rule win_dnespy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.dnespy."
        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.dnespy"
        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 = { 51 e8???????? 0f108558ddffff 83c408 }
            // n = 4, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   0f108558ddffff       | movups              xmm0, xmmword ptr [ebp - 0x22a8]
            //   83c408               | add                 esp, 8

        $sequence_1 = { e8???????? 8b956cffffff 8845a7 83fa10 722f 8b8d58ffffff 42 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b956cffffff         | mov                 edx, dword ptr [ebp - 0x94]
            //   8845a7               | mov                 byte ptr [ebp - 0x59], al
            //   83fa10               | cmp                 edx, 0x10
            //   722f                 | jb                  0x31
            //   8b8d58ffffff         | mov                 ecx, dword ptr [ebp - 0xa8]
            //   42                   | inc                 edx

        $sequence_2 = { 894108 8bcb 8b4224 c1e908 89480c eb05 8bcb }
            // n = 7, score = 200
            //   894108               | mov                 dword ptr [ecx + 8], eax
            //   8bcb                 | mov                 ecx, ebx
            //   8b4224               | mov                 eax, dword ptr [edx + 0x24]
            //   c1e908               | shr                 ecx, 8
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   eb05                 | jmp                 7
            //   8bcb                 | mov                 ecx, ebx

        $sequence_3 = { 8d420c 8b8a60e9ffff 33c8 e8???????? 8b4af8 33c8 e8???????? }
            // n = 7, score = 200
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b8a60e9ffff         | mov                 ecx, dword ptr [edx - 0x16a0]
            //   33c8                 | xor                 ecx, eax
            //   e8????????           |                     
            //   8b4af8               | mov                 ecx, dword ptr [edx - 8]
            //   33c8                 | xor                 ecx, eax
            //   e8????????           |                     

        $sequence_4 = { 8d4590 c645fc0b 50 8bcf e8???????? 8b55a4 83fa10 }
            // n = 7, score = 200
            //   8d4590               | lea                 eax, [ebp - 0x70]
            //   c645fc0b             | mov                 byte ptr [ebp - 4], 0xb
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8b55a4               | mov                 edx, dword ptr [ebp - 0x5c]
            //   83fa10               | cmp                 edx, 0x10

        $sequence_5 = { 8b5d08 895dd8 c745d400000000 c7431000000000 c743140f000000 c60300 c745fc00000000 }
            // n = 7, score = 200
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   895dd8               | mov                 dword ptr [ebp - 0x28], ebx
            //   c745d400000000       | mov                 dword ptr [ebp - 0x2c], 0
            //   c7431000000000       | mov                 dword ptr [ebx + 0x10], 0
            //   c743140f000000       | mov                 dword ptr [ebx + 0x14], 0xf
            //   c60300               | mov                 byte ptr [ebx], 0
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0

        $sequence_6 = { 8b542414 83faff 0f83a0000000 8810 8bc5 0facc208 89542418 }
            // n = 7, score = 200
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   83faff               | cmp                 edx, -1
            //   0f83a0000000         | jae                 0xa6
            //   8810                 | mov                 byte ptr [eax], dl
            //   8bc5                 | mov                 eax, ebp
            //   0facc208             | shrd                edx, eax, 8
            //   89542418             | mov                 dword ptr [esp + 0x18], edx

        $sequence_7 = { 8d45e0 50 e8???????? 6a00 68???????? 68???????? 6a00 }
            // n = 7, score = 200
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a00                 | push                0
            //   68????????           |                     
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_8 = { 7711 7207 3dffff0000 7308 89442410 894c2424 6804040000 }
            // n = 7, score = 200
            //   7711                 | ja                  0x13
            //   7207                 | jb                  9
            //   3dffff0000           | cmp                 eax, 0xffff
            //   7308                 | jae                 0xa
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   894c2424             | mov                 dword ptr [esp + 0x24], ecx
            //   6804040000           | push                0x404

        $sequence_9 = { 5b 8be5 5d c20800 52 50 51 }
            // n = 7, score = 200
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   52                   | push                edx
            //   50                   | push                eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 794624
}