rule win_dnespy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8a8547deffff 83c408 33c9 c785dcddffff00000000 c785e0ddffff07000000 66898dccddffff 84c0 }
            // n = 7, score = 200
            //   8a8547deffff         | mov                 al, byte ptr [ebp - 0x21b9]
            //   83c408               | add                 esp, 8
            //   33c9                 | xor                 ecx, ecx
            //   c785dcddffff00000000     | mov    dword ptr [ebp - 0x2224], 0
            //   c785e0ddffff07000000     | mov    dword ptr [ebp - 0x2220], 7
            //   66898dccddffff       | mov                 word ptr [ebp - 0x2234], cx
            //   84c0                 | test                al, al

        $sequence_1 = { 83c410 83f804 0f8590000000 8b442424 88442424 0facf808 6a08 }
            // n = 7, score = 200
            //   83c410               | add                 esp, 0x10
            //   83f804               | cmp                 eax, 4
            //   0f8590000000         | jne                 0x96
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   88442424             | mov                 byte ptr [esp + 0x24], al
            //   0facf808             | shrd                eax, edi, 8
            //   6a08                 | push                8

        $sequence_2 = { 85ff 0f8474010000 e8???????? 8986f8000000 89442410 c786ec00000078563412 }
            // n = 6, score = 200
            //   85ff                 | test                edi, edi
            //   0f8474010000         | je                  0x17a
            //   e8????????           |                     
            //   8986f8000000         | mov                 dword ptr [esi + 0xf8], eax
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   c786ec00000078563412     | mov    dword ptr [esi + 0xec], 0x12345678

        $sequence_3 = { 8be5 5d c20800 5f 5e c74344601f4500 32c0 }
            // n = 7, score = 200
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c74344601f4500       | mov                 dword ptr [ebx + 0x44], 0x451f60
            //   32c0                 | xor                 al, al

        $sequence_4 = { 8d8ddcd9ffff e8???????? 8b8574d9ffff c645fc00 83f810 722d 8b8d60d9ffff }
            // n = 7, score = 200
            //   8d8ddcd9ffff         | lea                 ecx, [ebp - 0x2624]
            //   e8????????           |                     
            //   8b8574d9ffff         | mov                 eax, dword ptr [ebp - 0x268c]
            //   c645fc00             | mov                 byte ptr [ebp - 4], 0
            //   83f810               | cmp                 eax, 0x10
            //   722d                 | jb                  0x2f
            //   8b8d60d9ffff         | mov                 ecx, dword ptr [ebp - 0x26a0]

        $sequence_5 = { 8b442440 8944242c 7514 3b442438 750e 837c242400 7507 }
            // n = 7, score = 200
            //   8b442440             | mov                 eax, dword ptr [esp + 0x40]
            //   8944242c             | mov                 dword ptr [esp + 0x2c], eax
            //   7514                 | jne                 0x16
            //   3b442438             | cmp                 eax, dword ptr [esp + 0x38]
            //   750e                 | jne                 0x10
            //   837c242400           | cmp                 dword ptr [esp + 0x24], 0
            //   7507                 | jne                 9

        $sequence_6 = { c1e807 8a8098c54400 0fb6c0 66ff848688090000 8b869c160000 8b4e78 48 }
            // n = 7, score = 200
            //   c1e807               | shr                 eax, 7
            //   8a8098c54400         | mov                 al, byte ptr [eax + 0x44c598]
            //   0fb6c0               | movzx               eax, al
            //   66ff848688090000     | inc                 word ptr [esi + eax*4 + 0x988]
            //   8b869c160000         | mov                 eax, dword ptr [esi + 0x169c]
            //   8b4e78               | mov                 ecx, dword ptr [esi + 0x78]
            //   48                   | dec                 eax

        $sequence_7 = { 3bf1 75f3 8b4c240c 83c8ff 49 3bc8 0f42c1 }
            // n = 7, score = 200
            //   3bf1                 | cmp                 esi, ecx
            //   75f3                 | jne                 0xfffffff5
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   83c8ff               | or                  eax, 0xffffffff
            //   49                   | dec                 ecx
            //   3bc8                 | cmp                 ecx, eax
            //   0f42c1               | cmovb               eax, ecx

        $sequence_8 = { 880e 8b75e8 3bdf 75b5 8b7dd0 8b4ddc 8b37 }
            // n = 7, score = 200
            //   880e                 | mov                 byte ptr [esi], cl
            //   8b75e8               | mov                 esi, dword ptr [ebp - 0x18]
            //   3bdf                 | cmp                 ebx, edi
            //   75b5                 | jne                 0xffffffb7
            //   8b7dd0               | mov                 edi, dword ptr [ebp - 0x30]
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8b37                 | mov                 esi, dword ptr [edi]

        $sequence_9 = { 7453 ffb5a0fbffff 0f57c0 660f1385c8fbffff ff15???????? 8985c4fbffff b802000000 }
            // n = 7, score = 200
            //   7453                 | je                  0x55
            //   ffb5a0fbffff         | push                dword ptr [ebp - 0x460]
            //   0f57c0               | xorps               xmm0, xmm0
            //   660f1385c8fbffff     | movlpd              qword ptr [ebp - 0x438], xmm0
            //   ff15????????         |                     
            //   8985c4fbffff         | mov                 dword ptr [ebp - 0x43c], eax
            //   b802000000           | mov                 eax, 2

    condition:
        7 of them and filesize < 794624
}