rule win_byeby_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.byeby."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.byeby"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 8d842484030000 50 ff15???????? 6a00 }
            // n = 4, score = 100
            //   8d842484030000       | lea                 eax, [esp + 0x384]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_1 = { e8???????? 68???????? 8d8424c8010000 0f57c0 50 f30f7f8424cc010000 ff15???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   8d8424c8010000       | lea                 eax, [esp + 0x1c8]
            //   0f57c0               | xorps               xmm0, xmm0
            //   50                   | push                eax
            //   f30f7f8424cc010000     | movdqu    xmmword ptr [esp + 0x1cc], xmm0
            //   ff15????????         |                     

        $sequence_2 = { e8???????? 83c408 8bd8 eb56 6a00 6a01 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bd8                 | mov                 ebx, eax
            //   eb56                 | jmp                 0x58
            //   6a00                 | push                0
            //   6a01                 | push                1

        $sequence_3 = { 6a00 50 e8???????? 0fb785bcf9ffff 660f6f05???????? 56 50 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   0fb785bcf9ffff       | movzx               eax, word ptr [ebp - 0x644]
            //   660f6f05????????     |                     
            //   56                   | push                esi
            //   50                   | push                eax

        $sequence_4 = { 8d942438030000 c744241400000000 8d4c2414 c78424380300006578706c c784243c0300006f726572 }
            // n = 5, score = 100
            //   8d942438030000       | lea                 edx, [esp + 0x338]
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   c78424380300006578706c     | mov    dword ptr [esp + 0x338], 0x6c707865
            //   c784243c0300006f726572     | mov    dword ptr [esp + 0x33c], 0x7265726f

        $sequence_5 = { 037b74 c7437400000000 eb24 6a00 ff75a8 8d043e }
            // n = 6, score = 100
            //   037b74               | add                 edi, dword ptr [ebx + 0x74]
            //   c7437400000000       | mov                 dword ptr [ebx + 0x74], 0
            //   eb24                 | jmp                 0x26
            //   6a00                 | push                0
            //   ff75a8               | push                dword ptr [ebp - 0x58]
            //   8d043e               | lea                 eax, [esi + edi]

        $sequence_6 = { 53 c745ec362e312e c745f037363033 c745f42e313630 66c745f83030 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   c745ec362e312e       | mov                 dword ptr [ebp - 0x14], 0x2e312e36
            //   c745f037363033       | mov                 dword ptr [ebp - 0x10], 0x33303637
            //   c745f42e313630       | mov                 dword ptr [ebp - 0xc], 0x3036312e
            //   66c745f83030         | mov                 word ptr [ebp - 8], 0x3030

        $sequence_7 = { c7838000000000000000 e9???????? 8b7588 8b4374 85c0 741c }
            // n = 6, score = 100
            //   c7838000000000000000     | mov    dword ptr [ebx + 0x80], 0
            //   e9????????           |                     
            //   8b7588               | mov                 esi, dword ptr [ebp - 0x78]
            //   8b4374               | mov                 eax, dword ptr [ebx + 0x74]
            //   85c0                 | test                eax, eax
            //   741c                 | je                  0x1e

        $sequence_8 = { ff15???????? 85c0 75a3 83ceff 57 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   75a3                 | jne                 0xffffffa5
            //   83ceff               | or                  esi, 0xffffffff
            //   57                   | push                edi

        $sequence_9 = { 03348518ab0110 33db 395e08 7531 6a0a }
            // n = 5, score = 100
            //   03348518ab0110       | add                 esi, dword ptr [eax*4 + 0x1001ab18]
            //   33db                 | xor                 ebx, ebx
            //   395e08               | cmp                 dword ptr [esi + 8], ebx
            //   7531                 | jne                 0x33
            //   6a0a                 | push                0xa

    condition:
        7 of them and filesize < 253952
}