rule win_spank_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.spank_rat."
        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.spank_rat"
        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 = { c7463000000000 895644 83f902 0f44cf 8d7a18 898be4020000 897e3c }
            // n = 7, score = 100
            //   c7463000000000       | mov                 dword ptr [esi + 0x30], 0
            //   895644               | mov                 dword ptr [esi + 0x44], edx
            //   83f902               | cmp                 ecx, 2
            //   0f44cf               | cmove               ecx, edi
            //   8d7a18               | lea                 edi, [edx + 0x18]
            //   898be4020000         | mov                 dword ptr [ebx + 0x2e4], ecx
            //   897e3c               | mov                 dword ptr [esi + 0x3c], edi

        $sequence_1 = { 885c3801 88543802 eb35 c1e812 897e2c 894e64 8b7e38 }
            // n = 7, score = 100
            //   885c3801             | mov                 byte ptr [eax + edi + 1], bl
            //   88543802             | mov                 byte ptr [eax + edi + 2], dl
            //   eb35                 | jmp                 0x37
            //   c1e812               | shr                 eax, 0x12
            //   897e2c               | mov                 dword ptr [esi + 0x2c], edi
            //   894e64               | mov                 dword ptr [esi + 0x64], ecx
            //   8b7e38               | mov                 edi, dword ptr [esi + 0x38]

        $sequence_2 = { e8???????? 58 8b8524feffff 8b8d28feffff 8b952cfeffff c745f003000000 8945cc }
            // n = 7, score = 100
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   8b8524feffff         | mov                 eax, dword ptr [ebp - 0x1dc]
            //   8b8d28feffff         | mov                 ecx, dword ptr [ebp - 0x1d8]
            //   8b952cfeffff         | mov                 edx, dword ptr [ebp - 0x1d4]
            //   c745f003000000       | mov                 dword ptr [ebp - 0x10], 3
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax

        $sequence_3 = { e8???????? 83c62c 89f1 e8???????? 5d c3 55 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c62c               | add                 esi, 0x2c
            //   89f1                 | mov                 ecx, esi
            //   e8????????           |                     
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_4 = { e8???????? 59 85c0 0f8561f8ffff 8d96d8020000 8d8e40010000 c702???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   0f8561f8ffff         | jne                 0xfffff867
            //   8d96d8020000         | lea                 edx, [esi + 0x2d8]
            //   8d8e40010000         | lea                 ecx, [esi + 0x140]
            //   c702????????         |                     

        $sequence_5 = { 8b5dac 8b55d4 8b4dc8 8b7ddc f20f1185dcfeffff f20f118dd4feffff f20f1195ccfeffff }
            // n = 7, score = 100
            //   8b5dac               | mov                 ebx, dword ptr [ebp - 0x54]
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   8b4dc8               | mov                 ecx, dword ptr [ebp - 0x38]
            //   8b7ddc               | mov                 edi, dword ptr [ebp - 0x24]
            //   f20f1185dcfeffff     | movsd               qword ptr [ebp - 0x124], xmm0
            //   f20f118dd4feffff     | movsd               qword ptr [ebp - 0x12c], xmm1
            //   f20f1195ccfeffff     | movsd               qword ptr [ebp - 0x134], xmm2

        $sequence_6 = { e8???????? 58 e9???????? 6a1a 5a b9???????? 68???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   e9????????           |                     
            //   6a1a                 | push                0x1a
            //   5a                   | pop                 edx
            //   b9????????           |                     
            //   68????????           |                     

        $sequence_7 = { f20f109600040000 8d8e88000000 8d9640010000 c686a500000000 f20f114808 f30f7e8e08040000 f20f1100 }
            // n = 7, score = 100
            //   f20f109600040000     | movsd               xmm2, qword ptr [esi + 0x400]
            //   8d8e88000000         | lea                 ecx, [esi + 0x88]
            //   8d9640010000         | lea                 edx, [esi + 0x140]
            //   c686a500000000       | mov                 byte ptr [esi + 0xa5], 0
            //   f20f114808           | movsd               qword ptr [eax + 8], xmm1
            //   f30f7e8e08040000     | movq                xmm1, qword ptr [esi + 0x408]
            //   f20f1100             | movsd               qword ptr [eax], xmm0

        $sequence_8 = { eb09 83665000 8b55c8 b104 0fb6c1 c1e608 8d8d44ffffff }
            // n = 7, score = 100
            //   eb09                 | jmp                 0xb
            //   83665000             | and                 dword ptr [esi + 0x50], 0
            //   8b55c8               | mov                 edx, dword ptr [ebp - 0x38]
            //   b104                 | mov                 cl, 4
            //   0fb6c1               | movzx               eax, cl
            //   c1e608               | shl                 esi, 8
            //   8d8d44ffffff         | lea                 ecx, [ebp - 0xbc]

        $sequence_9 = { c7460400000000 e9???????? 6a08 58 894604 c6460c06 e9???????? }
            // n = 7, score = 100
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   e9????????           |                     
            //   6a08                 | push                8
            //   58                   | pop                 eax
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   c6460c06             | mov                 byte ptr [esi + 0xc], 6
            //   e9????????           |                     

    condition:
        7 of them and filesize < 1803264
}