rule win_etumbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.etumbot."
        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.etumbot"
        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 = { 8a00 02c2 0fb6c0 8a8405fcfeffff 320437 8806 }
            // n = 6, score = 400
            //   8a00                 | mov                 al, byte ptr [eax]
            //   02c2                 | add                 al, dl
            //   0fb6c0               | movzx               eax, al
            //   8a8405fcfeffff       | mov                 al, byte ptr [ebp + eax - 0x104]
            //   320437               | xor                 al, byte ptr [edi + esi]
            //   8806                 | mov                 byte ptr [esi], al

        $sequence_1 = { 57 8b3d???????? ffd7 8b7508 8bd8 }
            // n = 5, score = 300
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   ffd7                 | call                edi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   8bd8                 | mov                 ebx, eax

        $sequence_2 = { 7407 8bf9 c1ef18 33c7 }
            // n = 4, score = 300
            //   7407                 | je                  9
            //   8bf9                 | mov                 edi, ecx
            //   c1ef18               | shr                 edi, 0x18
            //   33c7                 | xor                 eax, edi

        $sequence_3 = { 3bc6 72ed 5f 5e 5b }
            // n = 5, score = 300
            //   3bc6                 | cmp                 eax, esi
            //   72ed                 | jb                  0xffffffef
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_4 = { c745c874566572 c745cc73696f6e c745d05c5c496e c745d47465726e }
            // n = 4, score = 300
            //   c745c874566572       | mov                 dword ptr [ebp - 0x38], 0x72655674
            //   c745cc73696f6e       | mov                 dword ptr [ebp - 0x34], 0x6e6f6973
            //   c745d05c5c496e       | mov                 dword ptr [ebp - 0x30], 0x6e495c5c
            //   c745d47465726e       | mov                 dword ptr [ebp - 0x2c], 0x6e726574

        $sequence_5 = { 8bf1 0fbe0a c1e004 03c1 8bc8 81e1000000f0 7407 }
            // n = 7, score = 300
            //   8bf1                 | mov                 esi, ecx
            //   0fbe0a               | movsx               ecx, byte ptr [edx]
            //   c1e004               | shl                 eax, 4
            //   03c1                 | add                 eax, ecx
            //   8bc8                 | mov                 ecx, eax
            //   81e1000000f0         | and                 ecx, 0xf0000000
            //   7407                 | je                  9

        $sequence_6 = { c745a877617265 c745ac5c5c4d69 c745b063726f73 c745b46f66745c c745b85c57696e }
            // n = 5, score = 300
            //   c745a877617265       | mov                 dword ptr [ebp - 0x58], 0x65726177
            //   c745ac5c5c4d69       | mov                 dword ptr [ebp - 0x54], 0x694d5c5c
            //   c745b063726f73       | mov                 dword ptr [ebp - 0x50], 0x736f7263
            //   c745b46f66745c       | mov                 dword ptr [ebp - 0x4c], 0x5c74666f
            //   c745b85c57696e       | mov                 dword ptr [ebp - 0x48], 0x6e69575c

        $sequence_7 = { 8d45f4 6820a10700 50 68???????? }
            // n = 4, score = 300
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   6820a10700           | push                0x7a120
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_8 = { c745b85c57696e c745bc646f7773 c745c05c5c4375 c745c47272656e c745c874566572 c745cc73696f6e }
            // n = 6, score = 300
            //   c745b85c57696e       | mov                 dword ptr [ebp - 0x48], 0x6e69575c
            //   c745bc646f7773       | mov                 dword ptr [ebp - 0x44], 0x73776f64
            //   c745c05c5c4375       | mov                 dword ptr [ebp - 0x40], 0x75435c5c
            //   c745c47272656e       | mov                 dword ptr [ebp - 0x3c], 0x6e657272
            //   c745c874566572       | mov                 dword ptr [ebp - 0x38], 0x72655674
            //   c745cc73696f6e       | mov                 dword ptr [ebp - 0x34], 0x6e6f6973

