rule win_gamotrol_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.gamotrol."
        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.gamotrol"
        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 = { ff15???????? 55 90 90 8bec 83c40b }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   55                   | push                ebp
            //   90                   | nop                 
            //   90                   | nop                 
            //   8bec                 | mov                 ebp, esp
            //   83c40b               | add                 esp, 0xb

        $sequence_1 = { 83ec51 85f6 90 90 }
            // n = 4, score = 100
            //   83ec51               | sub                 esp, 0x51
            //   85f6                 | test                esi, esi
            //   90                   | nop                 
            //   90                   | nop                 

        $sequence_2 = { 57 8b39 742e 39510c }
            // n = 4, score = 100
            //   57                   | push                edi
            //   8b39                 | mov                 edi, dword ptr [ecx]
            //   742e                 | je                  0x30
            //   39510c               | cmp                 dword ptr [ecx + 0xc], edx

        $sequence_3 = { 833cb8ff 8d04b8 7409 8b08 }
            // n = 4, score = 100
            //   833cb8ff             | cmp                 dword ptr [eax + edi*4], -1
            //   8d04b8               | lea                 eax, [eax + edi*4]
            //   7409                 | je                  0xb
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_4 = { 397e0c 7e23 8d9b00000000 8b4608 833cb8ff }
            // n = 5, score = 100
            //   397e0c               | cmp                 dword ptr [esi + 0xc], edi
            //   7e23                 | jle                 0x25
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   833cb8ff             | cmp                 dword ptr [eax + edi*4], -1

        $sequence_5 = { ff75e0 e8???????? 8b4de0 8945ec }
            // n = 4, score = 100
            //   ff75e0               | push                dword ptr [ebp - 0x20]
            //   e8????????           |                     
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax

        $sequence_6 = { 81ec00020000 8d6c24fc a1???????? 33c5 898500020000 6a0c b8???????? }
            // n = 7, score = 100
            //   81ec00020000         | sub                 esp, 0x200
            //   8d6c24fc             | lea                 ebp, [esp - 4]
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   898500020000         | mov                 dword ptr [ebp + 0x200], eax
            //   6a0c                 | push                0xc
            //   b8????????           |                     

        $sequence_7 = { 40 5e c3 e9???????? 6aff }
            // n = 5, score = 100
            //   40                   | inc                 eax
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   e9????????           |                     
            //   6aff                 | push                -1

        $sequence_8 = { 56 57 90 55 }
            // n = 4, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   90                   | nop                 
            //   55                   | push                ebp

        $sequence_9 = { 83c40f 83c4f1 83c45b 83ec5b 90 90 8be5 }
            // n = 7, score = 100
            //   83c40f               | add                 esp, 0xf
            //   83c4f1               | add                 esp, -0xf
            //   83c45b               | add                 esp, 0x5b
            //   83ec5b               | sub                 esp, 0x5b
            //   90                   | nop                 
            //   90                   | nop                 
            //   8be5                 | mov                 esp, ebp

    condition:
        7 of them and filesize < 376832
}