rule win_microcin_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.microcin."
        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.microcin"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 488bcb 664489642438 488bf0 ff15???????? }
            // n = 4, score = 400
            //   488bcb               | xor                 esi, esi
            //   664489642438         | push                eax
            //   488bf0               | call                ebx
            //   ff15????????         |                     

        $sequence_1 = { ff15???????? 488d4d90 ff15???????? 4863c8 807c0d8f5c }
            // n = 5, score = 400
            //   ff15????????         |                     
            //   488d4d90             | lea                 eax, [ebp - 0x108]
            //   ff15????????         |                     
            //   4863c8               | push                0x104
            //   807c0d8f5c           | push                eax

        $sequence_2 = { ff15???????? b9fd030000 2bc8 488bd3 }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   b9fd030000           | push                esi
            //   2bc8                 | push                esi
            //   488bd3               | test                eax, eax

        $sequence_3 = { 6a10 50 56 ff15???????? 85c0 0f45f7 }
            // n = 6, score = 400
            //   6a10                 | jle                 0x1c
            //   50                   | cmp                 byte ptr [ebp + esi - 0x158], 0x3a
            //   56                   | je                  0x2d
            //   ff15????????         |                     
            //   85c0                 | lea                 eax, [ebp - 0x158]
            //   0f45f7               | lea                 eax, [ebp - 0x158]

        $sequence_4 = { 4863df 488bcb e8???????? 4c8be0 }
            // n = 4, score = 400
            //   4863df               | push                eax
            //   488bcb               | push                0x1005
            //   e8????????           |                     
            //   4c8be0               | push                0xffff

        $sequence_5 = { 6804010000 50 ff15???????? 8d85f8feffff }
            // n = 4, score = 400
            //   6804010000           | push                eax
            //   50                   | push                0x104
            //   ff15????????         |                     
            //   8d85f8feffff         | lea                 eax, [ebp - 0x110]

        $sequence_6 = { ffd3 85c0 7e18 80bc35a8feffff3a 741f 8d85a8feffff }
            // n = 6, score = 400
            //   ffd3                 | add                 eax, 0xffffff44
            //   85c0                 | push                0xe
            //   7e18                 | sar                 edx, cl
            //   80bc35a8feffff3a     | movzx               eax, byte ptr [ebp - 2]
            //   741f                 | add                 eax, edx
            //   8d85a8feffff         | mov                 byte ptr [ebp - 2], al

        $sequence_7 = { ff15???????? 8b3d???????? 8d85e0feffff 50 ffd7 }
            // n = 5, score = 400
            //   ff15????????         |                     
            //   8b3d????????         |                     
            //   8d85e0feffff         | test                eax, eax
            //   50                   | jle                 0x1c
            //   ffd7                 | cmp                 byte ptr [ebp + esi - 0x158], 0x3a

        $sequence_8 = { ffc3 48ffc7 ff15???????? 3bd8 7ce8 }
            // n = 5, score = 400
            //   ffc3                 | cmovne              esi, edi
            //   48ffc7               | lea                 eax, [ebp - 0x54]
            //   ff15????????         |                     
            //   3bd8                 | push                eax
            //   7ce8                 | push                0x80000001

        $sequence_9 = { ff15???????? 4863c8 c6840d8002000077 488d8d80020000 ff15???????? 4863c8 c6840d8002000075 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   4863c8               | call                ebx
            //   c6840d8002000077     | test                eax, eax
            //   488d8d80020000       | jle                 0x1e
            //   ff15????????         |                     
            //   4863c8               | cmp                 byte ptr [ebp + esi - 0x158], 0x3a
            //   c6840d8002000075     | je                  0x2f

        $sequence_10 = { 488d4c2460 ff15???????? 4863c8 807c0c5f5c }
            // n = 4, score = 400
            //   488d4c2460           | push                esi
            //   ff15????????         |                     
            //   4863c8               | call                esi
            //   807c0c5f5c           | lea                 eax, [ebp - 0x54]

        $sequence_11 = { ff75d4 e8???????? 83c40c 8bc7 }
            // n = 4, score = 400
            //   ff75d4               | cmp                 byte ptr [ebp + esi - 0x158], 0x3a
            //   e8????????           |                     
            //   83c40c               | test                eax, eax
            //   8bc7                 | je                  0x2a

        $sequence_12 = { 33c0 488b1d???????? 488903 48894308 488b0d???????? ff15???????? }
            // n = 6, score = 400
            //   33c0                 | lea                 eax, [ebp - 0x108]
            //   488b1d????????       |                     
            //   488903               | push                eax
            //   48894308             | push                eax
            //   488b0d????????       |                     
            //   ff15????????         |                     

