rule win_spedear_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.spedear."
        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.spedear"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 99 83e207 03c2 c1f803 83c40c 85c0 }
            // n = 6, score = 600
            //   99                   | cdq                 
            //   83e207               | and                 edx, 7
            //   03c2                 | add                 eax, edx
            //   c1f803               | sar                 eax, 3
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_1 = { 50 e8???????? 8b7e0c 895e10 }
            // n = 4, score = 500
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b7e0c               | mov                 edi, dword ptr [esi + 0xc]
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx

        $sequence_2 = { 8a5f06 50 894608 e8???????? }
            // n = 4, score = 500
            //   8a5f06               | mov                 bl, byte ptr [edi + 6]
            //   50                   | push                eax
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   e8????????           |                     

        $sequence_3 = { 894618 ffd7 89461c 5f }
            // n = 4, score = 400
            //   894618               | mov                 dword ptr [esi + 0x18], eax
            //   ffd7                 | call                edi
            //   89461c               | mov                 dword ptr [esi + 0x1c], eax
            //   5f                   | pop                 edi

        $sequence_4 = { 0fb7442414 338c8248080000 0fb7c5 038c82480c0000 33ce 836c241001 }
            // n = 6, score = 400
            //   0fb7442414           | mov                 bl, byte ptr [edi + 6]
            //   338c8248080000       | push                eax
            //   0fb7c5               | mov                 dword ptr [esi + 8], eax
            //   038c82480c0000       | mov                 bl, byte ptr [edi + 6]
            //   33ce                 | push                eax
            //   836c241001           | mov                 dword ptr [esi + 8], eax

        $sequence_5 = { 8d754c bb04000000 bf80000000 8d442410 50 8d4c241c }
            // n = 6, score = 400
            //   8d754c               | add                 eax, edx
            //   bb04000000           | sar                 eax, 3
            //   bf80000000           | add                 esp, 0xc
            //   8d442410             | and                 edx, 7
            //   50                   | add                 eax, edx
            //   8d4c241c             | sar                 eax, 3

        $sequence_6 = { 89442428 8b442430 57 6a00 6880000000 6a04 }
            // n = 6, score = 400
            //   89442428             | sar                 eax, 3
            //   8b442430             | add                 esp, 0xc
            //   57                   | push                eax
            //   6a00                 | mov                 edi, dword ptr [esi + 0xc]
            //   6880000000           | mov                 dword ptr [esi + 0x10], ebx
            //   6a04                 | mov                 eax, dword ptr [edi + 0x18]

        $sequence_7 = { ff15???????? 8b442410 8b742414 53 e8???????? }
            // n = 5, score = 400
            //   ff15????????         |                     
            //   8b442410             | add                 esp, 0xc
            //   8b742414             | and                 edx, 7
            //   53                   | add                 eax, edx
            //   e8????????           |                     

        $sequence_8 = { 6a00 68???????? e8???????? 83c40c 68d0070000 }
            // n = 5, score = 400
            //   6a00                 | push                0
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   68d0070000           | push                0x7d0

        $sequence_9 = { 40 753f 57 51 56 }
            // n = 5, score = 400
            //   40                   | sar                 eax, 3
            //   753f                 | add                 esp, 0xc
            //   57                   | test                eax, eax
            //   51                   | cdq                 
            //   56                   | and                 edx, 7

        $sequence_10 = { 8bc7 5e 5f 5b 5d c3 6a08 }
            // n = 7, score = 300
            //   8bc7                 | mov                 eax, edi
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a08                 | push                8

        $sequence_11 = { 394878 7456 39487c 7451 }
            // n = 4, score = 300
            //   394878               | cmp                 dword ptr [eax + 0x78], ecx
            //   7456                 | je                  0x58
            //   39487c               | cmp                 dword ptr [eax + 0x7c], ecx
            //   7451                 | je                  0x53

        $sequence_12 = { 833e00 741a 6a00 6a00 }
            // n = 4, score = 300
            //   833e00               | call                edi
            //   741a                 | mov                 dword ptr [esi + 0x1c], eax
            //   6a00                 | pop                 edi
            //   6a00                 | push                0

        $sequence_13 = { 6a00 6a00 ff7608 ff5604 6800800000 6a00 ff7608 }
            // n = 7, score = 300
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff7608               | push                dword ptr [esi + 8]
            //   ff5604               | call                dword ptr [esi + 4]
            //   6800800000           | push                0x8000
            //   6a00                 | push                0
            //   ff7608               | push                dword ptr [esi + 8]

