rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 0f8783000000 3bfa 731b 52 8bce }
            // n = 5, score = 200
            //   0f8783000000         | ja                  0x89
            //   3bfa                 | cmp                 edi, edx
            //   731b                 | jae                 0x1d
            //   52                   | push                edx
            //   8bce                 | mov                 ecx, esi

        $sequence_1 = { 8b45ec 8b4dfc ff45fc eb05 }
            // n = 4, score = 200
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   ff45fc               | inc                 dword ptr [ebp - 4]
            //   eb05                 | jmp                 7

        $sequence_2 = { ffd6 8b442420 eb02 33c0 8b8c24b4020000 5f 5e }
            // n = 7, score = 200
            //   ffd6                 | call                esi
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   8b8c24b4020000       | mov                 ecx, dword ptr [esp + 0x2b4]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { 0fb70c07 6685c9 740a 668908 83c002 }
            // n = 5, score = 200
            //   0fb70c07             | movzx               ecx, word ptr [edi + eax]
            //   6685c9               | test                cx, cx
            //   740a                 | je                  0xc
            //   668908               | mov                 word ptr [eax], cx
            //   83c002               | add                 eax, 2

        $sequence_4 = { 33c0 befe010000 56 50 6689842418040000 8d84241a040000 50 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   befe010000           | mov                 esi, 0x1fe
            //   56                   | push                esi
            //   50                   | push                eax
            //   6689842418040000     | mov                 word ptr [esp + 0x418], ax
            //   8d84241a040000       | lea                 eax, [esp + 0x41a]
            //   50                   | push                eax

        $sequence_5 = { 85c0 7454 ff7730 8b46fc 0345fc 6a04 6800100000 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7454                 | je                  0x56
            //   ff7730               | push                dword ptr [edi + 0x30]
            //   8b46fc               | mov                 eax, dword ptr [esi - 4]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   6a04                 | push                4
            //   6800100000           | push                0x1000

        $sequence_6 = { 8b02 8b4024 c3 55 8bec 51 57 }
            // n = 7, score = 200
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   8b4024               | mov                 eax, dword ptr [eax + 0x24]
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   57                   | push                edi

        $sequence_7 = { 81f9ff000000 74e8 8b4db4 8b55b8 03d1 3bd1 0f82df000000 }
            // n = 7, score = 200
            //   81f9ff000000         | cmp                 ecx, 0xff
            //   74e8                 | je                  0xffffffea
            //   8b4db4               | mov                 ecx, dword ptr [ebp - 0x4c]
            //   8b55b8               | mov                 edx, dword ptr [ebp - 0x48]
            //   03d1                 | add                 edx, ecx
            //   3bd1                 | cmp                 edx, ecx
            //   0f82df000000         | jb                  0xe5

        $sequence_8 = { 0f8e06010000 6a10 58 8bf3 83e60f }
            // n = 5, score = 200
            //   0f8e06010000         | jle                 0x10c
            //   6a10                 | push                0x10
            //   58                   | pop                 eax
            //   8bf3                 | mov                 esi, ebx
            //   83e60f               | and                 esi, 0xf

        $sequence_9 = { 3bc6 7217 8b07 3b06 7511 8b4514 ff4514 }
            // n = 7, score = 200
            //   3bc6                 | cmp                 eax, esi
            //   7217                 | jb                  0x19
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   3b06                 | cmp                 eax, dword ptr [esi]
            //   7511                 | jne                 0x13
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   ff4514               | inc                 dword ptr [ebp + 0x14]

    condition:
        7 of them and filesize < 237568
}