rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 53 8b5c2410 55 8b6c240c 03dd 57 53 }
            // n = 7, score = 700
            //   53                   | push                ebx
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]
            //   55                   | push                ebp
            //   8b6c240c             | mov                 ebp, dword ptr [esp + 0xc]
            //   03dd                 | add                 ebx, ebp
            //   57                   | push                edi
            //   53                   | push                ebx

        $sequence_1 = { 895c2414 8bce e8???????? 837c241400 0f8581000000 33c9 }
            // n = 6, score = 700
            //   895c2414             | mov                 dword ptr [esp + 0x14], ebx
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   837c241400           | cmp                 dword ptr [esp + 0x14], 0
            //   0f8581000000         | jne                 0x87
            //   33c9                 | xor                 ecx, ecx

        $sequence_2 = { 53 894618 e8???????? 84c0 7440 6a00 }
            // n = 6, score = 700
            //   53                   | push                ebx
            //   894618               | mov                 dword ptr [esi + 0x18], eax
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7440                 | je                  0x42
            //   6a00                 | push                0

        $sequence_3 = { 03c0 01471c 8b4718 8bcd 53 8b1cb0 8bd3 }
            // n = 7, score = 700
            //   03c0                 | add                 eax, eax
            //   01471c               | add                 dword ptr [edi + 0x1c], eax
            //   8b4718               | mov                 eax, dword ptr [edi + 0x18]
            //   8bcd                 | mov                 ecx, ebp
            //   53                   | push                ebx
            //   8b1cb0               | mov                 ebx, dword ptr [eax + esi*4]
            //   8bd3                 | mov                 edx, ebx

        $sequence_4 = { c3 f605????????01 7534 56 be???????? 56 ff15???????? }
            // n = 7, score = 700
            //   c3                   | ret                 
            //   f605????????01       |                     
            //   7534                 | jne                 0x36
            //   56                   | push                esi
            //   be????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_5 = { 83c604 3bd7 72f2 81c138020000 53 8b01 ff5010 }
            // n = 7, score = 700
            //   83c604               | add                 esi, 4
            //   3bd7                 | cmp                 edx, edi
            //   72f2                 | jb                  0xfffffff4
            //   81c138020000         | add                 ecx, 0x238
            //   53                   | push                ebx
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5010               | call                dword ptr [eax + 0x10]

        $sequence_6 = { 0fb74114 0fb6d0 c1e808 83e001 89542414 89442440 }
            // n = 6, score = 700
            //   0fb74114             | movzx               eax, word ptr [ecx + 0x14]
            //   0fb6d0               | movzx               edx, al
            //   c1e808               | shr                 eax, 8
            //   83e001               | and                 eax, 1
            //   89542414             | mov                 dword ptr [esp + 0x14], edx
            //   89442440             | mov                 dword ptr [esp + 0x40], eax

        $sequence_7 = { ff760c ff7608 6a10 e8???????? 84c0 0f847a010000 8364241c00 }
            // n = 7, score = 700
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   ff7608               | push                dword ptr [esi + 8]
            //   6a10                 | push                0x10
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f847a010000         | je                  0x180
            //   8364241c00           | and                 dword ptr [esp + 0x1c], 0

        $sequence_8 = { e8???????? 885e10 895e08 895e0c 5e 5b }
            // n = 6, score = 700
            //   e8????????           |                     
            //   885e10               | mov                 byte ptr [esi + 0x10], bl
            //   895e08               | mov                 dword ptr [esi + 8], ebx
            //   895e0c               | mov                 dword ptr [esi + 0xc], ebx
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_9 = { f7730c 41 4d 75e9 5f 5d 8bc6 }
            // n = 7, score = 700
            //   f7730c               | div                 dword ptr [ebx + 0xc]
            //   41                   | inc                 ecx
            //   4d                   | dec                 ebp
            //   75e9                 | jne                 0xffffffeb
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp
            //   8bc6                 | mov                 eax, esi

    condition:
        7 of them and filesize < 540672
}