rule win_neddnloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 3c75 3c85 3c92 3c9c 3cb2 3cbe 3cd1 }
            // n = 7, score = 200
            //   3c75                 | cmp                 al, 0x75
            //   3c85                 | cmp                 al, 0x85
            //   3c92                 | cmp                 al, 0x92
            //   3c9c                 | cmp                 al, 0x9c
            //   3cb2                 | cmp                 al, 0xb2
            //   3cbe                 | cmp                 al, 0xbe
            //   3cd1                 | cmp                 al, 0xd1

        $sequence_1 = { 397dfc 7652 33c0 50 50 8945f0 }
            // n = 6, score = 200
            //   397dfc               | cmp                 dword ptr [ebp - 4], edi
            //   7652                 | jbe                 0x54
            //   33c0                 | xor                 eax, eax
            //   50                   | push                eax
            //   50                   | push                eax
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

        $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 = { 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 = { 894508 e8???????? 83c40c 037d08 2975f0 ff4d08 }
            // n = 6, score = 200
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   037d08               | add                 edi, dword ptr [ebp + 8]
            //   2975f0               | sub                 dword ptr [ebp - 0x10], esi
            //   ff4d08               | dec                 dword ptr [ebp + 8]

        $sequence_5 = { 53 ff750c 03c7 8906 51 8bfe 895034 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   03c7                 | add                 eax, edi
            //   8906                 | mov                 dword ptr [esi], eax
            //   51                   | push                ecx
            //   8bfe                 | mov                 edi, esi
            //   895034               | mov                 dword ptr [eax + 0x34], edx

        $sequence_6 = { 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_7 = { 89442414 33c0 53 33db 56 }
            // n = 5, score = 200
            //   89442414             | mov                 dword ptr [esp + 0x14], eax
            //   33c0                 | xor                 eax, eax
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   56                   | push                esi

        $sequence_8 = { 8b1d???????? 56 ffd3 3985f0fbffff }
            // n = 4, score = 200
            //   8b1d????????         |                     
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   3985f0fbffff         | cmp                 dword ptr [ebp - 0x410], eax

        $sequence_9 = { 891c81 8d7301 8b06 69c0b179379e c1e814 }
            // n = 5, score = 200
            //   891c81               | mov                 dword ptr [ecx + eax*4], ebx
            //   8d7301               | lea                 esi, [ebx + 1]
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   69c0b179379e         | imul                eax, eax, 0x9e3779b1
            //   c1e814               | shr                 eax, 0x14

    condition:
        7 of them and filesize < 237568
}