rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 0f843d010000 56 53 ff74241c e8???????? 8bd8 83c40c }
            // n = 7, score = 200
            //   0f843d010000         | je                  0x143
            //   56                   | push                esi
            //   53                   | push                ebx
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 3b4c2438 0f853a010000 8d4254 50 8d9c2490020000 89442420 }
            // n = 6, score = 200
            //   3b4c2438             | cmp                 ecx, dword ptr [esp + 0x38]
            //   0f853a010000         | jne                 0x140
            //   8d4254               | lea                 eax, dword ptr [edx + 0x54]
            //   50                   | push                eax
            // 
            //   89442420             | mov                 dword ptr [esp + 0x20], eax

        $sequence_2 = { 74a5 8d85fcefffff 50 ba???????? 8bcf e8???????? }
            // n = 6, score = 200
            //   74a5                 | je                  0xffffffa7
            //   8d85fcefffff         | lea                 eax, dword ptr [ebp - 0x1004]
            //   50                   | push                eax
            //   ba????????           |                     
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_3 = { 8975e4 8945e8 894dbc 894dc0 894dc4 }
            // n = 5, score = 200
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   894dbc               | mov                 dword ptr [ebp - 0x44], ecx
            //   894dc0               | mov                 dword ptr [ebp - 0x40], ecx
            //   894dc4               | mov                 dword ptr [ebp - 0x3c], ecx

        $sequence_4 = { 8b7510 8b7d0c 83451010 836dfc10 8345f810 4b }
            // n = 6, score = 200
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   83451010             | add                 dword ptr [ebp + 0x10], 0x10
            //   836dfc10             | sub                 dword ptr [ebp - 4], 0x10
            //   8345f810             | add                 dword ptr [ebp - 8], 0x10
            //   4b                   | dec                 ebx

        $sequence_5 = { 2975f0 ff4d08 75f8 8b45f0 eb05 8ac3 c0e004 }
            // n = 7, score = 200
            //   2975f0               | sub                 dword ptr [ebp - 0x10], esi
            //   ff4d08               | dec                 dword ptr [ebp + 8]
            //   75f8                 | jne                 0xfffffffa
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   eb05                 | jmp                 7
            //   8ac3                 | mov                 al, bl
            //   c0e004               | shl                 al, 4

        $sequence_6 = { 56 ff15???????? 8b95f4fbffff 8bc8 }
            // n = 4, score = 200
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8b95f4fbffff         | mov                 edx, dword ptr [ebp - 0x40c]
            //   8bc8                 | mov                 ecx, eax

        $sequence_7 = { 83fe0d 0f8cef010000 8b03 8b5508 }
            // n = 4, score = 200
            //   83fe0d               | cmp                 esi, 0xd
            //   0f8cef010000         | jl                  0x1f5
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]

        $sequence_8 = { 0f8737010000 8b4dac 8d041e 83c1f8 89459c 3bc1 0f8723010000 }
            // n = 7, score = 200
            //   0f8737010000         | ja                  0x13d
            //   8b4dac               | mov                 ecx, dword ptr [ebp - 0x54]
            //   8d041e               | lea                 eax, dword ptr [esi + ebx]
            //   83c1f8               | add                 ecx, -8
            //   89459c               | mov                 dword ptr [ebp - 0x64], eax
            //   3bc1                 | cmp                 eax, ecx
            //   0f8723010000         | ja                  0x129

        $sequence_9 = { 23d8 8bce 8945e0 895de4 e8???????? 8365f000 8945e8 }
            // n = 7, score = 200
            //   23d8                 | and                 ebx, eax
            //   8bce                 | mov                 ecx, esi
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   e8????????           |                     
            //   8365f000             | and                 dword ptr [ebp - 0x10], 0
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax

    condition:
        7 of them and filesize < 237568
}