rule win_volgmer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.volgmer."
        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.volgmer"
        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 = { e8???????? 8bd7 c6843d1015000000 488d8d10150000 e8???????? 488d9510150000 488bce }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8bd7                 | add                 dword ptr [ebx + 0x14], edx
            //   c6843d1015000000     | test                eax, eax
            //   488d8d10150000       | jne                 0xfffffd6b
            //   e8????????           |                     
            //   488d9510150000       | test                esi, esi
            //   488bce               | jne                 0xffffff8d

        $sequence_1 = { 448bc7 488d8da0070000 4c8bf0 e8???????? 8bd7 c6843da007000000 488d8da0070000 }
            // n = 7, score = 200
            //   448bc7               | dec                 eax
            //   488d8da0070000       | mov                 ecx, dword ptr [ebx + 0x270]
            //   4c8bf0               | dec                 eax
            //   e8????????           |                     
            //   8bd7                 | mov                 ebp, dword ptr [ebx + 0x128]
            //   c6843da007000000     | dec                 eax
            //   488d8da0070000       | test                ecx, ecx

        $sequence_2 = { 84c0 75f0 488d542430 488d8dc0050000 ff542420 488bd8 }
            // n = 6, score = 200
            //   84c0                 | jmp                 0x1f
            //   75f0                 | lea                 eax, [esp + 0x10]
            //   488d542430           | push                0x10
            //   488d8dc0050000       | push                eax
            //   ff542420             | push                0xff52
            //   488bd8               | add                 esp, 8

        $sequence_3 = { 8d4b41 888c24a0000000 488d8c24a0000000 41ffd6 8bcf }
            // n = 5, score = 200
            //   8d4b41               | test                esi, esi
            //   888c24a0000000       | jne                 0xffffff8b
            //   488d8c24a0000000     | cmp                 dword ptr [ebp + 0x4c], edx
            //   41ffd6               | mov                 eax, dword ptr [ebx + 0x6c]
            //   8bcf                 | add                 dword ptr [esi + 0x14], edx

        $sequence_4 = { 4885c0 7419 33d2 488bc8 41ffd5 }
            // n = 5, score = 200
            //   4885c0               | jle                 0x29
            //   7419                 | add                 esi, eax
            //   33d2                 | mov                 eax, dword ptr [ebp]
            //   488bc8               | push                edi
            //   41ffd5               | push                0x104

        $sequence_5 = { 4533c0 498bd5 33c9 c744242800000008 }
            // n = 4, score = 200
            //   4533c0               | inc                 ebp
            //   498bd5               | xor                 eax, eax
            //   33c9                 | dec                 ecx
            //   c744242800000008     | mov                 edx, ebp

        $sequence_6 = { 33d2 0fb705???????? 41b8c1000000 0f1185d8090000 668985180a0000 0f2805???????? 0fb605???????? }
            // n = 7, score = 200
            //   33d2                 | test                eax, eax
            //   0fb705????????       |                     
            //   41b8c1000000         | je                  0x31
            //   0f1185d8090000       | mov                 ecx, dword ptr [esp + 0x18]
            //   668985180a0000       | test                eax, eax
            //   0f2805????????       |                     
            //   0fb605????????       |                     

        $sequence_7 = { 8d14c7 eb05 ba40000200 44894c2420 448bc6 }
            // n = 5, score = 200
            //   8d14c7               | jne                 0xffffff8d
            //   eb05                 | cmp                 dword ptr [ebp + 0x4c], edx
            //   ba40000200           | add                 dword ptr [ebx + 0x14], edx
            //   44894c2420           | test                eax, eax
            //   448bc6               | jne                 0xfffffd69

        $sequence_8 = { ff542468 488b4580 488d8da0040000 ffd0 }
            // n = 4, score = 200
            //   ff542468             | add                 dword ptr [ebx + 0x14], edx
            //   488b4580             | test                eax, eax
            //   488d8da0040000       | jne                 0xfffffd6b
            //   ffd0                 | test                esi, esi

        $sequence_9 = { e8???????? e8???????? e8???????? c705????????04000000 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   c705????????04000000     |     

        $sequence_10 = { 57 6804010000 6a40 ff15???????? 6800020000 }
            // n = 5, score = 100
            //   57                   | add                 dword ptr [ebx + 0x14], ecx
            //   6804010000           | cmp                 dword ptr [ebx + 0x48], esi
            //   6a40                 | je                  0x1d
            //   ff15????????         |                     
            //   6800020000           | dec                 eax

