rule win_rctrl_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rctrl."
        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.rctrl"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8bec 8b4508 57 8d3c85d0235d00 8b0f 85c9 740b }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8d3c85d0235d00       | lea                 edi, [eax*4 + 0x5d23d0]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   85c9                 | test                ecx, ecx
            //   740b                 | je                  0xd

        $sequence_1 = { 6804100000 6a00 50 e8???????? 83c40c c784242810000027000000 89742434 }
            // n = 7, score = 100
            //   6804100000           | push                0x1004
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c784242810000027000000     | mov    dword ptr [esp + 0x1028], 0x27
            //   89742434             | mov                 dword ptr [esp + 0x34], esi

        $sequence_2 = { c745c07cb85700 c745c864000000 8bb064010000 8bce e8???????? }
            // n = 5, score = 100
            //   c745c07cb85700       | mov                 dword ptr [ebp - 0x40], 0x57b87c
            //   c745c864000000       | mov                 dword ptr [ebp - 0x38], 0x64
            //   8bb064010000         | mov                 esi, dword ptr [eax + 0x164]
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_3 = { 50 e8???????? 83c40c c784242810000027000000 8d442428 6800100000 6a00 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c784242810000027000000     | mov    dword ptr [esp + 0x1028], 0x27
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   6800100000           | push                0x1000
            //   6a00                 | push                0

        $sequence_4 = { ff7004 ff75d0 e8???????? ff75b8 ff15???????? 8d4de4 c745e470535700 }
            // n = 7, score = 100
            //   ff7004               | push                dword ptr [eax + 4]
            //   ff75d0               | push                dword ptr [ebp - 0x30]
            //   e8????????           |                     
            //   ff75b8               | push                dword ptr [ebp - 0x48]
            //   ff15????????         |                     
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   c745e470535700       | mov                 dword ptr [ebp - 0x1c], 0x575370

        $sequence_5 = { e8???????? a1???????? 33c4 89842414100000 56 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   89842414100000       | mov                 dword ptr [esp + 0x1014], eax
            //   56                   | push                esi

        $sequence_6 = { 8bf0 6a00 56 e8???????? 8dbde0edffff 83c410 }
            // n = 6, score = 100
            //   8bf0                 | mov                 esi, eax
            //   6a00                 | push                0
            //   56                   | push                esi
            //   e8????????           |                     
            //   8dbde0edffff         | lea                 edi, [ebp - 0x1220]
            //   83c410               | add                 esp, 0x10

        $sequence_7 = { 33c4 89842490180000 53 8b5d0c 56 8b7508 57 }
            // n = 7, score = 100
            //   33c4                 | xor                 eax, esp
            //   89842490180000       | mov                 dword ptr [esp + 0x1890], eax
            //   53                   | push                ebx
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi

        $sequence_8 = { c3 6a40 b8???????? e8???????? 8bf1 8b86b4000000 }
            // n = 6, score = 100
            //   c3                   | ret                 
            //   6a40                 | push                0x40
            //   b8????????           |                     
            //   e8????????           |                     
            //   8bf1                 | mov                 esi, ecx
            //   8b86b4000000         | mov                 eax, dword ptr [esi + 0xb4]

        $sequence_9 = { c20400 56 ff15???????? 56 8bd8 ff15???????? ff15???????? }
            // n = 7, score = 100
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi
            //   8bd8                 | mov                 ebx, eax
            //   ff15????????         |                     
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 4315136
}