rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.neddnloader."
        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.neddnloader"
        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 = { e8???????? 2b5d10 83c40c 03df }
            // n = 4, score = 400
            //   e8????????           |                     
            //   2b5d10               | add                 edx, 2
            //   83c40c               | cmp                 ecx, ebx
            //   03df                 | jae                 0x20

        $sequence_1 = { 8bec 83e4f8 81ec10060000 a1???????? 33c4 }
            // n = 5, score = 400
            //   8bec                 | movzx               esi, word ptr [ecx]
            //   83e4f8               | inc                 ecx
            //   81ec10060000         | mov                 eax, ecx
            //   a1????????           |                     
            //   33c4                 | sub                 eax, dword ptr [ebp - 4]

        $sequence_2 = { 8b450c 8908 ff15???????? 8bc7 }
            // n = 4, score = 400
            //   8b450c               | cmp                 ax, si
            //   8908                 | jne                 0x24
            //   ff15????????         |                     
            //   8bc7                 | mov                 ecx, dword ptr [ebp - 8]

        $sequence_3 = { 0fb702 0fb731 663bc6 7506 83c102 83c202 3bcb }
            // n = 7, score = 400
            //   0fb702               | mov                 dword ptr [ebp + 0x7b0], eax
            //   0fb731               | dec                 eax
            //   663bc6               | mov                 esi, ecx
            //   7506                 | dec                 eax
            //   83c102               | mov                 ecx, esi
            //   83c202               | cmp                 eax, edi
            //   3bcb                 | jne                 0x56

        $sequence_4 = { 3bcf 72f0 8d43ff 3bc8 7311 0fb702 0fb731 }
            // n = 7, score = 400
            //   3bcf                 | dec                 eax
            //   72f0                 | mov                 ecx, eax
            //   8d43ff               | dec                 eax
            //   3bc8                 | lea                 edx, [0x4110]
            //   7311                 | dec                 eax
            //   0fb702               | mov                 ecx, esi
            //   0fb731               | mov                 edx, 0x100

        $sequence_5 = { ff15???????? 8b4df8 56 3bc8 }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   8b4df8               | lea                 eax, [ebx - 1]
            //   56                   | cmp                 ecx, eax
            //   3bc8                 | jae                 0x13

        $sequence_6 = { 8b03 8b5508 69c0b179379e c1e813 }
            // n = 4, score = 400
            //   8b03                 | mov                 eax, 0x1ff
            //   8b5508               | inc                 esp
            //   69c0b179379e         | mov                 byte ptr [ebp - 0x20], ah
            //   c1e813               | movzx               eax, word ptr [edx]

        $sequence_7 = { 41 8bc1 2b45fc 5f 5e }
            // n = 5, score = 400
            //   41                   | dec                 eax
            //   8bc1                 | mov                 dword ptr [esp + 0x20], eax
            //   2b45fc               | dec                 esp
            //   5f                   | lea                 eax, [ebp - 0x10]
            //   5e                   | mov                 edx, 0x100

        $sequence_8 = { 498bf8 488bea 4c8be1 85c0 7e57 448d68ff 488bf2 }
            // n = 7, score = 100
            //   498bf8               | and                 dword ptr [esp + 0x20], 0
            //   488bea               | dec                 eax
            //   4c8be1               | lea                 eax, [0xee99]
            //   85c0                 | dec                 ecx
            //   7e57                 | mov                 edi, eax
            //   448d68ff             | dec                 eax
            //   488bf2               | mov                 ebp, edx

        $sequence_9 = { 488bce e8???????? 3bc7 7554 }
            // n = 4, score = 100
            //   488bce               | mov                 dword ptr [esp + ebx*4 + 0x1b090], eax
            //   e8????????           |                     
            //   3bc7                 | inc                 ecx
            //   7554                 | mov                 eax, dword ptr [esp + ecx*4 + 0x15580]

        $sequence_10 = { 4881ecc0080000 488b05???????? 4833c4 488985b0070000 488bf1 }
            // n = 5, score = 100
            //   4881ecc0080000       | add                 eax, dword ptr [edi]
            //   488b05????????       |                     
            //   4833c4               | inc                 ecx
            //   488985b0070000       | mov                 eax, dword ptr [esp + ecx*4 + 0x15180]
            //   488bf1               | inc                 ecx

        $sequence_11 = { 488905???????? ff15???????? 488bc8 ff15???????? 488d1510410000 488bce 488905???????? }
            // n = 7, score = 100
            //   488905????????       |                     
            //   ff15????????         |                     
            //   488bc8               | inc                 ecx
            //   ff15????????         |                     
            //   488d1510410000       | mov                 dword ptr [esp + ebx*4 + 0x1ac90], eax
            //   488bce               | inc                 ecx
            //   488905????????       |                     

        $sequence_12 = { 0f8c05010000 837c244c00 4c8b642450 0f84c5000000 488364242000 488d0599ee0000 }
            // n = 6, score = 100
            //   0f8c05010000         | jl                  0x10b
            //   837c244c00           | cmp                 dword ptr [esp + 0x4c], 0
            //   4c8b642450           | dec                 esp
            //   0f84c5000000         | mov                 esp, dword ptr [esp + 0x50]
            //   488364242000         | je                  0xcb
            //   488d0599ee0000       | dec                 eax

        $sequence_13 = { 894ff8 e8???????? eb49 8b4704 0307 }
            // n = 5, score = 100
            //   894ff8               | dec                 esp
            //   e8????????           |                     
            //   eb49                 | mov                 esp, ecx
            //   8b4704               | test                eax, eax
            //   0307                 | jle                 0x5e

        $sequence_14 = { ba00010000 4889442420 e8???????? 4c8d45f0 ba00010000 488bcf }
            // n = 6, score = 100
            //   ba00010000           | mov                 eax, dword ptr [esp + ecx*4 + 0x15980]
            //   4889442420           | inc                 ecx
            //   e8????????           |                     
            //   4c8d45f0             | mov                 dword ptr [esp + ebx*4 + 0x1b890], eax
            //   ba00010000           | dec                 ecx
            //   488bcf               | add                 ebx, ebp

        $sequence_15 = { 418b848c80510100 4189849c90b00100 418b848c80550100 4189849c90ac0100 418b848c80590100 4189849c90b80100 4903dd }
            // n = 7, score = 100
            //   418b848c80510100     | inc                 esp
            //   4189849c90b00100     | lea                 ebp, [eax - 1]
            //   418b848c80550100     | dec                 eax
            //   4189849c90ac0100     | mov                 esi, edx
            //   418b848c80590100     | mov                 dword ptr [edi - 8], ecx
            //   4189849c90b80100     | jmp                 0x4e
            //   4903dd               | mov                 eax, dword ptr [edi + 4]

    condition:
        7 of them and filesize < 3438592
}