rule win_nspx30_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nspx30."
        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.nspx30"
        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 = { f3ab 66ab aa b06c }
            // n = 4, score = 200
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   b06c                 | mov                 al, 0x6c

        $sequence_1 = { 8b55e8 52 e8???????? 837d9400 }
            // n = 4, score = 100
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   52                   | push                edx
            //   e8????????           |                     
            //   837d9400             | cmp                 dword ptr [ebp - 0x6c], 0

        $sequence_2 = { 8d8594fdffff 50 ff15???????? 8d8d94fdffff 49 }
            // n = 5, score = 100
            //   8d8594fdffff         | lea                 eax, [ebp - 0x26c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d8d94fdffff         | lea                 ecx, [ebp - 0x26c]
            //   49                   | dec                 ecx

        $sequence_3 = { 1bc0 2500001000 83bb4c01000000 898350010000 745b }
            // n = 5, score = 100
            //   1bc0                 | sbb                 eax, eax
            //   2500001000           | and                 eax, 0x100000
            //   83bb4c01000000       | cmp                 dword ptr [ebx + 0x14c], 0
            //   898350010000         | mov                 dword ptr [ebx + 0x150], eax
            //   745b                 | je                  0x5d

        $sequence_4 = { 8b8308010000 03c1 8945f0 33d2 8bc7 }
            // n = 5, score = 100
            //   8b8308010000         | mov                 eax, dword ptr [ebx + 0x108]
            //   03c1                 | add                 eax, ecx
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   33d2                 | xor                 edx, edx
            //   8bc7                 | mov                 eax, edi

        $sequence_5 = { 57 8bca bf???????? 33db }
            // n = 4, score = 100
            //   57                   | push                edi
            //   8bca                 | mov                 ecx, edx
            //   bf????????           |                     
            //   33db                 | xor                 ebx, ebx

        $sequence_6 = { 683d270000 ff15???????? 83c8ff 5e c21400 6879270000 ff15???????? }
            // n = 7, score = 100
            //   683d270000           | push                0x273d
            //   ff15????????         |                     
            //   83c8ff               | or                  eax, 0xffffffff
            //   5e                   | pop                 esi
            //   c21400               | ret                 0x14
            //   6879270000           | push                0x2779
            //   ff15????????         |                     

        $sequence_7 = { 68c1000000 ff15???????? c745cc00000000 c745fcfeffffff 8b45cc e9???????? 8b45e4 }
            // n = 7, score = 100
            //   68c1000000           | push                0xc1
            //   ff15????????         |                     
            //   c745cc00000000       | mov                 dword ptr [ebp - 0x34], 0
            //   c745fcfeffffff       | mov                 dword ptr [ebp - 4], 0xfffffffe
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   e9????????           |                     
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]

        $sequence_8 = { 83c404 3bc3 89442410 0f8445010000 }
            // n = 4, score = 100
            //   83c404               | add                 esp, 4
            //   3bc3                 | cmp                 eax, ebx
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   0f8445010000         | je                  0x14b

        $sequence_9 = { 751e 8b442408 6804010000 68???????? 50 ff15???????? 85f6 }
            // n = 7, score = 100
            //   751e                 | jne                 0x20
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   6804010000           | push                0x104
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85f6                 | test                esi, esi

        $sequence_10 = { 837de000 7519 6a04 6800200000 8b55f0 8b4250 50 }
            // n = 7, score = 100
            //   837de000             | cmp                 dword ptr [ebp - 0x20], 0
            //   7519                 | jne                 0x1b
            //   6a04                 | push                4
            //   6800200000           | push                0x2000
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8b4250               | mov                 eax, dword ptr [edx + 0x50]
            //   50                   | push                eax

        $sequence_11 = { c644240975 50 52 c64424126e c644241364 c644241633 c644241732 }
            // n = 7, score = 100
            //   c644240975           | mov                 byte ptr [esp + 9], 0x75
            //   50                   | push                eax
            //   52                   | push                edx
            //   c64424126e           | mov                 byte ptr [esp + 0x12], 0x6e
            //   c644241364           | mov                 byte ptr [esp + 0x13], 0x64
            //   c644241633           | mov                 byte ptr [esp + 0x16], 0x33
            //   c644241732           | mov                 byte ptr [esp + 0x17], 0x32

        $sequence_12 = { 7502 eb20 8b4dfc c7411001000000 8b45fc eb17 }
            // n = 6, score = 100
            //   7502                 | jne                 4
            //   eb20                 | jmp                 0x22
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   c7411001000000       | mov                 dword ptr [ecx + 0x10], 1
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   eb17                 | jmp                 0x19

        $sequence_13 = { 0f8547ffffff 8bc6 8088c166001008 40 3dff000000 }
            // n = 5, score = 100
            //   0f8547ffffff         | jne                 0xffffff4d
            //   8bc6                 | mov                 eax, esi
            //   8088c166001008       | or                  byte ptr [eax + 0x100066c1], 8
            //   40                   | inc                 eax
            //   3dff000000           | cmp                 eax, 0xff

        $sequence_14 = { 7577 8b35???????? 8d94241c010000 68???????? 52 ffd6 }
            // n = 6, score = 100
            //   7577                 | jne                 0x79
            //   8b35????????         |                     
            //   8d94241c010000       | lea                 edx, [esp + 0x11c]
            //   68????????           |                     
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_15 = { 6a14 56 8974241c ff5510 85c0 0f85dd000000 8b460c }
            // n = 7, score = 100
            //   6a14                 | push                0x14
            //   56                   | push                esi
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   ff5510               | call                dword ptr [ebp + 0x10]
            //   85c0                 | test                eax, eax
            //   0f85dd000000         | jne                 0xe3
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]

