rule win_mykings_spreader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mykings_spreader"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 89f8 85c0 0f8e900d0000 8b4508 8b00 8a4438ff 3a45f8 }
            // n = 7, score = 100
            //   89f8                 | mov                 eax, edi
            //   85c0                 | test                eax, eax
            //   0f8e900d0000         | jle                 0xd96
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8a4438ff             | mov                 al, byte ptr [eax + edi - 1]
            //   3a45f8               | cmp                 al, byte ptr [ebp - 8]

        $sequence_1 = { 740b 55 e8???????? 59 8bd8 eb02 }
            // n = 6, score = 100
            //   740b                 | je                  0xd
            //   55                   | push                ebp
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bd8                 | mov                 ebx, eax
            //   eb02                 | jmp                 4

        $sequence_2 = { 2480 25ff000000 752b 0fb645d4 83f80a }
            // n = 5, score = 100
            //   2480                 | and                 al, 0x80
            //   25ff000000           | and                 eax, 0xff
            //   752b                 | jne                 0x2d
            //   0fb645d4             | movzx               eax, byte ptr [ebp - 0x2c]
            //   83f80a               | cmp                 eax, 0xa

        $sequence_3 = { 6a00 e8???????? 8b35???????? 83c408 8d45e4 }
            // n = 5, score = 100
            //   6a00                 | push                0
            //   e8????????           |                     
            //   8b35????????         |                     
            //   83c408               | add                 esp, 8
            //   8d45e4               | lea                 eax, [ebp - 0x1c]

        $sequence_4 = { 56 57 8bf8 33c0 8b5704 85d2 7475 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax
            //   33c0                 | xor                 eax, eax
            //   8b5704               | mov                 edx, dword ptr [edi + 4]
            //   85d2                 | test                edx, edx
            //   7475                 | je                  0x77

        $sequence_5 = { 03700c 8bc6 2b45e4 3d00030000 }
            // n = 4, score = 100
            //   03700c               | add                 esi, dword ptr [eax + 0xc]
            //   8bc6                 | mov                 eax, esi
            //   2b45e4               | sub                 eax, dword ptr [ebp - 0x1c]
            //   3d00030000           | cmp                 eax, 0x300

        $sequence_6 = { 8173b728fd503e 40 2f 158edf2dcd 21443983 314e77 }
            // n = 6, score = 100
            //   8173b728fd503e       | xor                 dword ptr [ebx - 0x49], 0x3e50fd28
            //   40                   | inc                 eax
            //   2f                   | das                 
            //   158edf2dcd           | adc                 eax, 0xcd2ddf8e
            //   21443983             | and                 dword ptr [ecx + edi - 0x7d], eax
            //   314e77               | xor                 dword ptr [esi + 0x77], ecx

        $sequence_7 = { 00bc66a500dc51 a5 00ac51a5001053 a5 }
            // n = 4, score = 100
            //   00bc66a500dc51       | add                 byte ptr [esi + 0x51dc00a5], bh
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   00ac51a5001053       | add                 byte ptr [ecx + edx*2 + 0x531000a5], ch
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]

        $sequence_8 = { aa 897dfc 8b4510 ab c3 ff7514 }
            // n = 6, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   c3                   | ret                 
            //   ff7514               | push                dword ptr [ebp + 0x14]

        $sequence_9 = { 50 56 e8???????? 8bd8 85db 7431 807c240800 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx
            //   7431                 | je                  0x33
            //   807c240800           | cmp                 byte ptr [esp + 8], 0

        $sequence_10 = { 89d8 39f8 7e0b 89da 29fa 89f0 e8???????? }
            // n = 7, score = 100
            //   89d8                 | mov                 eax, ebx
            //   39f8                 | cmp                 eax, edi
            //   7e0b                 | jle                 0xd
            //   89da                 | mov                 edx, ebx
            //   29fa                 | sub                 edx, edi
            //   89f0                 | mov                 eax, esi
            //   e8????????           |                     

        $sequence_11 = { 42 89d0 89c1 c1f91f }
            // n = 4, score = 100
            //   42                   | inc                 edx
            //   89d0                 | mov                 eax, edx
            //   89c1                 | mov                 ecx, eax
            //   c1f91f               | sar                 ecx, 0x1f

        $sequence_12 = { 7200 7400 9c c7042400000080 7f00 e9???????? d9d0 }
            // n = 7, score = 100
            //   7200                 | jb                  2
            //   7400                 | je                  2
            //   9c                   | pushfd              
            //   c7042400000080       | mov                 dword ptr [esp], 0x80000000
            //   7f00                 | jg                  2
            //   e9????????           |                     
            //   d9d0                 | fnop                

        $sequence_13 = { 648920 eb14 8d45e8 50 e8???????? e8???????? 8945c0 }
            // n = 7, score = 100
            //   648920               | mov                 dword ptr fs:[eax], esp
            //   eb14                 | jmp                 0x16
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   e8????????           |                     
            //   e8????????           |                     
            //   8945c0               | mov                 dword ptr [ebp - 0x40], eax

        $sequence_14 = { 6a0f 56 50 e8???????? 83c40c 83c8ff 5e }
            // n = 7, score = 100
            //   6a0f                 | push                0xf
            //   56                   | push                esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   83c8ff               | or                  eax, 0xffffffff
            //   5e                   | pop                 esi

        $sequence_15 = { e8???????? c3 6a00 ff75fd }
            // n = 4, score = 100
            //   e8????????           |                     
            //   c3                   | ret                 
            //   6a00                 | push                0
            //   ff75fd               | push                dword ptr [ebp - 3]

    condition:
        7 of them and filesize < 1581056
}