        $sequence_13 = { 8b1d???????? 8d85a8feffff 50 ffd3 85c0 }
            // n = 5, score = 400
            //   8b1d????????         |                     
            //   8d85a8feffff         | add                 esp, 0xc
            //   50                   | lea                 eax, [ebp - 0x24]
            //   ffd3                 | push                eax
            //   85c0                 | mov                 esi, eax

        $sequence_14 = { 68ffff0000 56 8b35???????? ffd6 }
            // n = 4, score = 400
            //   68ffff0000           | lea                 eax, [0x112b7]
            //   56                   | inc                 ecx
            //   8b35????????         |                     
            //   ffd6                 | mov                 ecx, 3

        $sequence_15 = { ff15???????? 85c0 7426 8b400c }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   85c0                 | jne                 0xffffffea
            //   7426                 | push                esi
            //   8b400c               | dec                 esp

        $sequence_16 = { 8b4df8 83c101 894df8 837df81a 0f8d67010000 }
            // n = 5, score = 200
            //   8b4df8               | push                esi
            //   83c101               | cli                 
            //   894df8               | cli                 
            //   837df81a             | cli                 
            //   0f8d67010000         | cli                 

        $sequence_17 = { 6e 7669 726f 6e 6d 656e 7400 }
            // n = 7, score = 200
            //   6e                   | outsb               dx, byte ptr [esi]
            //   7669                 | jbe                 0x6b
            //   726f                 | jb                  0x71
            //   6e                   | outsb               dx, byte ptr [esi]
            //   6d                   | insd                dword ptr es:[edi], dx
            //   656e                 | outsb               dx, byte ptr gs:[esi]
            //   7400                 | je                  2

        $sequence_18 = { fa fa fa fa fa fa }
            // n = 6, score = 200
            //   fa                   | cli                 
            //   fa                   | cli                 
            //   fa                   | cli                 
            //   fa                   | cli                 
            //   fa                   | cli                 
            //   fa                   | cli                 

        $sequence_19 = { 53 53 56 43 }
            // n = 4, score = 200
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   56                   | push                esi
            //   43                   | inc                 ebx

        $sequence_20 = { 4883ec20 8bd9 488d0d950c0100 ff15???????? 4885c0 7419 }
            // n = 6, score = 200
            //   4883ec20             | mov                 ecx, ebp
            //   8bd9                 | inc                 ebp
            //   488d0d950c0100       | xor                 ecx, ecx
            //   ff15????????         |                     
            //   4885c0               | inc                 ebp
            //   7419                 | xor                 eax, eax

        $sequence_21 = { 4885c0 7419 488d15730c0100 488bc8 ff15???????? }
            // n = 5, score = 200
            //   4885c0               | lea                 edx, [0x111f8]
            //   7419                 | inc                 ecx
            //   488d15730c0100       | mov                 eax, 0x12010
            //   488bc8               | jne                 0x1c
            //   ff15????????         |                     

        $sequence_22 = { 8b55fc c7422400000000 8b45fc 83c008 50 }
            // n = 5, score = 200
            //   8b55fc               | push                0
            //   c7422400000000       | push                eax
            //   8b45fc               | add                 esp, 0x38
            //   83c008               | inc                 eax
            //   50                   | pop                 edi

        $sequence_23 = { ff15???????? 418d7c24e7 85c0 752a 4c8d0502130100 8bd7 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   418d7c24e7           | dec                 eax
            //   85c0                 | lea                 edx, [0x111f8]
            //   752a                 | inc                 ecx
            //   4c8d0502130100       | mov                 eax, 0x12010
            //   8bd7                 | dec                 eax

        $sequence_24 = { 488d15f8110100 41b810200100 488bcd e8???????? e9???????? 4533c9 4533c0 }
            // n = 7, score = 200
            //   488d15f8110100       | dec                 eax
            //   41b810200100         | lea                 edx, [0x111f8]
            //   488bcd               | inc                 ecx
            //   e8????????           |                     
            //   e9????????           |                     
            //   4533c9               | mov                 eax, 0x12010
            //   4533c0               | dec                 eax

        $sequence_25 = { 8b85c4f4ffff 83e802 898558ffffff 8b8dc4f4ffff 6bc903 894d9c }
            // n = 6, score = 200
            //   8b85c4f4ffff         | cli                 
            //   83e802               | cli                 
            //   898558ffffff         | cli                 
            //   8b8dc4f4ffff         | cli                 
            //   6bc903               | cli                 
            //   894d9c               | jae                 0x7e