        $sequence_11 = { 015314 85c0 0f8563fdffff 85f6 }
            // n = 4, score = 100
            //   015314               | inc                 ecx
            //   85c0                 | mov                 eax, edx
            //   0f8563fdffff         | rol                 eax, 5
            //   85f6                 | add                 dword ptr [ecx + 8], eax

        $sequence_12 = { 3b4b3b 52 3b5e3b 6a3b }
            // n = 4, score = 100
            //   3b4b3b               | inc                 ecx
            //   52                   | mov                 eax, 0xc1
            //   3b5e3b               | movups              xmmword ptr [ebp + 0x9d8], xmm0
            //   6a3b                 | mov                 word ptr [ebp + 0xa18], ax

        $sequence_13 = { 66a3???????? c705????????02000000 5d eb7e 6a00 6a00 }
            // n = 6, score = 100
            //   66a3????????         |                     
            //   c705????????02000000     |     
            //   5d                   | cmp                 dword ptr [ebx + 0x48], esi
            //   eb7e                 | je                  0x15
            //   6a00                 | dec                 eax
            //   6a00                 | mov                 ecx, ebx

        $sequence_14 = { eb1d 8b0d???????? 8d442410 6a10 50 6852ff0000 }
            // n = 6, score = 100
            //   eb1d                 | inc                 ecx
            //   8b0d????????         |                     
            //   8d442410             | add                 eax, ebp
            //   6a10                 | add                 edi, esi
            //   50                   | add                 dword ptr [ebx + 0x14], ecx
            //   6852ff0000           | cmp                 dword ptr [ebx + 0x48], esi

        $sequence_15 = { 8d45d0 8a10 3a11 751a 84d2 7412 }
            // n = 6, score = 100
            //   8d45d0               | xor                 eax, eax
            //   8a10                 | dec                 ecx
            //   3a11                 | mov                 edx, ebp
            //   751a                 | xor                 ecx, ecx
            //   84d2                 | mov                 dword ptr [esp + 0x28], 0x8000000
            //   7412                 | inc                 eax

        $sequence_16 = { 4053 4883ec20 488d0d7be50100 ff15???????? 488bd8 4885c0 }
            // n = 6, score = 100
            //   4053                 | push                0
            //   4883ec20             | mov                 ebx, 5
            //   488d0d7be50100       | mov                 byte ptr [ecx + 4], al
            //   ff15????????         |                     
            //   488bd8               | jmp                 0x40
            //   4885c0               | mov                 ecx, dword ptr [esp + 0x24]

        $sequence_17 = { 008a01010000 488b4708 440fb68001010000 0fb69000010000 4803d0 }
            // n = 5, score = 100
            //   008a01010000         | xor                 ecx, ecx
            //   488b4708             | mov                 dword ptr [esp + 0x28], 0x8000000
            //   440fb68001010000     | add                 byte ptr [edx + 0x101], cl
            //   0fb69000010000       | dec                 eax
            //   4803d0               | mov                 eax, dword ptr [edi + 8]

        $sequence_18 = { 014108 448b4108 418bc2 c1c005 }
            // n = 4, score = 100
            //   014108               | add                 edx, eax
            //   448b4108             | dec                 esp
            //   418bc2               | add                 eax, eax
            //   c1c005               | movzx               ecx, byte ptr [edx]

        $sequence_19 = { 448bc7 e8???????? 85c0 7447 807c243017 7540 b801030000 }
            // n = 7, score = 100
            //   448bc7               | dec                 eax
            //   e8????????           |                     
            //   85c0                 | lea                 ecx, [esp + 0xa0]
            //   7447                 | inc                 ecx
            //   807c243017           | call                esi
            //   7540                 | mov                 ecx, edi
            //   b801030000           | inc                 esp

        $sequence_20 = { e8???????? eb32 53 e8???????? 83c404 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   eb32                 | mov                 ecx, ebx
            //   53                   | mov                 eax, dword ptr [ebx + 0x48]
            //   e8????????           |                     
            //   83c404               | add                 dword ptr [ebx + 0x14], ecx

        $sequence_21 = { 85c0 7e25 03f0 8b4500 }
            // n = 4, score = 100
            //   85c0                 | cmp                 dword ptr [ebx + 0x48], esi
            //   7e25                 | je                  0x12
            //   03f0                 | dec                 eax
            //   8b4500               | mov                 ecx, ebx

        $sequence_22 = { 0f85d1010000 33ff 83c303 6a2f }
            // n = 4, score = 100
            //   0f85d1010000         | lea                 ecx, [ebp + 0x7a0]
            //   33ff                 | test                al, al
            //   83c303               | jne                 0xfffffff4
            //   6a2f                 | dec                 eax