        $sequence_16 = { aa 8d442404 50 51 e8???????? 83c408 85c0 }
            // n = 7, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d442404             | lea                 eax, [esp + 4]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_17 = { 8b7a38 85ff 7e4e 8b46fc 6a04 6800100000 }
            // n = 6, score = 100
            //   8b7a38               | mov                 edi, dword ptr [edx + 0x38]
            //   85ff                 | test                edi, edi
            //   7e4e                 | jle                 0x50
            //   8b46fc               | mov                 eax, dword ptr [esi - 4]
            //   6a04                 | push                4
            //   6800100000           | push                0x1000

        $sequence_18 = { 8d84241c010000 68ff000000 50 53 ff15???????? 8d8c241c010000 51 }
            // n = 7, score = 100
            //   8d84241c010000       | lea                 eax, [esp + 0x11c]
            //   68ff000000           | push                0xff
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8d8c241c010000       | lea                 ecx, [esp + 0x11c]
            //   51                   | push                ecx

        $sequence_19 = { 53 50 8b4610 03461c }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   50                   | push                eax
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   03461c               | add                 eax, dword ptr [esi + 0x1c]

        $sequence_20 = { 40 0fb6da f683c166001004 740c ff01 85f6 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   0fb6da               | movzx               ebx, dl
            //   f683c166001004       | test                byte ptr [ebx + 0x100066c1], 4
            //   740c                 | je                  0xe
            //   ff01                 | inc                 dword ptr [ecx]
            //   85f6                 | test                esi, esi

        $sequence_21 = { 8d8c2440010000 50 8d9424bc000000 51 52 }
            // n = 5, score = 100
            //   8d8c2440010000       | lea                 ecx, [esp + 0x140]
            //   50                   | push                eax
            //   8d9424bc000000       | lea                 edx, [esp + 0xbc]
            //   51                   | push                ecx
            //   52                   | push                edx

        $sequence_22 = { 5b 754a c7002c000000 895004 895008 }
            // n = 5, score = 100
            //   5b                   | pop                 ebx
            //   754a                 | jne                 0x4c
            //   c7002c000000         | mov                 dword ptr [eax], 0x2c
            //   895004               | mov                 dword ptr [eax + 4], edx
            //   895008               | mov                 dword ptr [eax + 8], edx

        $sequence_23 = { 83c004 83c504 89442410 8b4500 }
            // n = 4, score = 100
            //   83c004               | add                 eax, 4
            //   83c504               | add                 ebp, 4
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   8b4500               | mov                 eax, dword ptr [ebp]

        $sequence_24 = { 6689bc242a010000 668984242c010000 66c784242e0100003200 6689842430010000 6689bc2432010000 66c78424340100003500 }
            // n = 6, score = 100
            //   6689bc242a010000     | mov                 word ptr [esp + 0x12a], di
            //   668984242c010000     | mov                 word ptr [esp + 0x12c], ax
            //   66c784242e0100003200     | mov    word ptr [esp + 0x12e], 0x32
            //   6689842430010000     | mov                 word ptr [esp + 0x130], ax
            //   6689bc2432010000     | mov                 word ptr [esp + 0x132], di
            //   66c78424340100003500     | mov    word ptr [esp + 0x134], 0x35

        $sequence_25 = { 668b0410 6689444ffe 3bcb 72e8 ff15???????? 50 8b442420 }
            // n = 7, score = 100
            //   668b0410             | mov                 ax, word ptr [eax + edx]
            //   6689444ffe           | mov                 word ptr [edi + ecx*2 - 2], ax
            //   3bcb                 | cmp                 ecx, ebx
            //   72e8                 | jb                  0xffffffea
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_26 = { 7304 33c0 eb2a 8b4dfc 890d???????? }
            // n = 5, score = 100
            //   7304                 | jae                 6
            //   33c0                 | xor                 eax, eax
            //   eb2a                 | jmp                 0x2c
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   890d????????         |                     

        $sequence_27 = { 80780d00 7523 8d4900 397010 }
            // n = 4, score = 100
            //   80780d00             | cmp                 byte ptr [eax + 0xd], 0
            //   7523                 | jne                 0x25
            //   8d4900               | lea                 ecx, [ecx]
            //   397010               | cmp                 dword ptr [eax + 0x10], esi

        $sequence_28 = { 8dbc241e010000 66899c241c010000 f3ab 8d84241c010000 68ff000000 }
            // n = 5, score = 100
            //   8dbc241e010000       | lea                 edi, [esp + 0x11e]
            //   66899c241c010000     | mov                 word ptr [esp + 0x11c], bx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d84241c010000       | lea                 eax, [esp + 0x11c]
            //   68ff000000           | push                0xff

        $sequence_29 = { 56 57 33db b97f000000 33c0 8dbc241e010000 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   33db                 | xor                 ebx, ebx
            //   b97f000000           | mov                 ecx, 0x7f
            //   33c0                 | xor                 eax, eax
            //   8dbc241e010000       | lea                 edi, [esp + 0x11e]

    condition:
        7 of them and filesize < 3789824
}