        $sequence_26 = { ff15???????? 8b4df4 8b5124 83c201 8b45f4 895024 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   8b4df4               | outsb               dx, byte ptr gs:[esi]
            //   8b5124               | je                  5
            //   83c201               | dec                 ecx
            //   8b45f4               | push                ebx
            //   895024               | push                ebx

        $sequence_27 = { 6828010000 8d85ccfeffff 6a00 50 }
            // n = 4, score = 200
            //   6828010000           | cli                 
            //   8d85ccfeffff         | cli                 
            //   6a00                 | cli                 
            //   50                   | dec                 ecx

        $sequence_28 = { 4c8d0502130100 8bd7 498bcd e8???????? }
            // n = 4, score = 200
            //   4c8d0502130100       | je                  0x1b
            //   8bd7                 | dec                 eax
            //   498bcd               | lea                 edx, [0x10c73]
            //   e8????????           |                     

        $sequence_29 = { 4c8d056c120100 498bd4 488bcd e8???????? }
            // n = 4, score = 200
            //   4c8d056c120100       | test                eax, eax
            //   498bd4               | je                  0x25
            //   488bcd               | inc                 ecx
            //   e8????????           |                     

        $sequence_30 = { 898a04010000 c7857cffffff00000000 eb0f 8b857cffffff }
            // n = 4, score = 200
            //   898a04010000         | cli                 
            //   c7857cffffff00000000     | cli    
            //   eb0f                 | push                0x128
            //   8b857cffffff         | lea                 eax, [ebp - 0x134]

        $sequence_31 = { 7370 696465726167656e 742e 657865 }
            // n = 4, score = 200
            //   7370                 | jae                 0x72
            //   696465726167656e     | imul                esp, dword ptr [ebp + 0x72], 0x6e656761
            //   742e                 | je                  0x30
            //   657865               | js                  0x68

        $sequence_32 = { 41bc14030000 4c8d0574130100 488bcd 418bd4 e8???????? 33c9 85c0 }
            // n = 7, score = 200
            //   41bc14030000         | dec                 eax
            //   4c8d0574130100       | sub                 esp, 0x20
            //   488bcd               | mov                 ebx, ecx
            //   418bd4               | dec                 eax
            //   e8????????           |                     
            //   33c9                 | lea                 ecx, [0x10c95]
            //   85c0                 | dec                 eax

        $sequence_33 = { e8???????? 85c0 751a 488d15f8110100 41b810200100 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   85c0                 | mov                 esp, 0x314
            //   751a                 | dec                 esp
            //   488d15f8110100       | lea                 eax, [0x11374]
            //   41b810200100         | dec                 eax

        $sequence_34 = { 0f8404010000 8b4508 8b8804010000 83c103 8b5508 }
            // n = 5, score = 200
            //   0f8404010000         | imul                esp, dword ptr [ebp + 0x72], 0x6e656761
            //   8b4508               | je                  0x46
            //   8b8804010000         | js                  0x80
            //   83c103               | outsb               dx, byte ptr [esi]
            //   8b5508               | insd                dword ptr es:[edi], dx

        $sequence_35 = { 5d c3 8b04cdf4314100 5d c3 0544ffffff 6a0e }
            // n = 7, score = 200
            //   5d                   | pop                 esi
            //   c3                   | pop                 ebp
            //   8b04cdf4314100       | push                0
            //   5d                   | call                dword ptr [ebp - 0x24]
            //   c3                   | test                eax, eax
            //   0544ffffff           | je                  0x1a6
            //   6a0e                 | mov                 eax, dword ptr [esi + 0x10]

        $sequence_36 = { 8b45f8 8b4dfc 894820 8b55f8 83c208 }
            // n = 5, score = 200
            //   8b45f8               | outsb               dx, byte ptr gs:[esi]
            //   8b4dfc               | je                  5
            //   894820               | jb                  0x71
            //   8b55f8               | outsb               dx, byte ptr [esi]
            //   83c208               | insd                dword ptr es:[edi], dx

        $sequence_37 = { 636373 7673 6873742e65 7865 }
            // n = 4, score = 200
            //   636373               | arpl                word ptr [ebx + 0x73], sp
            //   7673                 | jbe                 0x75
            //   6873742e65           | push                0x652e7473
            //   7865                 | js                  0x67