        $sequence_9 = { c745d05c5c496e c745d47465726e c745d865742053 c745dc65747469 }
            // n = 4, score = 300
            //   c745d05c5c496e       | mov                 dword ptr [ebp - 0x30], 0x6e495c5c
            //   c745d47465726e       | mov                 dword ptr [ebp - 0x2c], 0x6e726574
            //   c745d865742053       | mov                 dword ptr [ebp - 0x28], 0x53207465
            //   c745dc65747469       | mov                 dword ptr [ebp - 0x24], 0x69747465

        $sequence_10 = { 56 57 0fbe38 33f6 33db }
            // n = 5, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   0fbe38               | movsx               edi, byte ptr [eax]
            //   33f6                 | xor                 esi, esi
            //   33db                 | xor                 ebx, ebx

        $sequence_11 = { f7d1 23c1 42 4e 75df 5f }
            // n = 6, score = 300
            //   f7d1                 | not                 ecx
            //   23c1                 | and                 eax, ecx
            //   42                   | inc                 edx
            //   4e                   | dec                 esi
            //   75df                 | jne                 0xffffffe1
            //   5f                   | pop                 edi

        $sequence_12 = { ff15???????? ffd7 2bc3 3bc6 72ed }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   ffd7                 | call                edi
            //   2bc3                 | sub                 eax, ebx
            //   3bc6                 | cmp                 eax, esi
            //   72ed                 | jb                  0xffffffef

        $sequence_13 = { c1ef18 33c7 f7d1 23c1 }
            // n = 4, score = 300
            //   c1ef18               | shr                 edi, 0x18
            //   33c7                 | xor                 eax, edi
            //   f7d1                 | not                 ecx
            //   23c1                 | and                 eax, ecx

        $sequence_14 = { 8b4d08 83c101 894d08 8b550c 83ea03 }
            // n = 5, score = 200
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   83c101               | add                 ecx, 1
            //   894d08               | mov                 dword ptr [ebp + 8], ecx
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   83ea03               | sub                 edx, 3

        $sequence_15 = { 33c0 0fbe84c66ca14000 c1f804 83f807 8945d0 0f879a060000 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   0fbe84c66ca14000     | movsx               eax, byte ptr [esi + eax*8 + 0x40a16c]
            //   c1f804               | sar                 eax, 4
            //   83f807               | cmp                 eax, 7
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   0f879a060000         | ja                  0x6a0

        $sequence_16 = { a1???????? 57 83f801 7507 33c0 }
            // n = 5, score = 200
            //   a1????????           |                     
            //   57                   | push                edi
            //   83f801               | cmp                 eax, 1
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax

        $sequence_17 = { e8???????? ff35???????? 8bce e8???????? 8d45fc }
            // n = 5, score = 200
            //   e8????????           |                     
            //   ff35????????         |                     
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8d45fc               | lea                 eax, [ebp - 4]

        $sequence_18 = { 6a00 68???????? 6a00 6a00 6a00 51 68???????? }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   68????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   68????????           |                     

        $sequence_19 = { 8b4d08 034dec 8a11 8810 8b45f0 }
            // n = 5, score = 200
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   034dec               | add                 ecx, dword ptr [ebp - 0x14]
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   8810                 | mov                 byte ptr [eax], dl
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_20 = { bbd0070000 8bce e8???????? 83f801 }
            // n = 4, score = 200
            //   bbd0070000           | mov                 ebx, 0x7d0
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   83f801               | cmp                 eax, 1

        $sequence_21 = { 83c204 3b5514 7608 83c8ff }
            // n = 4, score = 200
            //   83c204               | add                 edx, 4
            //   3b5514               | cmp                 edx, dword ptr [ebp + 0x14]
            //   7608                 | jbe                 0xa
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_22 = { 83c404 8bd1 c1e902 f3ab 8bca 83e103 f3aa }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   8bd1                 | mov                 edx, ecx
            //   c1e902               | shr                 ecx, 2
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   f3aa                 | rep stosb           byte ptr es:[edi], al

