rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { ffd7 ff7354 8bf8 ff7508 57 e8???????? 8b4d08 }
            // n = 7, score = 200
            //   ffd7                 | call                edi
            //   ff7354               | push                dword ptr [ebx + 0x54]
            //   8bf8                 | mov                 edi, eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_1 = { ffb58cf7ffff 89b594f7ffff ff15???????? 85c0 0f85fcfeffff }
            // n = 5, score = 200
            //   ffb58cf7ffff         | push                dword ptr [ebp - 0x874]
            //   89b594f7ffff         | mov                 dword ptr [ebp - 0x86c], esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85fcfeffff         | jne                 0xffffff02

        $sequence_2 = { 8b7510 8b7d0c 83451010 836dfc10 8345f810 4b a5 }
            // n = 7, 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
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]

        $sequence_3 = { 59 8bf2 8d7c2428 f3a5 8b4c2430 83e10f }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   8bf2                 | mov                 esi, edx
            //   8d7c2428             | lea                 edi, dword ptr [esp + 0x28]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8b4c2430             | mov                 ecx, dword ptr [esp + 0x30]
            //   83e10f               | and                 ecx, 0xf

        $sequence_4 = { 8b4334 8b3d???????? 6a04 6800300000 56 50 }
            // n = 6, score = 200
            //   8b4334               | mov                 eax, dword ptr [ebx + 0x34]
            //   8b3d????????         |                     
            //   6a04                 | push                4
            //   6800300000           | push                0x3000
            //   56                   | push                esi
            //   50                   | push                eax

        $sequence_5 = { 3bdf 1bc0 f7d8 3975fc 1bc9 f7d9 85c1 }
            // n = 7, score = 200
            //   3bdf                 | cmp                 ebx, edi
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax
            //   3975fc               | cmp                 dword ptr [ebp - 4], esi
            //   1bc9                 | sbb                 ecx, ecx
            //   f7d9                 | neg                 ecx
            //   85c1                 | test                ecx, eax

        $sequence_6 = { 66ab aa 0f846d010000 85f6 0f8465010000 }
            // n = 5, score = 200
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   0f846d010000         | je                  0x173
            //   85f6                 | test                esi, esi
            //   0f8465010000         | je                  0x16b

        $sequence_7 = { 8bd9 8975f8 8b75f0 c1ee18 }
            // n = 4, score = 200
            //   8bd9                 | mov                 ebx, ecx
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   8b75f0               | mov                 esi, dword ptr [ebp - 0x10]
            //   c1ee18               | shr                 esi, 0x18

        $sequence_8 = { ffb5e0fbffff e8???????? 85c0 7410 8b85f0fbffff 8985e8fbffff }
            // n = 6, score = 200
            //   ffb5e0fbffff         | push                dword ptr [ebp - 0x420]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   8b85f0fbffff         | mov                 eax, dword ptr [ebp - 0x410]
            //   8985e8fbffff         | mov                 dword ptr [ebp - 0x418], eax

        $sequence_9 = { 6a04 6800100000 53 50 ff571c 83c414 85c0 }
            // n = 7, score = 200
            //   6a04                 | push                4
            //   6800100000           | push                0x1000
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff571c               | call                dword ptr [edi + 0x1c]
            //   83c414               | add                 esp, 0x14
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 237568
}