rule win_virtualgate_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.virtualgate."
        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.virtualgate"
        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 = { 85c0 742a 488bc5 4c8d053d890100 488bcd 48c1f906 }
            // n = 6, score = 100
            //   85c0                 | je                  0xd4
            //   742a                 | movzx               ecx, byte ptr [ebx]
            //   488bc5               | inc                 edx
            //   4c8d053d890100       | movsx               eax, byte ptr [ecx + 0x21920]
            //   488bcd               | test                eax, eax
            //   48c1f906             | movzx               eax, byte ptr [esi]

        $sequence_1 = { b901000000 4c8d05253d0100 488d15263d0100 e8???????? }
            // n = 4, score = 100
            //   b901000000           | dec                 ecx
            //   4c8d05253d0100       | mov                 edx, ecx
            //   488d15263d0100       | dec                 esp
            //   e8????????           |                     

        $sequence_2 = { 83b97004000002 0f8493010000 488d2d28270100 897350 89732c e9???????? 48ff4318 }
            // n = 7, score = 100
            //   83b97004000002       | cmp                 byte ptr [esp + 0x68], ch
            //   0f8493010000         | dec                 eax
            //   488d2d28270100       | mov                 ecx, dword ptr [ebp + 0x7f]
            //   897350               | dec                 eax
            //   89732c               | cmp                 ecx, -1
            //   e9????????           |                     
            //   48ff4318             | je                  0xafb

        $sequence_3 = { 4d03dd 418a0430 41ffc1 4b8b8cd7f0250200 4903c8 }
            // n = 5, score = 100
            //   4d03dd               | cmp                 byte ptr [ebp - 1], ch
            //   418a0430             | je                  0x77
            //   41ffc1               | dec                 eax
            //   4b8b8cd7f0250200     | mov                 ecx, dword ptr [ebp - 0x19]
            //   4903c8               | dec                 esp

        $sequence_4 = { 0f8456010000 33f6 0f1f8000000000 4c8d442434 c744243410000000 488d542448 }
            // n = 6, score = 100
            //   0f8456010000         | mov                 cl, bl
            //   33f6                 | dec                 eax
            //   0f1f8000000000       | lea                 ecx, [0x1b90a]
            //   4c8d442434           | nop                 
            //   c744243410000000     | dec                 eax
            //   488d542448           | mov                 eax, dword ptr [ebx]

        $sequence_5 = { 418bd2 4d8b8cc7f0250200 498bfa 4b8d04f1 443854383e }
            // n = 5, score = 100
            //   418bd2               | je                  0x11c9
            //   4d8b8cc7f0250200     | dec                 eax
            //   498bfa               | mov                 eax, dword ptr [esp + 0x50]
            //   4b8d04f1             | and                 dword ptr [eax + 0x3a8], 0xfffffffd
            //   443854383e           | inc                 ecx

        $sequence_6 = { 4b8b8cd7f0250200 4903c8 49ffc0 428844d93e 4963c1 483bc2 }
            // n = 6, score = 100
            //   4b8b8cd7f0250200     | cmp                 eax, ecx
            //   4903c8               | cmove               eax, ecx
            //   49ffc0               | mov                 ecx, dword ptr [eax]
            //   428844d93e           | dec                 eax
            //   4963c1               | mov                 edx, eax
            //   483bc2               | dec                 eax

        $sequence_7 = { c6415401 d1e8 eb14 488d157c1b0100 b806000000 48895148 c6415400 }
            // n = 7, score = 100
            //   c6415401             | dec                 ebp
            //   d1e8                 | mov                 eax, ebp
            //   eb14                 | dec                 ecx
            //   488d157c1b0100       | mov                 edx, esi
            //   b806000000           | dec                 eax
            //   48895148             | mov                 ecx, edi
            //   c6415400             | test                eax, eax

        $sequence_8 = { 4c896d97 44886d9f e8???????? 488b442458 bbe9fd0000 39580c 7518 }
            // n = 7, score = 100
            //   4c896d97             | je                  0xb8b
            //   44886d9f             | dec                 eax
            //   e8????????           |                     
            //   488b442458           | mov                 eax, dword ptr [esp + 0x50]
            //   bbe9fd0000           | and                 dword ptr [eax + 0x3a8], 0xfffffffd
            //   39580c               | inc                 esp
            //   7518                 | mov                 eax, ebx

        $sequence_9 = { e8???????? 8b08 e8???????? 488bd0 488d0d74d50100 e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8b08                 | lea                 edx, [0xfffef913]
            //   e8????????           |                     
            //   488bd0               | inc                 esp
            //   488d0d74d50100       | mov                 dword ptr [esp + 0x30], esp
            //   e8????????           |                     

    condition:
        7 of them and filesize < 323584
}