        $sequence_23 = { c645c265 c645c33b c645c420 c645c54d c645c653 c645c749 }
            // n = 6, score = 200
            //   c645c265             | mov                 byte ptr [ebp - 0x3e], 0x65
            //   c645c33b             | mov                 byte ptr [ebp - 0x3d], 0x3b
            //   c645c420             | mov                 byte ptr [ebp - 0x3c], 0x20
            //   c645c54d             | mov                 byte ptr [ebp - 0x3b], 0x4d
            //   c645c653             | mov                 byte ptr [ebp - 0x3a], 0x53
            //   c645c749             | mov                 byte ptr [ebp - 0x39], 0x49

        $sequence_24 = { 53 53 53 8d4dec ff7508 51 }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   51                   | push                ecx

        $sequence_25 = { 83c104 3b4d14 7608 83c8ff }
            // n = 4, score = 200
            //   83c104               | add                 ecx, 4
            //   3b4d14               | cmp                 ecx, dword ptr [ebp + 0x14]
            //   7608                 | jbe                 0xa
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_26 = { c645bf69 c645c062 c645c16c c645c265 c645c33b c645c420 }
            // n = 6, score = 200
            //   c645bf69             | mov                 byte ptr [ebp - 0x41], 0x69
            //   c645c062             | mov                 byte ptr [ebp - 0x40], 0x62
            //   c645c16c             | mov                 byte ptr [ebp - 0x3f], 0x6c
            //   c645c265             | mov                 byte ptr [ebp - 0x3e], 0x65
            //   c645c33b             | mov                 byte ptr [ebp - 0x3d], 0x3b
            //   c645c420             | mov                 byte ptr [ebp - 0x3c], 0x20

        $sequence_27 = { c645d577 c645d673 c645d720 c645d84e c645d954 c645da20 }
            // n = 6, score = 200
            //   c645d577             | mov                 byte ptr [ebp - 0x2b], 0x77
            //   c645d673             | mov                 byte ptr [ebp - 0x2a], 0x73
            //   c645d720             | mov                 byte ptr [ebp - 0x29], 0x20
            //   c645d84e             | mov                 byte ptr [ebp - 0x28], 0x4e
            //   c645d954             | mov                 byte ptr [ebp - 0x27], 0x54
            //   c645da20             | mov                 byte ptr [ebp - 0x26], 0x20

        $sequence_28 = { c645c653 c645c749 c645c845 c645c920 }
            // n = 4, score = 200
            //   c645c653             | mov                 byte ptr [ebp - 0x3a], 0x53
            //   c645c749             | mov                 byte ptr [ebp - 0x39], 0x49
            //   c645c845             | mov                 byte ptr [ebp - 0x38], 0x45
            //   c645c920             | mov                 byte ptr [ebp - 0x37], 0x20

        $sequence_29 = { c645fa74 c645fb2e c645fc64 c645fd6c c645fe6c }
            // n = 5, score = 200
            //   c645fa74             | mov                 byte ptr [ebp - 6], 0x74
            //   c645fb2e             | mov                 byte ptr [ebp - 5], 0x2e
            //   c645fc64             | mov                 byte ptr [ebp - 4], 0x64
            //   c645fd6c             | mov                 byte ptr [ebp - 3], 0x6c
            //   c645fe6c             | mov                 byte ptr [ebp - 2], 0x6c

        $sequence_30 = { 8bce e8???????? 8d45c8 50 8d8528ebffff 50 e8???????? }
            // n = 7, score = 200
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   50                   | push                eax
            //   8d8528ebffff         | lea                 eax, [ebp - 0x14d8]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_31 = { 034df0 8b5508 0355ec 8a02 }
            // n = 4, score = 200
            //   034df0               | add                 ecx, dword ptr [ebp - 0x10]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0355ec               | add                 edx, dword ptr [ebp - 0x14]
            //   8a02                 | mov                 al, byte ptr [edx]

