rule win_nymaim_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nymaim"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 89d8 01c8 31d2 f7f7 }
            // n = 4, score = 1800
            // 
            //   01c8                 | add                 eax, ecx
            //   31d2                 | xor                 edx, edx
            //   f7f7                 | div                 edi

        $sequence_1 = { 31d2 f7f7 92 31d2 bf64000000 }
            // n = 5, score = 1700
            //   31d2                 | xor                 edx, edx
            //   f7f7                 | div                 edi
            //   92                   | xchg                eax, edx
            //   31d2                 | xor                 edx, edx
            //   bf64000000           | mov                 edi, 0x64

        $sequence_2 = { 31d2 bf64000000 f7f7 5b }
            // n = 4, score = 1600
            //   31d2                 | xor                 edx, edx
            //   bf64000000           | mov                 edi, 0x64
            //   f7f7                 | div                 edi
            //   5b                   | pop                 ebx

        $sequence_3 = { 8b15???????? 0115???????? 8b0d???????? 010d???????? }
            // n = 4, score = 1600
            //   8b15????????         |                     
            //   0115????????         |                     
            //   8b0d????????         |                     
            //   010d????????         |                     

        $sequence_4 = { c1e902 83f900 7405 01d3 }
            // n = 4, score = 1600
            //   c1e902               | shr                 ecx, 2
            //   83f900               | cmp                 ecx, 0
            //   7405                 | je                  7
            //   01d3                 | add                 ebx, edx

        $sequence_5 = { 89d8 5e 5b 5f }
            // n = 4, score = 1600
            //   89d8                 | mov                 eax, ebx
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi

        $sequence_6 = { e8???????? 83f800 7405 e8???????? }
            // n = 4, score = 1600
            //   e8????????           |                     
            //   83f800               | cmp                 eax, 0
            //   7405                 | je                  7
            //   e8????????           |                     

        $sequence_7 = { 8b0d???????? 010d???????? 8b1d???????? 011d???????? }
            // n = 4, score = 1600
            //   8b0d????????         |                     
            //   010d????????         |                     
            //   8b1d????????         |                     
            //   011d????????         |                     

        $sequence_8 = { 89c7 89f8 5f 5e }
            // n = 4, score = 1600
            //   89c7                 | mov                 edi, eax
            //   89f8                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_9 = { 38f0 83d100 38d0 83d900 c1e105 }
            // n = 5, score = 1600
            //   38f0                 | cmp                 al, dh
            //   83d100               | adc                 ecx, 0
            //   38d0                 | cmp                 al, dl
            //   83d900               | sbb                 ecx, 0
            //   c1e105               | shl                 ecx, 5

        $sequence_10 = { 89c7 8b403c 01f8 0fb75006 }
            // n = 4, score = 1600
            //   89c7                 | mov                 edi, eax
            //   8b403c               | mov                 eax, dword ptr [eax + 0x3c]
            //   01f8                 | add                 eax, edi
            //   0fb75006             | movzx               edx, word ptr [eax + 6]

        $sequence_11 = { 83e103 c1e103 89d8 d3c8 }
            // n = 4, score = 1600
            //   83e103               | and                 ecx, 3
            //   c1e103               | shl                 ecx, 3
            //   89d8                 | mov                 eax, ebx
            //   d3c8                 | ror                 eax, cl

        $sequence_12 = { c1e105 01c8 c1c307 30c3 }
            // n = 4, score = 1600
            //   c1e105               | shl                 ecx, 5
            //   01c8                 | add                 eax, ecx
            //   c1c307               | rol                 ebx, 7
            //   30c3                 | xor                 bl, al

        $sequence_13 = { 8907 83c704 83c604 49 }
            // n = 4, score = 1400
            //   8907                 | mov                 dword ptr [edi], eax
            //   83c704               | add                 edi, 4
            //   83c604               | add                 esi, 4
            //   49                   | dec                 ecx

        $sequence_14 = { 8a06 8807 47 46 49 }
            // n = 5, score = 1400
            //   8a06                 | mov                 al, byte ptr [esi]
            //   8807                 | mov                 byte ptr [edi], al
            //   47                   | inc                 edi
            //   46                   | inc                 esi
            //   49                   | dec                 ecx

