rule win_purplewave_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.purplewave."
        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.purplewave"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 5a 2bd0 eb02 8b17 668b460e 6623c1 668945fa }
            // n = 7, score = 400
            //   5a                   | pop                 edx
            //   2bd0                 | sub                 edx, eax
            //   eb02                 | jmp                 4
            //   8b17                 | mov                 edx, dword ptr [edi]
            //   668b460e             | mov                 ax, word ptr [esi + 0xe]
            //   6623c1               | and                 ax, cx
            //   668945fa             | mov                 word ptr [ebp - 6], ax

        $sequence_1 = { 8d4f08 e8???????? 8b45f0 8d4f50 83c048 50 }
            // n = 6, score = 400
            //   8d4f08               | lea                 ecx, [edi + 8]
            //   e8????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8d4f50               | lea                 ecx, [edi + 0x50]
            //   83c048               | add                 eax, 0x48
            //   50                   | push                eax

        $sequence_2 = { 8955fc 99 3955f8 7779 7204 3bd8 7773 }
            // n = 7, score = 400
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   99                   | cdq                 
            //   3955f8               | cmp                 dword ptr [ebp - 8], edx
            //   7779                 | ja                  0x7b
            //   7204                 | jb                  6
            //   3bd8                 | cmp                 ebx, eax
            //   7773                 | ja                  0x75

        $sequence_3 = { 895dec 8b75dc 8bda 8b7dd8 c645fc01 56 8bcb }
            // n = 7, score = 400
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx
            //   8b75dc               | mov                 esi, dword ptr [ebp - 0x24]
            //   8bda                 | mov                 ebx, edx
            //   8b7dd8               | mov                 edi, dword ptr [ebp - 0x28]
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   56                   | push                esi
            //   8bcb                 | mov                 ecx, ebx

        $sequence_4 = { 6aff 50 52 68e9fd0000 894df0 ff15???????? 8bd8 }
            // n = 7, score = 400
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   52                   | push                edx
            //   68e9fd0000           | push                0xfde9
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_5 = { 99 6a4c 59 f7f9 894d08 8945e8 8b4604 }
            // n = 7, score = 400
            //   99                   | cdq                 
            //   6a4c                 | push                0x4c
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx
            //   894d08               | mov                 dword ptr [ebp + 8], ecx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]

        $sequence_6 = { 2bc6 3bc8 7604 8bc2 eb08 8d040e 3bc2 }
            // n = 7, score = 400
            //   2bc6                 | sub                 eax, esi
            //   3bc8                 | cmp                 ecx, eax
            //   7604                 | jbe                 6
            //   8bc2                 | mov                 eax, edx
            //   eb08                 | jmp                 0xa
            //   8d040e               | lea                 eax, [esi + ecx]
            //   3bc2                 | cmp                 eax, edx

        $sequence_7 = { 8945cc 8a16 80fa30 7d9b eb0e 8bd0 e8???????? }
            // n = 7, score = 400
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   8a16                 | mov                 dl, byte ptr [esi]
            //   80fa30               | cmp                 dl, 0x30
            //   7d9b                 | jge                 0xffffff9d
            //   eb0e                 | jmp                 0x10
            //   8bd0                 | mov                 edx, eax
            //   e8????????           |                     

        $sequence_8 = { c20800 8b4de8 894dec 3bf3 741d }
            // n = 5, score = 400
            //   c20800               | ret                 8
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   3bf3                 | cmp                 esi, ebx
            //   741d                 | je                  0x1f

        $sequence_9 = { 56 e8???????? 83c40c 33c9 894e28 884e18 894e3c }
            // n = 7, score = 400
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   33c9                 | xor                 ecx, ecx
            //   894e28               | mov                 dword ptr [esi + 0x28], ecx
            //   884e18               | mov                 byte ptr [esi + 0x18], cl
            //   894e3c               | mov                 dword ptr [esi + 0x3c], ecx

    condition:
        7 of them and filesize < 1400832
}