rule win_portstarter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.portstarter."
        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.portstarter"
        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 = { e8???????? 488b7c2448 4c8b442430 c644247000 48c744247800000000 440f11bc2480000000 31c0 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   488b7c2448           | cmp                 ecx, eax
            //   4c8b442430           | dec                 eax
            //   c644247000           | mov                 edi, dword ptr [esp + 0x50]
            //   48c744247800000000     | dec    eax
            //   440f11bc2480000000     | mov    dword ptr [edi + 0x10], ecx
            //   31c0                 | nop                 

        $sequence_1 = { e8???????? 488b542460 4c8ba42498000000 418b44d408 488b8c24e8000000 4839c1 0f863d030000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   488b542460           | mov                 ecx, dword ptr [esp + edx*8 + 8]
            //   4c8ba42498000000     | dec                 eax
            //   418b44d408           | mov                 edx, dword ptr [esp + 0xc0]
            //   488b8c24e8000000     | dec                 eax
            //   4839c1               | mov                 ecx, dword ptr [esp + 0xa0]
            //   0f863d030000         | dec                 eax

        $sequence_2 = { e8???????? 488b542460 4c8ba42498000000 418b4cd408 488b9424c0000000 488b9c24c8000000 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   488b542460           | dec                 eax
            //   4c8ba42498000000     | mov                 edx, dword ptr [esp + 0x60]
            //   418b4cd408           | dec                 esp
            //   488b9424c0000000     | mov                 esp, dword ptr [esp + 0x98]
            //   488b9c24c8000000     | inc                 ecx

        $sequence_3 = { e8???????? 4889d8 4889f1 e8???????? 4c89c8 }
            // n = 5, score = 300
            //   e8????????           |                     
            //   4889d8               | mov                 ecx, dword ptr [esp + edx*8 + 8]
            //   4889f1               | dec                 eax
            //   e8????????           |                     
            //   4c89c8               | mov                 edx, dword ptr [esp + 0xc0]

        $sequence_4 = { e8???????? 488b8c24a0000000 48894808 833d????????00 750d 488b942400010000 488910 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   488b8c24a0000000     | mov                 eax, ecx
            //   48894808             | dec                 eax
            //   833d????????00       |                     
            //   750d                 | mov                 edx, dword ptr [esp + 0x18]
            //   488b942400010000     | dec                 eax
            //   488910               | mov                 edi, dword ptr [esp + 0x30]

        $sequence_5 = { e8???????? 4889f7 488b4f08 833d????????00 }
            // n = 4, score = 300
            //   e8????????           |                     
            //   4889f7               | inc                 ecx
            //   488b4f08             | mov                 eax, dword ptr [esp + edx*8 + 8]
            //   833d????????00       |                     

        $sequence_6 = { e8???????? 488b542418 488b7c2430 48895758 }
            // n = 4, score = 300
            //   e8????????           |                     
            //   488b542418           | dec                 eax
            //   488b7c2430           | mov                 ebx, dword ptr [esp + 0xc8]
            //   48895758             | dec                 eax

        $sequence_7 = { e8???????? 488b7c2450 48894f10 833d????????00 6690 7505 488907 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   488b7c2450           | mov                 dword ptr [eax], edx
            //   48894f10             | dec                 eax
            //   833d????????00       |                     
            //   6690                 | mov                 ecx, dword ptr [esp + 0xa0]
            //   7505                 | dec                 eax
            //   488907               | mov                 dword ptr [eax + 8], ecx

        $sequence_8 = { 4863442430 486bc010 488d0de3061c00 4803c8 }
            // n = 4, score = 100
            //   4863442430           | dec                 eax
            //   486bc010             | mov                 ecx, dword ptr [edi + 8]
            //   488d0de3061c00       | dec                 eax
            //   4803c8               | mov                 edi, esi

        $sequence_9 = { 41b800de1b00 488d15d02f0000 488d4c2420 e8???????? }
            // n = 4, score = 100
            //   41b800de1b00         | dec                 eax
            //   488d15d02f0000       | mov                 dword ptr [edi + 0x60], 0x2000
            //   488d4c2420           | jne                 0x14
            //   e8????????           |                     

        $sequence_10 = { 488d0de3061c00 4803c8 488bc1 48634c2434 }
            // n = 4, score = 100
            //   488d0de3061c00       | dec                 eax
            //   4803c8               | lea                 ecx, [esp + 0x20]
            //   488bc1               | inc                 ecx
            //   48634c2434           | mov                 eax, 0x1bde00

        $sequence_11 = { 4883ec48 8b442458 89442424 48c744242800000000 41b800de1b00 }
            // n = 5, score = 100
            //   4883ec48             | mov                 dword ptr [ecx], ebx
            //   8b442458             | dec                 eax
            //   89442424             | mov                 edi, esi
            //   48c744242800000000     | dec    eax
            //   41b800de1b00         | mov                 ecx, dword ptr [edi + 8]

    condition:
        7 of them and filesize < 14221312
}