rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 0facc81e 50 8d856cffffff 50 }
            // n = 4, score = 200
            //   0facc81e             | shrd                eax, ecx, 0x1e
            //   50                   | push                eax
            //   8d856cffffff         | lea                 eax, [ebp - 0x94]
            //   50                   | push                eax

        $sequence_1 = { 68???????? e8???????? 83c41c 6800020000 8d85fcfbffff }
            // n = 5, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   6800020000           | push                0x200
            //   8d85fcfbffff         | lea                 eax, [ebp - 0x404]

        $sequence_2 = { 8b06 8907 8b4604 894704 83c608 }
            // n = 5, score = 200
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8907                 | mov                 dword ptr [edi], eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   83c608               | add                 esi, 8

        $sequence_3 = { b9ff000000 f7f1 03d8 8813 43 895dfc eb02 }
            // n = 7, score = 200
            //   b9ff000000           | mov                 ecx, 0xff
            //   f7f1                 | div                 ecx
            //   03d8                 | add                 ebx, eax
            //   8813                 | mov                 byte ptr [ebx], dl
            //   43                   | inc                 ebx
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   eb02                 | jmp                 4

        $sequence_4 = { 7217 8b06 3b07 7511 8b45fc ff45fc }
            // n = 6, score = 200
            //   7217                 | jb                  0x19
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   3b07                 | cmp                 eax, dword ptr [edi]
            //   7511                 | jne                 0x13
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   ff45fc               | inc                 dword ptr [ebp - 4]

        $sequence_5 = { 337008 c1e918 8975ec c1eb08 }
            // n = 4, score = 200
            //   337008               | xor                 esi, dword ptr [eax + 8]
            //   c1e918               | shr                 ecx, 0x18
            //   8975ec               | mov                 dword ptr [ebp - 0x14], esi
            //   c1eb08               | shr                 ebx, 8

        $sequence_6 = { e9???????? 57 8bb880000000 6a14 03fb 57 }
            // n = 6, score = 200
            //   e9????????           |                     
            //   57                   | push                edi
            //   8bb880000000         | mov                 edi, dword ptr [eax + 0x80]
            //   6a14                 | push                0x14
            //   03fb                 | add                 edi, ebx
            //   57                   | push                edi

        $sequence_7 = { 51 51 53 8bd8 85db 7e57 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx
            //   7e57                 | jle                 0x59

        $sequence_8 = { 8bf8 0345ec ff45f0 8955ec 8b55f8 83c2f4 8945e4 }
            // n = 7, score = 200
            //   8bf8                 | mov                 edi, eax
            //   0345ec               | add                 eax, dword ptr [ebp - 0x14]
            //   ff45f0               | inc                 dword ptr [ebp - 0x10]
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   83c2f4               | add                 edx, -0xc
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_9 = { 6800300000 56 50 ffd7 8945fc 85c0 }
            // n = 6, score = 200
            //   6800300000           | push                0x3000
            //   56                   | push                esi
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 237568
}