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/*
SunCrypt ransomware
*/


rule SunCrypt
{
    meta:
        author = "rivitna"
        family = "ransomware.suncrypt.windows"
        description = "SunCrypt ransomware Windows payload"
        severity = 10
        score = 100

    strings:
        $h0 = { B0 00 02 00 C7 00 A3 00 00 00 [8-16] 83 C? 20 }
        $h1 = { C7 00 A3 00 00 00 [8-16]
                ( 81 C7 B0 00 02 00 83 C? 20 | 83 C? 20 81 C7 B0 00 02 00) }

        $s1 = "-noshares\x00" wide
        $s2 = "\x00-nomutex\x00" wide
        $s3 = "\x00-noreport\x00" wide
        $s4 = "\x00-noservices\x00" wide
        $s5 = "\x00-justcrypt\x00" wide
        $s6 = "\x00-keep_exe\x00" wide
        $s7 = "\x00$Recycle.bin\x00" wide
        $s8 = "%s\\efi\\microsoft\\boot\\bootmgr.efi\x00" wide
        $s9 = "YOUR_FILES_ARE_ENCRYPTED.HTML\x00" wide
        $s10 = "\x0D... %d ...\x00" ascii

        $a1 = "<a href=\"http://" ascii xor(0x11-0x22)
        $a2 = ".onion/chat.html?" ascii xor(0x11-0x22)
        $a3 = "<h2>Why pay us?</h2>" ascii xor(0x11-0x22)
        $a4 = "background-color: #1a1a1a;" ascii xor(0x11-0x22)
        $a5 = "rem !important;" ascii xor(0x11-0x22)
        $a6 = "TOR browser" ascii xor(0x11-0x22)
        $a7 = "torproject.org" ascii xor(0x11-0x22)

    condition:
        ((uint16(0) == 0x5A4D) and (uint32(uint32(0x3C)) == 0x00004550)) and
        (
            (1 of ($h*)) or
            (5 of ($s*)) or
            (4 of ($a*))
        )
}