rule win_purplewave_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { c20400 e8???????? 85c0 0f8440a40000 c3 833d????????ff 7503 }
            // n = 7, score = 400
            //   c20400               | ret                 4
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8440a40000         | je                  0xa446
            //   c3                   | ret                 
            //   833d????????ff       |                     
            //   7503                 | jne                 5

        $sequence_1 = { c3 8b853cffffff 2500100000 0f8415000000 81a53cffffffffefffff 8d8d08ffffff }
            // n = 6, score = 400
            //   c3                   | ret                 
            //   8b853cffffff         | mov                 eax, dword ptr [ebp - 0xc4]
            //   2500100000           | and                 eax, 0x1000
            //   0f8415000000         | je                  0x1b
            //   81a53cffffffffefffff     | and    dword ptr [ebp - 0xc4], 0xffffefff
            //   8d8d08ffffff         | lea                 ecx, [ebp - 0xf8]

        $sequence_2 = { ff75d0 e8???????? eb15 807dd700 7426 8b45c4 8b4dac }
            // n = 7, score = 400
            //   ff75d0               | push                dword ptr [ebp - 0x30]
            //   e8????????           |                     
            //   eb15                 | jmp                 0x17
            //   807dd700             | cmp                 byte ptr [ebp - 0x29], 0
            //   7426                 | je                  0x28
            //   8b45c4               | mov                 eax, dword ptr [ebp - 0x3c]
            //   8b4dac               | mov                 ecx, dword ptr [ebp - 0x54]

        $sequence_3 = { a1???????? 83664c00 83663800 894640 a1???????? 894644 6a02 }
            // n = 7, score = 400
            //   a1????????           |                     
            //   83664c00             | and                 dword ptr [esi + 0x4c], 0
            //   83663800             | and                 dword ptr [esi + 0x38], 0
            //   894640               | mov                 dword ptr [esi + 0x40], eax
            //   a1????????           |                     
            //   894644               | mov                 dword ptr [esi + 0x44], eax
            //   6a02                 | push                2

        $sequence_4 = { 8d4da0 e8???????? 8d8d20ffffff e8???????? 8d8d18ffffff e8???????? 8d4d88 }
            // n = 7, score = 400
            //   8d4da0               | lea                 ecx, [ebp - 0x60]
            //   e8????????           |                     
            //   8d8d20ffffff         | lea                 ecx, [ebp - 0xe0]
            //   e8????????           |                     
            //   8d8d18ffffff         | lea                 ecx, [ebp - 0xe8]
            //   e8????????           |                     
            //   8d4d88               | lea                 ecx, [ebp - 0x78]

        $sequence_5 = { e8???????? 8d8de4feffff 885dfc e8???????? 8b9544ffffff 8d8de4feffff e8???????? }
            // n = 7, score = 400
            //   e8????????           |                     
            //   8d8de4feffff         | lea                 ecx, [ebp - 0x11c]
            //   885dfc               | mov                 byte ptr [ebp - 4], bl
            //   e8????????           |                     
            //   8b9544ffffff         | mov                 edx, dword ptr [ebp - 0xbc]
            //   8d8de4feffff         | lea                 ecx, [ebp - 0x11c]
            //   e8????????           |                     

        $sequence_6 = { e9???????? 8b85dcfeffff 83e001 0f8412000000 83a5dcfefffffe 8b8dbcfeffff e9???????? }
            // n = 7, score = 400
            //   e9????????           |                     
            //   8b85dcfeffff         | mov                 eax, dword ptr [ebp - 0x124]
            //   83e001               | and                 eax, 1
            //   0f8412000000         | je                  0x18
            //   83a5dcfefffffe       | and                 dword ptr [ebp - 0x124], 0xfffffffe
            //   8b8dbcfeffff         | mov                 ecx, dword ptr [ebp - 0x144]
            //   e9????????           |                     

        $sequence_7 = { 8b048d201e4900 5a 8854072c 8b45e4 8bf0 eb13 6a0a }
            // n = 7, score = 400
            //   8b048d201e4900       | mov                 eax, dword ptr [ecx*4 + 0x491e20]
            //   5a                   | pop                 edx
            //   8854072c             | mov                 byte ptr [edi + eax + 0x2c], dl
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8bf0                 | mov                 esi, eax
            //   eb13                 | jmp                 0x15
            //   6a0a                 | push                0xa

        $sequence_8 = { ff75e8 ff75f0 e8???????? 8b45f4 5f 5e 5b }
            // n = 7, score = 400
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_9 = { e8???????? 6a0e e8???????? 83c40c 8d8c24a8000000 8bd0 c7003519ef54 }
            // n = 7, score = 400
            //   e8????????           |                     
            //   6a0e                 | push                0xe
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d8c24a8000000       | lea                 ecx, [esp + 0xa8]
            //   8bd0                 | mov                 edx, eax
            //   c7003519ef54         | mov                 dword ptr [eax], 0x54ef1935

    condition:
        7 of them and filesize < 1400832
}