rule win_downdelph_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.downdelph"
        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 = { e8???????? 50 b8???????? b901000000 8b15???????? e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   50                   | push                eax
            //   b8????????           |                     
            //   b901000000           | mov                 ecx, 1
            //   8b15????????         |                     
            //   e8????????           |                     

        $sequence_1 = { e8???????? 8b55ec 33c9 e8???????? 8d45f8 33c9 33d2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   33c9                 | xor                 ecx, ecx
            //   e8????????           |                     
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   33c9                 | xor                 ecx, ecx
            //   33d2                 | xor                 edx, edx

        $sequence_2 = { 0f8491000000 b301 8d45d8 8b55fc 8b14ba }
            // n = 5, score = 100
            //   0f8491000000         | je                  0x97
            //   b301                 | mov                 bl, 1
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b14ba               | mov                 edx, dword ptr [edx + edi*4]

        $sequence_3 = { 50 85c0 0f8483000000 31c0 31db bfcccccc0c }
            // n = 6, score = 100
            //   50                   | push                eax
            //   85c0                 | test                eax, eax
            //   0f8483000000         | je                  0x89
            //   31c0                 | xor                 eax, eax
            //   31db                 | xor                 ebx, ebx
            //   bfcccccc0c           | mov                 edi, 0xccccccc

        $sequence_4 = { 33c0 8906 8d45f8 ba???????? e8???????? 6a00 6a00 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   8906                 | mov                 dword ptr [esi], eax
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   ba????????           |                     
            //   e8????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_5 = { 8d45d8 e8???????? 8b55d8 8d45f4 e8???????? }
            // n = 5, score = 100
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   e8????????           |                     
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   e8????????           |                     

        $sequence_6 = { 8b4de0 8bd0 8b45e4 e8???????? }
            // n = 4, score = 100
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8bd0                 | mov                 edx, eax
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   e8????????           |                     

        $sequence_7 = { 8bf0 8bc6 e8???????? 8b06 85c0 7405 }
            // n = 6, score = 100
            //   8bf0                 | mov                 esi, eax
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7

        $sequence_8 = { 8bd3 8bc7 e8???????? 8d442404 50 6a00 6a00 }
            // n = 7, score = 100
            //   8bd3                 | mov                 edx, ebx
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   8d442404             | lea                 eax, [esp + 4]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_9 = { 8b45cc 8d55ec e8???????? 8bd8 33c0 }
            // n = 5, score = 100
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 172032
}