rule win_vyveva_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.vyveva."
        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.vyveva"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 89742418 88460c e8???????? 50 8f00 394004 7408 }
            // n = 7, score = 100
            //   89742418             | mov                 dword ptr [esp + 0x18], esi
            //   88460c               | mov                 byte ptr [esi + 0xc], al
            //   e8????????           |                     
            //   50                   | push                eax
            //   8f00                 | pop                 dword ptr [eax]
            //   394004               | cmp                 dword ptr [eax + 4], eax
            //   7408                 | je                  0xa

        $sequence_1 = { c644242097 c644242159 aa e8???????? 8d942488000000 52 68???????? }
            // n = 7, score = 100
            //   c644242097           | mov                 byte ptr [esp + 0x20], 0x97
            //   c644242159           | mov                 byte ptr [esp + 0x21], 0x59
            //   aa                   | stosb               byte ptr es:[edi], al
            //   e8????????           |                     
            //   8d942488000000       | lea                 edx, [esp + 0x88]
            //   52                   | push                edx
            //   68????????           |                     

        $sequence_2 = { 83ec04 5a 83c50a 50 8f02 668b442438 51 }
            // n = 7, score = 100
            //   83ec04               | sub                 esp, 4
            //   5a                   | pop                 edx
            //   83c50a               | add                 ebp, 0xa
            //   50                   | push                eax
            //   8f02                 | pop                 dword ptr [edx]
            //   668b442438           | mov                 ax, word ptr [esp + 0x38]
            //   51                   | push                ecx

        $sequence_3 = { 8b8e90000000 6a00 41 6a10 898e90000000 51 51 }
            // n = 7, score = 100
            //   8b8e90000000         | mov                 ecx, dword ptr [esi + 0x90]
            //   6a00                 | push                0
            //   41                   | inc                 ecx
            //   6a10                 | push                0x10
            //   898e90000000         | mov                 dword ptr [esi + 0x90], ecx
            //   51                   | push                ecx
            //   51                   | push                ecx

        $sequence_4 = { c74424fc00000000 014424fc 83ec04 2bc1 58 722c 8d4c246c }
            // n = 7, score = 100
            //   c74424fc00000000     | mov                 dword ptr [esp - 4], 0
            //   014424fc             | add                 dword ptr [esp - 4], eax
            //   83ec04               | sub                 esp, 4
            //   2bc1                 | sub                 eax, ecx
            //   58                   | pop                 eax
            //   722c                 | jb                  0x2e
            //   8d4c246c             | lea                 ecx, [esp + 0x6c]

        $sequence_5 = { 58 ff7004 59 897914 ff7604 5a 8b7204 }
            // n = 7, score = 100
            //   58                   | pop                 eax
            //   ff7004               | push                dword ptr [eax + 4]
            //   59                   | pop                 ecx
            //   897914               | mov                 dword ptr [ecx + 0x14], edi
            //   ff7604               | push                dword ptr [esi + 4]
            //   5a                   | pop                 edx
            //   8b7204               | mov                 esi, dword ptr [edx + 4]

        $sequence_6 = { 56 8f4034 e8???????? ff7534 59 33c0 8d440644 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8f4034               | pop                 dword ptr [eax + 0x34]
            //   e8????????           |                     
            //   ff7534               | push                dword ptr [ebp + 0x34]
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   8d440644             | lea                 eax, [esi + eax + 0x44]

        $sequence_7 = { 1bc0 2480 0500010000 50 5b 53 6a1d }
            // n = 7, score = 100
            //   1bc0                 | sbb                 eax, eax
            //   2480                 | and                 al, 0x80
            //   0500010000           | add                 eax, 0x100
            //   50                   | push                eax
            //   5b                   | pop                 ebx
            //   53                   | push                ebx
            //   6a1d                 | push                0x1d

        $sequence_8 = { fec9 5f 8848ff 895e04 895e08 53 8f460c }
            // n = 7, score = 100
            //   fec9                 | dec                 cl
            //   5f                   | pop                 edi
            //   8848ff               | mov                 byte ptr [eax - 1], cl
            //   895e04               | mov                 dword ptr [esi + 4], ebx
            //   895e08               | mov                 dword ptr [esi + 8], ebx
            //   53                   | push                ebx
            //   8f460c               | pop                 dword ptr [esi + 0xc]

        $sequence_9 = { 57 8b460c 85c0 0f8402010000 33c0 034604 3b08 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax
            //   0f8402010000         | je                  0x108
            //   33c0                 | xor                 eax, eax
            //   034604               | add                 eax, dword ptr [esi + 4]
            //   3b08                 | cmp                 ecx, dword ptr [eax]

    condition:
        7 of them and filesize < 360448
}