        $sequence_23 = { 0f284da0 bb48000000 0f114702 0f114f12 0f2845b0 0f284dc0 }
            // n = 6, score = 100
            //   0f284da0             | mov                 ecx, esi
            //   bb48000000           | call                dword ptr [esp + 0x68]
            //   0f114702             | dec                 eax
            //   0f114f12             | mov                 eax, dword ptr [ebp - 0x80]
            //   0f2845b0             | dec                 eax
            //   0f284dc0             | lea                 ecx, [ebp + 0x4a0]

        $sequence_24 = { 488d542470 448bcf e8???????? 4c8b35???????? }
            // n = 4, score = 100
            //   488d542470           | add                 ecx, 4
            //   448bcf               | mov                 edx, edi
            //   e8????????           |                     
            //   4c8b35????????       |                     

        $sequence_25 = { 0101 44015104 4c8b942498000000 8b01 }
            // n = 4, score = 100
            //   0101                 | inc                 esp
            //   44015104             | movzx               eax, byte ptr [eax + 0x101]
            //   4c8b942498000000     | movzx               edx, byte ptr [eax + 0x100]
            //   8b01                 | dec                 eax

        $sequence_26 = { c1fb06 83e03f 6bd030 895de4 8b049d80f16e00 }
            // n = 5, score = 100
            //   c1fb06               | dec                 esp
            //   83e03f               | sub                 eax, eax
            //   6bd030               | dec                 eax
            //   895de4               | test                edx, edx
            //   8b049d80f16e00       | je                  0x2b

        $sequence_27 = { eb7c c745e0e0ba6e00 ebbb d9e8 8b4510 dd18 }
            // n = 6, score = 100
            //   eb7c                 | movaps              xmm1, xmmword ptr [ebp - 0x60]
            //   c745e0e0ba6e00       | mov                 ebx, 0x48
            //   ebbb                 | movups              xmmword ptr [edi + 2], xmm0
            //   d9e8                 | movups              xmmword ptr [edi + 0x12], xmm1
            //   8b4510               | movaps              xmm0, xmmword ptr [ebp - 0x50]
            //   dd18                 | movaps              xmm1, xmmword ptr [ebp - 0x40]

        $sequence_28 = { e9???????? c745dc02000000 c745e0e4ba6e00 8b4508 8bcf }
            // n = 5, score = 100
            //   e9????????           |                     
            //   c745dc02000000       | dec                 esp
            //   c745e0e4ba6e00       | cmove               eax, eax
            //   8b4508               | mov                 eax, dword ptr [ebx + 0x1c]
            //   8bcf                 | pop                 edi

        $sequence_29 = { 668945e8 8b45d4 886de5 8b148580f16e00 8a4c1a2d }
            // n = 5, score = 100
            //   668945e8             | dec                 esp
            //   8b45d4               | add                 ecx, eax
            //   886de5               | dec                 eax
            //   8b148580f16e00       | lea                 eax, [0x11beb]
            //   8a4c1a2d             | test                edi, edi

        $sequence_30 = { c74048b8e46e00 8b4508 6689486c 8b4508 66898872010000 }
            // n = 5, score = 100
            //   c74048b8e46e00       | mov                 eax, edi
            //   8b4508               | test                eax, eax
            //   6689486c             | je                  0x49
            //   8b4508               | cmp                 byte ptr [esp + 0x30], 0x17
            //   66898872010000       | jne                 0x49

        $sequence_31 = { 6a00 50 e8???????? 6800010000 8d8318030000 6a00 }
            // n = 6, score = 100
            //   6a00                 | movzx               eax, byte ptr [ecx]
            //   50                   | mov                 byte ptr [ecx + esi + 2], al
            //   e8????????           |                     
            //   6800010000           | dec                 eax
            //   8d8318030000         | lea                 ecx, [ecx + 1]
            //   6a00                 | inc                 ebp

        $sequence_32 = { 0fb68418240e0000 02c2 02f0 0fb6ce }
            // n = 4, score = 100
            //   0fb68418240e0000     | dec                 eax
            //   02c2                 | test                eax, eax
            //   02f0                 | je                  0x1e
            //   0fb6ce               | xor                 edx, edx

        $sequence_33 = { 014b14 397348 7410 488bcb }
            // n = 4, score = 100
            //   014b14               | mov                 eax, dword ptr [ecx]
            //   397348               | mov                 ecx, dword ptr [ecx + 4]
            //   7410                 | inc                 ebp
            //   488bcb               | mov                 dword ptr [edx + 8], eax