        $sequence_14 = { 889de8fdffff e8???????? 57 bf???????? 57 8d85e0fbffff 68???????? }
            // n = 7, score = 200
            //   889de8fdffff         | push                0
            //   e8????????           |                     
            //   57                   | je                  0x1c
            //   bf????????           |                     
            //   57                   | push                0
            //   8d85e0fbffff         | push                0
            //   68????????           |                     

        $sequence_15 = { eb85 488d15286b0000 488d0d096b0000 e8???????? 488d15256b0000 }
            // n = 5, score = 100
            //   eb85                 | dec                 eax
            //   488d15286b0000       | test                ebx, ebx
            //   488d0d096b0000       | jle                 0x41
            //   e8????????           |                     
            //   488d15256b0000       | dec                 eax

        $sequence_16 = { 48635918 4533d2 4d8bca 4885db 7e36 488bf0 }
            // n = 6, score = 100
            //   48635918             | dec                 ecx
            //   4533d2               | sar                 esp, 5
            //   4d8bca               | dec                 esp
            //   4885db               | lea                 ebp, [0x89ae]
            //   7e36                 | and                 esi, 0x1f
            //   488bf0               | dec                 eax

        $sequence_17 = { 490394c140340100 f6423880 7441 e8???????? 33db 4533c9 }
            // n = 6, score = 100
            //   490394c140340100     | lea                 ecx, [esp + 0x151]
            //   f6423880             | xor                 edx, edx
            //   7441                 | inc                 ecx
            //   e8????????           |                     
            //   33db                 | mov                 eax, 0x103
            //   4533c9               | inc                 eax

        $sequence_18 = { e8???????? 83c410 3975d8 7409 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   83c410               | push                0x8000
            //   3975d8               | push                0
            //   7409                 | push                dword ptr [esi + 8]

        $sequence_19 = { 8d3400 33c0 66898435f4fdffff 8d85f4fdffff b9???????? e8???????? e8???????? }
            // n = 7, score = 100
            //   8d3400               | je                  0x1c
            //   33c0                 | push                0
            //   66898435f4fdffff     | push                0
            //   8d85f4fdffff         | push                dword ptr [esi + 8]
            //   b9????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_20 = { 8bf0 3bf3 7f14 8b75dc 68???????? }
            // n = 5, score = 100
            //   8bf0                 | push                0x8000
            //   3bf3                 | push                0
            //   7f14                 | push                dword ptr [esi + 8]
            //   8b75dc               | call                dword ptr [esi + 4]
            //   68????????           |                     

        $sequence_21 = { 488bf3 4c8be3 49c1fc05 4c8d2dae890000 83e61f 486bf658 4b8b44e500 }
            // n = 7, score = 100
            //   488bf3               | mov                 ecx, dword ptr [esp + 0x30]
            //   4c8be3               | dec                 eax
            //   49c1fc05             | cmp                 ecx, eax
            //   4c8d2dae890000       | dec                 eax
            //   83e61f               | mov                 esi, ebx
            //   486bf658             | dec                 esp
            //   4b8b44e500           | mov                 esp, ebx

        $sequence_22 = { 488bcf ff15???????? eb07 488bd5 8bce }
            // n = 5, score = 100
            //   488bcf               | inc                 ebp
            //   ff15????????         |                     
            //   eb07                 | xor                 edx, edx
            //   488bd5               | dec                 ebp
            //   8bce                 | mov                 ecx, edx

        $sequence_23 = { f08303ff 7516 488d055b970000 488b4c2430 483bc8 }
            // n = 5, score = 100
            //   f08303ff             | lock add            dword ptr [ebx], -1
            //   7516                 | jne                 0x18
            //   488d055b970000       | dec                 eax
            //   488b4c2430           | lea                 eax, [0x975b]
            //   483bc8               | dec                 eax

        $sequence_24 = { 4088bc2460020000 e8???????? 488d8c2451010000 33d2 41b803010000 4088bc2450010000 e8???????? }
            // n = 7, score = 100
            //   4088bc2460020000     | imul                esi, esi, 0x58
            //   e8????????           |                     
            //   488d8c2451010000     | dec                 ebx
            //   33d2                 | mov                 eax, dword ptr [ebp]
            //   41b803010000         | dec                 eax
            //   4088bc2450010000     | arpl                word ptr [ecx + 0x18], bx
            //   e8????????           |                     

        $sequence_25 = { ffc3 40302c01 3b5e1c 72ef }
            // n = 4, score = 100
            //   ffc3                 | mov                 esi, eax
            //   40302c01             | inc                 eax
            //   3b5e1c               | mov                 byte ptr [esp + 0x260], bh
            //   72ef                 | dec                 eax

    condition:
        7 of them and filesize < 188416
}