rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 7505 83c8ff eb27 837c240c00 7417 6b460860 6a60 }
            // n = 7, score = 700
            //   7505                 | jne                 7
            //   83c8ff               | or                  eax, 0xffffffff
            //   eb27                 | jmp                 0x29
            //   837c240c00           | cmp                 dword ptr [esp + 0xc], 0
            //   7417                 | je                  0x19
            //   6b460860             | imul                eax, dword ptr [esi + 8], 0x60
            //   6a60                 | push                0x60

        $sequence_1 = { 8bc2 2bc1 89442474 8bc3 2bc1 0fb64d05 89442478 }
            // n = 7, score = 700
            //   8bc2                 | mov                 eax, edx
            //   2bc1                 | sub                 eax, ecx
            //   89442474             | mov                 dword ptr [esp + 0x74], eax
            //   8bc3                 | mov                 eax, ebx
            //   2bc1                 | sub                 eax, ecx
            //   0fb64d05             | movzx               ecx, byte ptr [ebp + 5]
            //   89442478             | mov                 dword ptr [esp + 0x78], eax

        $sequence_2 = { 50 6a07 6800000080 ff7508 ff15???????? 89442410 }
            // n = 6, score = 700
            //   50                   | push                eax
            //   6a07                 | push                7
            //   6800000080           | push                0x80000000
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   89442410             | mov                 dword ptr [esp + 0x10], eax

        $sequence_3 = { 8bdf 397e10 7625 8b460c 8d4c2418 03c3 89442424 }
            // n = 7, score = 700
            //   8bdf                 | mov                 ebx, edi
            //   397e10               | cmp                 dword ptr [esi + 0x10], edi
            //   7625                 | jbe                 0x27
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   03c3                 | add                 eax, ebx
            //   89442424             | mov                 dword ptr [esp + 0x24], eax

        $sequence_4 = { 84c0 0f8488000000 8b35???????? 57 8b3d???????? }
            // n = 5, score = 700
            //   84c0                 | test                al, al
            //   0f8488000000         | je                  0x8e
            //   8b35????????         |                     
            //   57                   | push                edi
            //   8b3d????????         |                     

        $sequence_5 = { 7422 6a00 6a01 ba???????? 33c9 }
            // n = 5, score = 700
            //   7422                 | je                  0x24
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   ba????????           |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_6 = { ffb4245c010000 52 8b542448 e8???????? 85c0 0f8534010000 8b6c2438 }
            // n = 7, score = 700
            //   ffb4245c010000       | push                dword ptr [esp + 0x15c]
            //   52                   | push                edx
            //   8b542448             | mov                 edx, dword ptr [esp + 0x48]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8534010000         | jne                 0x13a
            //   8b6c2438             | mov                 ebp, dword ptr [esp + 0x38]

        $sequence_7 = { 6a08 50 56 c645f400 }
            // n = 4, score = 700
            //   6a08                 | push                8
            //   50                   | push                eax
            //   56                   | push                esi
            //   c645f400             | mov                 byte ptr [ebp - 0xc], 0

        $sequence_8 = { 740a 48 0f8527100000 800e80 8b542414 8a4e17 }
            // n = 6, score = 700
            //   740a                 | je                  0xc
            //   48                   | dec                 eax
            //   0f8527100000         | jne                 0x102d
            //   800e80               | or                  byte ptr [esi], 0x80
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   8a4e17               | mov                 cl, byte ptr [esi + 0x17]

        $sequence_9 = { 8b4c2410 eb05 6a05 58 8bc8 69f860ea0000 69c160ea0000 }
            // n = 7, score = 700
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   eb05                 | jmp                 7
            //   6a05                 | push                5
            //   58                   | pop                 eax
            //   8bc8                 | mov                 ecx, eax
            //   69f860ea0000         | imul                edi, eax, 0xea60
            //   69c160ea0000         | imul                eax, ecx, 0xea60

    condition:
        7 of them and filesize < 540672
}