rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        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 = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 85db 7e57 8b450c 2bc1 4b 56 c1eb04 }
            // n = 7, score = 200
            //   85db                 | test                ebx, ebx
            //   7e57                 | jle                 0x59
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   2bc1                 | sub                 eax, ecx
            //   4b                   | dec                 ebx
            //   56                   | push                esi
            //   c1eb04               | shr                 ebx, 4

        $sequence_1 = { 894dc4 894dcc 8945d0 8975d4 c745d803000000 394d0c 7518 }
            // n = 7, score = 200
            //   894dc4               | mov                 dword ptr [ebp - 0x3c], ecx
            //   894dcc               | mov                 dword ptr [ebp - 0x34], ecx
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   8975d4               | mov                 dword ptr [ebp - 0x2c], esi
            //   c745d803000000       | mov                 dword ptr [ebp - 0x28], 3
            //   394d0c               | cmp                 dword ptr [ebp + 0xc], ecx
            //   7518                 | jne                 0x1a

        $sequence_2 = { ff75f8 ff75fc e8???????? 2bdf 83c40c 035dfc e9???????? }
            // n = 7, score = 200
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   2bdf                 | sub                 ebx, edi
            //   83c40c               | add                 esp, 0xc
            //   035dfc               | add                 ebx, dword ptr [ebp - 4]
            //   e9????????           |                     

        $sequence_3 = { 51 c785dcf5ffff03000000 89bde4f5ffff ffd3 57 57 6a5f }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   c785dcf5ffff03000000     | mov    dword ptr [ebp - 0xa24], 3
            //   89bde4f5ffff         | mov                 dword ptr [ebp - 0xa1c], edi
            //   ffd3                 | call                ebx
            //   57                   | push                edi
            //   57                   | push                edi
            //   6a5f                 | push                0x5f

        $sequence_4 = { 51 57 8945e0 e8???????? 8b45e0 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   57                   | push                edi
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   e8????????           |                     
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]

        $sequence_5 = { 8b06 3b07 7511 8b4514 ff4514 8945f4 c60000 }
            // n = 7, score = 200
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   3b07                 | cmp                 eax, dword ptr [edi]
            //   7511                 | jne                 0x13
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   ff4514               | inc                 dword ptr [ebp + 0x14]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   c60000               | mov                 byte ptr [eax], 0

        $sequence_6 = { c1c009 03c2 8945fc 8bde f7d3 23da 23c6 }
            // n = 7, score = 200
            //   c1c009               | rol                 eax, 9
            //   03c2                 | add                 eax, edx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8bde                 | mov                 ebx, esi
            //   f7d3                 | not                 ebx
            //   23da                 | and                 ebx, edx
            //   23c6                 | and                 eax, esi

        $sequence_7 = { 837dfc54 7309 56 ff15???????? eb27 8b4d0c 8d45f8 }
            // n = 7, score = 200
            //   837dfc54             | cmp                 dword ptr [ebp - 4], 0x54
            //   7309                 | jae                 0xb
            //   56                   | push                esi
            //   ff15????????         |                     
            //   eb27                 | jmp                 0x29
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8d45f8               | lea                 eax, dword ptr [ebp - 8]

        $sequence_8 = { 33c0 e9???????? 83fe0d 0f8c0b020000 8b03 8b4d08 69c0b179379e }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   83fe0d               | cmp                 esi, 0xd
            //   0f8c0b020000         | jl                  0x211
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   69c0b179379e         | imul                eax, eax, 0x9e3779b1

        $sequence_9 = { 56 57 889c249c020000 8dbc249d020000 ab }
            // n = 5, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   889c249c020000       | mov                 byte ptr [esp + 0x29c], bl
            //   8dbc249d020000       | lea                 edi, dword ptr [esp + 0x29d]
            //   ab                   | stosd               dword ptr es:[edi], eax

    condition:
        7 of them and filesize < 237568
}