        $sequence_38 = { 50 68???????? 8935???????? ff15???????? 8d85d4f4ffff 50 }
            // n = 6, score = 100
            //   50                   | mov                 ecx, dword ptr [ebp - 8]
            //   68????????           |                     
            //   8935????????         |                     
            //   ff15????????         |                     
            //   8d85d4f4ffff         | add                 ecx, 1
            //   50                   | mov                 dword ptr [ebp - 8], ecx

        $sequence_39 = { 8d85d4f4ffff 50 ff15???????? 6804010000 8d85f0feffff }
            // n = 5, score = 100
            //   8d85d4f4ffff         | mov                 ecx, dword ptr [eax + 0x104]
            //   50                   | add                 ecx, 3
            //   ff15????????         |                     
            //   6804010000           | mov                 edx, dword ptr [ebp + 8]
            //   8d85f0feffff         | mov                 eax, dword ptr [ebp - 8]

        $sequence_40 = { 83c438 40 5f 5e 5d }
            // n = 5, score = 100
            //   83c438               | push                ebx
            //   40                   | push                ebx
            //   5f                   | push                esi
            //   5e                   | inc                 ebx
            //   5d                   | cli                 

        $sequence_41 = { 83c408 8d95f0feffff 8bce e8???????? 83c404 }
            // n = 5, score = 100
            //   83c408               | mov                 ecx, dword ptr [ebp - 4]
            //   8d95f0feffff         | mov                 dword ptr [eax + 0x20], ecx
            //   8bce                 | mov                 edx, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   83c404               | add                 edx, 8

        $sequence_42 = { 8b4f08 49 8b5710 e8???????? 41 }
            // n = 5, score = 100
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]
            //   49                   | dec                 ecx
            //   8b5710               | mov                 edx, dword ptr [edi + 0x10]
            //   e8????????           |                     
            //   41                   | inc                 ecx

        $sequence_43 = { ff15???????? 83c40c 8d45dc 50 ff15???????? 8bf0 85f6 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   83c40c               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8d45dc               | mov                 edx, dword ptr [ecx + 0x24]
            //   50                   | add                 edx, 1
            //   ff15????????         |                     
            //   8bf0                 | mov                 eax, dword ptr [ebp - 0xc]
            //   85f6                 | mov                 dword ptr [eax + 0x24], edx

        $sequence_44 = { 0f85a5000000 8d85b8feffff 50 ff15???????? 0fb785c4feffff 50 }
            // n = 6, score = 100
            //   0f85a5000000         | mov                 ecx, dword ptr [ebp - 0xb3c]
            //   8d85b8feffff         | imul                ecx, ecx, 3
            //   50                   | mov                 dword ptr [ebp - 0x64], ecx
            //   ff15????????         |                     
            //   0fb785c4feffff       | je                  0x10a
            //   50                   | mov                 eax, dword ptr [ebp + 8]

        $sequence_45 = { 48 8d542450 c70238020000 ffd3 }
            // n = 4, score = 100
            //   48                   | dec                 eax
            //   8d542450             | lea                 edx, [esp + 0x50]
            //   c70238020000         | mov                 dword ptr [edx], 0x238
            //   ffd3                 | call                ebx

        $sequence_46 = { 7411 50 ff15???????? c705????????00000000 e8???????? 85c0 }
            // n = 6, score = 100
            //   7411                 | cmp                 dword ptr [ebp - 8], 0x1a
            //   50                   | jge                 0x174
            //   ff15????????         |                     
            //   c705????????00000000     |     
            //   e8????????           |                     
            //   85c0                 | mov                 dword ptr [edx + 0x104], ecx

        $sequence_47 = { 4c 89e1 03d0 e8???????? eb0b 4c }
            // n = 6, score = 100
            //   4c                   | dec                 esp
            //   89e1                 | mov                 ecx, esp
            //   03d0                 | add                 edx, eax
            //   e8????????           |                     
            //   eb0b                 | jmp                 0xd
            //   4c                   | dec                 esp

        $sequence_48 = { a3???????? 33c0 5e 8b4dfc }
            // n = 4, score = 100
            //   a3????????           |                     
            //   33c0                 | mov                 dword ptr [ebp - 0x84], 0
            //   5e                   | jmp                 0x11
            //   8b4dfc               | mov                 eax, dword ptr [ebp - 0x84]

        $sequence_49 = { 6a00 ff55dc 85c0 0f8496010000 }
            // n = 4, score = 100
            //   6a00                 | cli                 
            //   ff55dc               | cli                 
            //   85c0                 | cli                 
            //   0f8496010000         | cli                 

    condition:
        7 of them and filesize < 417792
}