rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.gameover_dga."
        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.gameover_dga"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { ff15???????? b301 68???????? ff15???????? 5f 5e }
            // n = 6, score = 700
            //   ff15????????         |                     
            //   b301                 | mov                 bl, 1
            //   68????????           |                     
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_1 = { 8bcf 50 53 ff742428 e8???????? 8bf0 89742418 }
            // n = 7, score = 700
            //   8bcf                 | mov                 ecx, edi
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff742428             | push                dword ptr [esp + 0x28]
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   89742418             | mov                 dword ptr [esp + 0x18], esi

        $sequence_2 = { a1???????? 51 83c074 8bce 68???????? 50 e8???????? }
            // n = 7, score = 700
            //   a1????????           |                     
            //   51                   | push                ecx
            //   83c074               | add                 eax, 0x74
            //   8bce                 | mov                 ecx, esi
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_3 = { c20400 81ec28010000 53 55 8bac2434010000 56 57 }
            // n = 7, score = 700
            //   c20400               | ret                 4
            //   81ec28010000         | sub                 esp, 0x128
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   8bac2434010000       | mov                 ebp, dword ptr [esp + 0x134]
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_4 = { 8bc2 c1e808 23c7 8984248c000000 8bc2 c1e80a }
            // n = 6, score = 700
            //   8bc2                 | mov                 eax, edx
            //   c1e808               | shr                 eax, 8
            //   23c7                 | and                 eax, edi
            //   8984248c000000       | mov                 dword ptr [esp + 0x8c], eax
            //   8bc2                 | mov                 eax, edx
            //   c1e80a               | shr                 eax, 0xa

        $sequence_5 = { 5d c3 56 8b35???????? 85f6 7415 8b4e04 }
            // n = 7, score = 700
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8b35????????         |                     
            //   85f6                 | test                esi, esi
            //   7415                 | je                  0x17
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]

        $sequence_6 = { eb21 83f803 7518 6a07 8d942428010000 59 e8???????? }
            // n = 7, score = 700
            //   eb21                 | jmp                 0x23
            //   83f803               | cmp                 eax, 3
            //   7518                 | jne                 0x1a
            //   6a07                 | push                7
            //   8d942428010000       | lea                 edx, [esp + 0x128]
            //   59                   | pop                 ecx
            //   e8????????           |                     

        $sequence_7 = { 58 5f 5e 5d 5b 81c444010000 c21800 }
            // n = 7, score = 700
            //   58                   | pop                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   81c444010000         | add                 esp, 0x144
            //   c21800               | ret                 0x18

        $sequence_8 = { 85f6 7433 8b442410 53 56 ff7510 8bc8 }
            // n = 7, score = 700
            //   85f6                 | test                esi, esi
            //   7433                 | je                  0x35
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8bc8                 | mov                 ecx, eax

        $sequence_9 = { 8bc8 e8???????? 83be8800000002 0f85a6000000 8d4e60 897de0 8b01 }
            // n = 7, score = 700
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   83be8800000002       | cmp                 dword ptr [esi + 0x88], 2
            //   0f85a6000000         | jne                 0xac
            //   8d4e60               | lea                 ecx, [esi + 0x60]
            //   897de0               | mov                 dword ptr [ebp - 0x20], edi
            //   8b01                 | mov                 eax, dword ptr [ecx]

    condition:
        7 of them and filesize < 540672
}