rule win_waterspout_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.waterspout."
        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.waterspout"
        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 = { 68???????? 56 e8???????? 83c418 84c0 751e 6a01 }
            // n = 7, score = 200
            //   68????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   84c0                 | test                al, al
            //   751e                 | jne                 0x20
            //   6a01                 | push                1

        $sequence_1 = { 56 8d4c2420 8802 ff15???????? bf???????? 83c9ff }
            // n = 6, score = 200
            //   56                   | push                esi
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   8802                 | mov                 byte ptr [edx], al
            //   ff15????????         |                     
            //   bf????????           |                     
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_2 = { 88442424 32c3 50 e8???????? 8a4c2420 8ad3 32d1 }
            // n = 7, score = 200
            //   88442424             | mov                 byte ptr [esp + 0x24], al
            //   32c3                 | xor                 al, bl
            //   50                   | push                eax
            //   e8????????           |                     
            //   8a4c2420             | mov                 cl, byte ptr [esp + 0x20]
            //   8ad3                 | mov                 dl, bl
            //   32d1                 | xor                 dl, cl

        $sequence_3 = { 8bfb 83c418 8d4c3001 33c0 }
            // n = 4, score = 200
            //   8bfb                 | mov                 edi, ebx
            //   83c418               | add                 esp, 0x18
            //   8d4c3001             | lea                 ecx, [eax + esi + 1]
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 57 57 50 ff15???????? 85c0 7540 8b0e }
            // n = 7, score = 200
            //   57                   | push                edi
            //   57                   | push                edi
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7540                 | jne                 0x42
            //   8b0e                 | mov                 ecx, dword ptr [esi]

        $sequence_5 = { 83c408 8d4c2414 c744241430750000 6a04 51 }
            // n = 5, score = 200
            //   83c408               | add                 esp, 8
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   c744241430750000     | mov                 dword ptr [esp + 0x14], 0x7530
            //   6a04                 | push                4
            //   51                   | push                ecx

        $sequence_6 = { c68424be000000ac c68424bf00000062 c68424c000000091 c68424c100000095 c68424c2000000e4 }
            // n = 5, score = 200
            //   c68424be000000ac     | mov                 byte ptr [esp + 0xbe], 0xac
            //   c68424bf00000062     | mov                 byte ptr [esp + 0xbf], 0x62
            //   c68424c000000091     | mov                 byte ptr [esp + 0xc0], 0x91
            //   c68424c100000095     | mov                 byte ptr [esp + 0xc1], 0x95
            //   c68424c2000000e4     | mov                 byte ptr [esp + 0xc2], 0xe4

        $sequence_7 = { 8bb4240c200000 8d442410 6a00 50 6a00 6a00 6a00 }
            // n = 7, score = 200
            //   8bb4240c200000       | mov                 esi, dword ptr [esp + 0x200c]
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_8 = { 8dbc24ac030000 f3ab 8d442410 8d4c2418 50 8b842490630000 51 }
            // n = 7, score = 200
            //   8dbc24ac030000       | lea                 edi, [esp + 0x3ac]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   50                   | push                eax
            //   8b842490630000       | mov                 eax, dword ptr [esp + 0x6390]
            //   51                   | push                ecx

        $sequence_9 = { c644245ed6 c644245fb3 33db c644246029 c6442461e3 c64424622f c644246384 }
            // n = 7, score = 200
            //   c644245ed6           | mov                 byte ptr [esp + 0x5e], 0xd6
            //   c644245fb3           | mov                 byte ptr [esp + 0x5f], 0xb3
            //   33db                 | xor                 ebx, ebx
            //   c644246029           | mov                 byte ptr [esp + 0x60], 0x29
            //   c6442461e3           | mov                 byte ptr [esp + 0x61], 0xe3
            //   c64424622f           | mov                 byte ptr [esp + 0x62], 0x2f
            //   c644246384           | mov                 byte ptr [esp + 0x63], 0x84

    condition:
        7 of them and filesize < 98304
}