        $sequence_15 = { 00d3 8a16 301e 46 01fb }
            // n = 5, score = 1300
            //   00d3                 | add                 bl, dl
            //   8a16                 | mov                 dl, byte ptr [esi]
            //   301e                 | xor                 byte ptr [esi], bl
            //   46                   | inc                 esi
            //   01fb                 | add                 ebx, edi

        $sequence_16 = { c1e00b 3306 8b5604 0116 8b4e08 014e04 }
            // n = 6, score = 1100
            //   c1e00b               | shl                 eax, 0xb
            //   3306                 | xor                 eax, dword ptr [esi]
            //   8b5604               | mov                 edx, dword ptr [esi + 4]
            //   0116                 | add                 dword ptr [esi], edx
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   014e04               | add                 dword ptr [esi + 4], ecx

        $sequence_17 = { 89c7 8b06 c1e00b 3306 }
            // n = 4, score = 1100
            //   89c7                 | mov                 edi, eax
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   c1e00b               | shl                 eax, 0xb
            //   3306                 | xor                 eax, dword ptr [esi]

        $sequence_18 = { 31c3 c1e808 31c3 895e0c 89d8 01c8 }
            // n = 6, score = 1100
            //   31c3                 | xor                 ebx, eax
            //   c1e808               | shr                 eax, 8
            //   31c3                 | xor                 ebx, eax
            //   895e0c               | mov                 dword ptr [esi + 0xc], ebx
            //   89d8                 | mov                 eax, ebx
            //   01c8                 | add                 eax, ecx

        $sequence_19 = { 8d154e30d201 83ec04 891424 8945e8 }
            // n = 4, score = 100
            //   8d154e30d201         | lea                 edx, [0x1d2304e]
            //   83ec04               | sub                 esp, 4
            //   891424               | mov                 dword ptr [esp], edx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax

        $sequence_20 = { 57 83ec44 8b4508 8d0d2030d201 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   83ec44               | sub                 esp, 0x44
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8d0d2030d201         | lea                 ecx, [0x1d23020]

        $sequence_21 = { 894c2404 8945f8 e8???????? 8d0d3430d201 31d2 }
            // n = 5, score = 100
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   e8????????           |                     
            //   8d0d3430d201         | lea                 ecx, [0x1d23034]
            //   31d2                 | xor                 edx, edx

        $sequence_22 = { 8b4508 8d0d3430d201 31d2 890c24 c744240400000000 8945fc 8955f8 }
            // n = 7, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8d0d3430d201         | lea                 ecx, [0x1d23034]
            //   31d2                 | xor                 edx, edx
            //   890c24               | mov                 dword ptr [esp], ecx
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8955f8               | mov                 dword ptr [ebp - 8], edx

        $sequence_23 = { 5d c3 8b45f0 8b0c850440d201 8b55f8 39d1 }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b0c850440d201       | mov                 ecx, dword ptr [eax*4 + 0x1d24004]
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   39d1                 | cmp                 ecx, edx

        $sequence_24 = { 8955e8 e8???????? 8d0da230d201 890424 }
            // n = 4, score = 100
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   e8????????           |                     
            //   8d0da230d201         | lea                 ecx, [0x1d230a2]
            //   890424               | mov                 dword ptr [esp], eax

        $sequence_25 = { 8d0d3430d201 31d2 8b75f8 894608 890c24 c744240400000000 }
            // n = 6, score = 100
            //   8d0d3430d201         | lea                 ecx, [0x1d23034]
            //   31d2                 | xor                 edx, edx
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   890c24               | mov                 dword ptr [esp], ecx
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0

        $sequence_26 = { c744240400000000 8955d8 e8???????? 8d0dea30d201 890424 894c2404 e8???????? }
            // n = 7, score = 100
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   8955d8               | mov                 dword ptr [ebp - 0x28], edx
            //   e8????????           |                     
            //   8d0dea30d201         | lea                 ecx, [0x1d230ea]
            //   890424               | mov                 dword ptr [esp], eax
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   e8????????           |                     

    condition:
        7 of them and filesize < 2375680
}