        $sequence_32 = { c645cf20 c645d057 c645d169 c645d26e }
            // n = 4, score = 200
            //   c645cf20             | mov                 byte ptr [ebp - 0x31], 0x20
            //   c645d057             | mov                 byte ptr [ebp - 0x30], 0x57
            //   c645d169             | mov                 byte ptr [ebp - 0x2f], 0x69
            //   c645d26e             | mov                 byte ptr [ebp - 0x2e], 0x6e

        $sequence_33 = { 8b45f4 0345f0 8b4d08 034dec }
            // n = 4, score = 200
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   0345f0               | add                 eax, dword ptr [ebp - 0x10]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   034dec               | add                 ecx, dword ptr [ebp - 0x14]

        $sequence_34 = { c645d057 c645d153 c645d241 c645d353 }
            // n = 4, score = 200
            //   c645d057             | mov                 byte ptr [ebp - 0x30], 0x57
            //   c645d153             | mov                 byte ptr [ebp - 0x2f], 0x53
            //   c645d241             | mov                 byte ptr [ebp - 0x2e], 0x41
            //   c645d353             | mov                 byte ptr [ebp - 0x2d], 0x53

        $sequence_35 = { 8bec b80c4d0000 e8???????? 53 56 8bf1 }
            // n = 6, score = 200
            //   8bec                 | mov                 ebp, esp
            //   b80c4d0000           | mov                 eax, 0x4d0c
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx

        $sequence_36 = { 52 e8???????? 83c404 e9???????? 6a05 }
            // n = 5, score = 200
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   e9????????           |                     
            //   6a05                 | push                5

        $sequence_37 = { 3bc2 0f835e010000 8a1c2e 8bd1 8d442410 2bd0 }
            // n = 6, score = 200
            //   3bc2                 | cmp                 eax, edx
            //   0f835e010000         | jae                 0x164
            //   8a1c2e               | mov                 bl, byte ptr [esi + ebp]
            //   8bd1                 | mov                 edx, ecx
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   2bd0                 | sub                 edx, eax

        $sequence_38 = { c645f569 c645f66e c645f769 c645f86e }
            // n = 4, score = 200
            //   c645f569             | mov                 byte ptr [ebp - 0xb], 0x69
            //   c645f66e             | mov                 byte ptr [ebp - 0xa], 0x6e
            //   c645f769             | mov                 byte ptr [ebp - 9], 0x69
            //   c645f86e             | mov                 byte ptr [ebp - 8], 0x6e

        $sequence_39 = { 80e10f c0e102 c0eb06 02cb }
            // n = 4, score = 200
            //   80e10f               | and                 cl, 0xf
            //   c0e102               | shl                 cl, 2
            //   c0eb06               | shr                 bl, 6
            //   02cb                 | add                 cl, bl

        $sequence_40 = { c68540fcfffffb c68541fcffffdb c68542fcffff41 c68543fcffff0f c68544fcffff4b c68545fcffff7b }
            // n = 6, score = 100
            //   c68540fcfffffb       | mov                 byte ptr [ebp - 0x3c0], 0xfb
            //   c68541fcffffdb       | mov                 byte ptr [ebp - 0x3bf], 0xdb
            //   c68542fcffff41       | mov                 byte ptr [ebp - 0x3be], 0x41
            //   c68543fcffff0f       | mov                 byte ptr [ebp - 0x3bd], 0xf
            //   c68544fcffff4b       | mov                 byte ptr [ebp - 0x3bc], 0x4b
            //   c68545fcffff7b       | mov                 byte ptr [ebp - 0x3bb], 0x7b

    condition:
        7 of them and filesize < 450560
}