rule win_tapaoux_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.tapaoux."
        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.tapaoux"
        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 = { 8945d0 0f879a060000 ff24850e580010 834df0ff 8955cc 8955d8 8955e0 }
            // n = 7, score = 100
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   0f879a060000         | ja                  0x6a0
            //   ff24850e580010       | jmp                 dword ptr [eax*4 + 0x1000580e]
            //   834df0ff             | or                  dword ptr [ebp - 0x10], 0xffffffff
            //   8955cc               | mov                 dword ptr [ebp - 0x34], edx
            //   8955d8               | mov                 dword ptr [ebp - 0x28], edx
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx

        $sequence_1 = { f3ab aa 8d44240c 8d8c2418080000 50 51 c744241400040000 }
            // n = 7, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   8d8c2418080000       | lea                 ecx, [esp + 0x818]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   c744241400040000     | mov                 dword ptr [esp + 0x14], 0x400

        $sequence_2 = { 2bc8 83c0fd 50 8d2c39 8d8c2494000000 }
            // n = 5, score = 100
            //   2bc8                 | sub                 ecx, eax
            //   83c0fd               | add                 eax, -3
            //   50                   | push                eax
            //   8d2c39               | lea                 ebp, [ecx + edi]
            //   8d8c2494000000       | lea                 ecx, [esp + 0x94]

        $sequence_3 = { 8d9424d0020000 51 50 52 57 e8???????? }
            // n = 6, score = 100
            //   8d9424d0020000       | lea                 edx, [esp + 0x2d0]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   52                   | push                edx
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_4 = { 83c40c 85c0 0f8c4fffffff 8b942418010000 5f 8902 }
            // n = 6, score = 100
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f8c4fffffff         | jl                  0xffffff55
            //   8b942418010000       | mov                 edx, dword ptr [esp + 0x118]
            //   5f                   | pop                 edi
            //   8902                 | mov                 dword ptr [edx], eax

        $sequence_5 = { 81ec1c020000 53 56 8bb42428020000 57 85f6 0f8410010000 }
            // n = 7, score = 100
            //   81ec1c020000         | sub                 esp, 0x21c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bb42428020000       | mov                 esi, dword ptr [esp + 0x228]
            //   57                   | push                edi
            //   85f6                 | test                esi, esi
            //   0f8410010000         | je                  0x116

        $sequence_6 = { 8d7c2411 f3ab 8b8c2414010000 66ab 3bcb aa 750e }
            // n = 7, score = 100
            //   8d7c2411             | lea                 edi, [esp + 0x11]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8b8c2414010000       | mov                 ecx, dword ptr [esp + 0x114]
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   3bcb                 | cmp                 ecx, ebx
            //   aa                   | stosb               byte ptr es:[edi], al
            //   750e                 | jne                 0x10

        $sequence_7 = { 894c2418 83c9ff f2ae f7d1 49 55 }
            // n = 6, score = 100
            //   894c2418             | mov                 dword ptr [esp + 0x18], ecx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   55                   | push                ebp

        $sequence_8 = { 8d34bd50bb0110 7529 55 bd???????? 55 ffd3 }
            // n = 6, score = 100
            //   8d34bd50bb0110       | lea                 esi, [edi*4 + 0x1001bb50]
            //   7529                 | jne                 0x2b
            //   55                   | push                ebp
            //   bd????????           |                     
            //   55                   | push                ebp
            //   ffd3                 | call                ebx

        $sequence_9 = { 85c0 0f84c6000000 be???????? 8d442410 8a10 8aca 3a16 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f84c6000000         | je                  0xcc
            //   be????????           |                     
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   8aca                 | mov                 cl, dl
            //   3a16                 | cmp                 dl, byte ptr [esi]

    condition:
        7 of them and filesize < 292864
}