rule win_brambul_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.brambul."
        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.brambul"
        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 = { 7e45 8b5c241c 8b6c2418 ff15???????? 2b442410 3d60ea0000 7734 }
            // n = 7, score = 100
            //   7e45                 | jle                 0x47
            //   8b5c241c             | mov                 ebx, dword ptr [esp + 0x1c]
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]
            //   ff15????????         |                     
            //   2b442410             | sub                 eax, dword ptr [esp + 0x10]
            //   3d60ea0000           | cmp                 eax, 0xea60
            //   7734                 | ja                  0x36

        $sequence_1 = { 8dbc37604bbbf6 8bf7 c1ee10 c1e710 0bf7 }
            // n = 5, score = 100
            //   8dbc37604bbbf6       | lea                 edi, [edi + esi - 0x944b4a0]
            //   8bf7                 | mov                 esi, edi
            //   c1ee10               | shr                 esi, 0x10
            //   c1e710               | shl                 edi, 0x10
            //   0bf7                 | or                  esi, edi

        $sequence_2 = { 8807 8b4d88 47 46 4a }
            // n = 5, score = 100
            //   8807                 | mov                 byte ptr [edi], al
            //   8b4d88               | mov                 ecx, dword ptr [ebp - 0x78]
            //   47                   | inc                 edi
            //   46                   | inc                 esi
            //   4a                   | dec                 edx

        $sequence_3 = { 8bd7 33d1 035054 8d9c13f87ca21f 8bd3 c1ea10 }
            // n = 6, score = 100
            //   8bd7                 | mov                 edx, edi
            //   33d1                 | xor                 edx, ecx
            //   035054               | add                 edx, dword ptr [eax + 0x54]
            //   8d9c13f87ca21f       | lea                 ebx, [ebx + edx + 0x1fa27cf8]
            //   8bd3                 | mov                 edx, ebx
            //   c1ea10               | shr                 edx, 0x10

        $sequence_4 = { 8d542414 50 51 52 8d842494030000 68???????? 50 }
            // n = 7, score = 100
            //   8d542414             | lea                 edx, [esp + 0x14]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   52                   | push                edx
            //   8d842494030000       | lea                 eax, [esp + 0x394]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_5 = { 8bb4247c010000 b980000000 8d5624 c6460873 8bfa f3ab }
            // n = 6, score = 100
            //   8bb4247c010000       | mov                 esi, dword ptr [esp + 0x17c]
            //   b980000000           | mov                 ecx, 0x80
            //   8d5624               | lea                 edx, [esi + 0x24]
            //   c6460873             | mov                 byte ptr [esi + 8], 0x73
            //   8bfa                 | mov                 edi, edx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_6 = { 33c9 8a4e01 8bf9 8d5703 }
            // n = 4, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   8a4e01               | mov                 cl, byte ptr [esi + 1]
            //   8bf9                 | mov                 edi, ecx
            //   8d5703               | lea                 edx, [edi + 3]

        $sequence_7 = { 8d542464 c744246400020000 52 f3a5 e8???????? }
            // n = 5, score = 100
            //   8d542464             | lea                 edx, [esp + 0x64]
            //   c744246400020000     | mov                 dword ptr [esp + 0x64], 0x200
            //   52                   | push                edx
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   e8????????           |                     

        $sequence_8 = { 8d942474010000 57 52 8bf0 ff15???????? }
            // n = 5, score = 100
            //   8d942474010000       | lea                 edx, [esp + 0x174]
            //   57                   | push                edi
            //   52                   | push                edx
            //   8bf0                 | mov                 esi, eax
            //   ff15????????         |                     

        $sequence_9 = { 762e 83cfff 2b7de4 03c7 8b7dd8 3bce 731f }
            // n = 7, score = 100
            //   762e                 | jbe                 0x30
            //   83cfff               | or                  edi, 0xffffffff
            //   2b7de4               | sub                 edi, dword ptr [ebp - 0x1c]
            //   03c7                 | add                 eax, edi
            //   8b7dd8               | mov                 edi, dword ptr [ebp - 0x28]
            //   3bce                 | cmp                 ecx, esi
            //   731f                 | jae                 0x21

        $sequence_10 = { 7509 8b8c85b049ffff eb02 33c9 8d8485b449ffff }
            // n = 5, score = 100
            //   7509                 | jne                 0xb
            //   8b8c85b049ffff       | mov                 ecx, dword ptr [ebp + eax*4 - 0xb650]
            //   eb02                 | jmp                 4
            //   33c9                 | xor                 ecx, ecx
            //   8d8485b449ffff       | lea                 eax, [ebp + eax*4 - 0xb64c]

        $sequence_11 = { 0f85ac000000 3bf9 7531 8d9d887fffff 3bc3 7427 }
            // n = 6, score = 100
            //   0f85ac000000         | jne                 0xb2
            //   3bf9                 | cmp                 edi, ecx
            //   7531                 | jne                 0x33
            //   8d9d887fffff         | lea                 ebx, [ebp - 0x8078]
            //   3bc3                 | cmp                 eax, ebx
            //   7427                 | je                  0x29

        $sequence_12 = { 66898dc0f5ffff 8d8dc4fdffff 8955dc 8945e0 51 8d9598e3ffff 68???????? }
            // n = 7, score = 100
            //   66898dc0f5ffff       | mov                 word ptr [ebp - 0xa40], cx
            //   8d8dc4fdffff         | lea                 ecx, [ebp - 0x23c]
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   51                   | push                ecx
            //   8d9598e3ffff         | lea                 edx, [ebp - 0x1c68]
            //   68????????           |                     

        $sequence_13 = { 3b85b849ffff 7316 8b4588 8d3438 8d85887fffff }
            // n = 5, score = 100
            //   3b85b849ffff         | cmp                 eax, dword ptr [ebp - 0xb648]
            //   7316                 | jae                 0x18
            //   8b4588               | mov                 eax, dword ptr [ebp - 0x78]
            //   8d3438               | lea                 esi, [eax + edi]
            //   8d85887fffff         | lea                 eax, [ebp - 0x8078]

        $sequence_14 = { 56 57 8b35???????? 85f6 741b }
            // n = 5, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b35????????         |                     
            //   85f6                 | test                esi, esi
            //   741b                 | je                  0x1d

        $sequence_15 = { 8b442424 8b4c2428 8d9d28030000 6804010000 53 }
            // n = 5, score = 100
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   8b4c2428             | mov                 ecx, dword ptr [esp + 0x28]
            //   8d9d28030000         | lea                 ebx, [ebp + 0x328]
            //   6804010000           | push                0x104
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 188416
}