rule win_downdelph_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.downdelph."
        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.downdelph"
        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 = { e8???????? 8b95e0fbffff 8bc3 e8???????? }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8b95e0fbffff         | mov                 edx, dword ptr [ebp - 0x420]
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     

        $sequence_1 = { 33c9 ba08000000 e8???????? b834000000 e8???????? }
            // n = 5, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   ba08000000           | mov                 edx, 8
            //   e8????????           |                     
            //   b834000000           | mov                 eax, 0x34
            //   e8????????           |                     

        $sequence_2 = { e8???????? 83c404 8b4500 e8???????? 8b5500 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b4500               | mov                 eax, dword ptr [ebp]
            //   e8????????           |                     
            //   8b5500               | mov                 edx, dword ptr [ebp]

        $sequence_3 = { 8d55d8 e8???????? 8b5708 88041a }
            // n = 4, score = 100
            //   8d55d8               | lea                 edx, dword ptr [ebp - 0x28]
            //   e8????????           |                     
            //   8b5708               | mov                 edx, dword ptr [edi + 8]
            //   88041a               | mov                 byte ptr [edx + ebx], al

        $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, dword ptr [ebp - 8]
            //   ba????????           |                     
            //   e8????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_5 = { 8b55f4 e8???????? bb01000000 eb1a 8b06 }
            // n = 5, score = 100
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   bb01000000           | mov                 ebx, 1
            //   eb1a                 | jmp                 0x1c
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_6 = { 50 8bcf 83e908 a1???????? 8b04b0 ba08000000 e8???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   83e908               | sub                 ecx, 8
            //   a1????????           |                     
            //   8b04b0               | mov                 eax, dword ptr [eax + esi*4]
            //   ba08000000           | mov                 edx, 8
            //   e8????????           |                     

        $sequence_7 = { a1???????? 8b04b0 ba08000000 e8???????? 8b45f0 50 68???????? }
            // n = 7, score = 100
            //   a1????????           |                     
            //   8b04b0               | mov                 eax, dword ptr [eax + esi*4]
            //   ba08000000           | mov                 edx, 8
            //   e8????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_8 = { 7c1a 40 8945f8 8b03 8d04b8 8b13 }
            // n = 6, score = 100
            //   7c1a                 | jl                  0x1c
            //   40                   | inc                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   8d04b8               | lea                 eax, dword ptr [eax + edi*4]
            //   8b13                 | mov                 edx, dword ptr [ebx]

        $sequence_9 = { e8???????? eb01 47 8b45f4 e8???????? 3bf8 7ed8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb01                 | jmp                 3
            //   47                   | inc                 edi
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   3bf8                 | cmp                 edi, eax
            //   7ed8                 | jle                 0xffffffda

    condition:
        7 of them and filesize < 172032
}