop_caches" ascii

    condition:
        (uint16(0) == 0x5A4D or uint32(0) == 0x464C457F) and 2 of them
}