        $sequence_34 = { 83c408 85c0 742f 8b4c2418 }
            // n = 4, score = 100
            //   83c408               | je                  0x15
            //   85c0                 | dec                 eax
            //   742f                 | mov                 ecx, ebx
            //   8b4c2418             | add                 dword ptr [ebx + 0x14], ecx

        $sequence_35 = { d9c9 d9f1 833d????????00 0f859c190000 8d0d90b86e00 }
            // n = 5, score = 100
            //   d9c9                 | dec                 esp
            //   d9f1                 | lea                 eax, [0x104f5]
            //   833d????????00       |                     
            //   0f859c190000         | dec                 eax
            //   8d0d90b86e00         | lea                 edx, [ecx + edx + 0x7ffffbfe]

        $sequence_36 = { 5f 5e c3 0fb74c2449 48896c2440 }
            // n = 5, score = 100
            //   5f                   | mov                 dword ptr [esp + 0x20], ecx
            //   5e                   | inc                 esp
            //   c3                   | mov                 eax, esi
            //   0fb74c2449           | lea                 ecx, [ebx + 0x41]
            //   48896c2440           | mov                 byte ptr [esp + 0xa0], cl

        $sequence_37 = { 39b139cf3909 3a10 3a17 3a31 3a9a3aa43ab2 3ab73ac33ad2 3ade }
            // n = 7, score = 100
            //   39b139cf3909         | lea                 edx, [esp + 0x30]
            //   3a10                 | dec                 eax
            //   3a17                 | lea                 ecx, [ebp + 0x5c0]
            //   3a31                 | call                dword ptr [esp + 0x20]
            //   3a9a3aa43ab2         | dec                 eax
            //   3ab73ac33ad2         | mov                 ebx, eax
            //   3ade                 | xor                 edx, edx

        $sequence_38 = { c7430c00000000 57 c7430800000000 894314 e8???????? }
            // n = 5, score = 100
            //   c7430c00000000       | mov                 esi, eax
            //   57                   | mov                 edx, edi
            //   c7430800000000       | mov                 byte ptr [ebp + edi + 0x7a0], 0
            //   894314               | dec                 eax
            //   e8????????           |                     

        $sequence_39 = { 4c03c8 488d05eb1b0100 85ff 4c0f44c0 8b431c }
            // n = 5, score = 100
            //   4c03c8               | call                eax
            //   488d05eb1b0100       | lea                 edx, [edi + eax*8]
            //   85ff                 | jmp                 0xa
            //   4c0f44c0             | mov                 edx, 0x20040
            //   8b431c               | inc                 esp

        $sequence_40 = { 8bc3 8d95f0fdffff c1e009 8d8870f66e00 2bd1 0f1f840000000000 }
            // n = 6, score = 100
            //   8bc3                 | pop                 esi
            //   8d95f0fdffff         | ret                 
            //   c1e009               | movzx               ecx, word ptr [esp + 0x49]
            //   8d8870f66e00         | dec                 eax
            //   2bd1                 | mov                 dword ptr [esp + 0x40], ebp
            //   0f1f840000000000     | inc                 esp

        $sequence_41 = { 83c8f0 40 8985c4f5ffff 8d95d0f9ffff c1e009 }
            // n = 5, score = 100
            //   83c8f0               | dec                 eax
            //   40                   | mov                 ecx, eax
            //   8985c4f5ffff         | inc                 ecx
            //   8d95d0f9ffff         | call                ebp
            //   c1e009               | nop                 dword ptr [eax + eax]

        $sequence_42 = { f30f7e0e 83e908 8d7608 660fd60f 8d7f08 8b048dd4926d00 }
            // n = 6, score = 100
            //   f30f7e0e             | test                eax, eax
            //   83e908               | dec                 eax
            //   8d7608               | lea                 edx, [esp + 0x70]
            //   660fd60f             | inc                 esp
            //   8d7f08               | mov                 ecx, edi
            //   8b048dd4926d00       | je                  0x39

        $sequence_43 = { 7437 4c8d05f5040100 488d9411fefbff7f 4c2bc0 4885d2 741b }
            // n = 6, score = 100
            //   7437                 | mov                 byte ptr [ebp + edi + 0x1510], 0
            //   4c8d05f5040100       | dec                 eax
            //   488d9411fefbff7f     | lea                 ecx, [ebp + 0x1510]
            //   4c2bc0               | dec                 eax
            //   4885d2               | lea                 edx, [ebp + 0x1510]
            //   741b                 | dec                 eax

    condition:
        7 of them and filesize < 393216
}