rule win_virdetdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.virdetdoor."
        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.virdetdoor"
        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 = { e8???????? 83c40c 8945f8 85c0 745f 8b0b 6bc118 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   85c0                 | test                eax, eax
            //   745f                 | je                  0x61
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   6bc118               | imul                eax, ecx, 0x18

        $sequence_1 = { 0f8cc1feffff eb13 68???????? e8???????? 59 59 c7430401000000 }
            // n = 7, score = 100
            //   0f8cc1feffff         | jl                  0xfffffec7
            //   eb13                 | jmp                 0x15
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   c7430401000000       | mov                 dword ptr [ebx + 4], 1

        $sequence_2 = { 51 8bcb e8???????? 50 57 6a44 5a }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   50                   | push                eax
            //   57                   | push                edi
            //   6a44                 | push                0x44
            //   5a                   | pop                 edx

        $sequence_3 = { 7438 8b742410 8d542438 8b4c2414 83c608 56 6a3a }
            // n = 7, score = 100
            //   7438                 | je                  0x3a
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   8d542438             | lea                 edx, [esp + 0x38]
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   83c608               | add                 esi, 8
            //   56                   | push                esi
            //   6a3a                 | push                0x3a

        $sequence_4 = { c60109 e9???????? c6010b e9???????? }
            // n = 4, score = 100
            //   c60109               | mov                 byte ptr [ecx], 9
            //   e9????????           |                     
            //   c6010b               | mov                 byte ptr [ecx], 0xb
            //   e9????????           |                     

        $sequence_5 = { c6410100 0fb64210 83f83a 0f87ce010000 ff24859e414000 c60102 e9???????? }
            // n = 7, score = 100
            //   c6410100             | mov                 byte ptr [ecx + 1], 0
            //   0fb64210             | movzx               eax, byte ptr [edx + 0x10]
            //   83f83a               | cmp                 eax, 0x3a
            //   0f87ce010000         | ja                  0x1d4
            //   ff24859e414000       | jmp                 dword ptr [eax*4 + 0x40419e]
            //   c60102               | mov                 byte ptr [ecx], 2
            //   e9????????           |                     

        $sequence_6 = { 7517 6a3f eb12 6a40 eb0e 6a41 eb0a }
            // n = 7, score = 100
            //   7517                 | jne                 0x19
            //   6a3f                 | push                0x3f
            //   eb12                 | jmp                 0x14
            //   6a40                 | push                0x40
            //   eb0e                 | jmp                 0x10
            //   6a41                 | push                0x41
            //   eb0a                 | jmp                 0xc

        $sequence_7 = { 8bda 6a10 8d4708 50 53 ff15???????? }
            // n = 6, score = 100
            //   8bda                 | mov                 ebx, edx
            //   6a10                 | push                0x10
            //   8d4708               | lea                 eax, [edi + 8]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     

        $sequence_8 = { 8b45fc 890b e9???????? 833c3a47 756c 6a00 }
            // n = 6, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   890b                 | mov                 dword ptr [ebx], ecx
            //   e9????????           |                     
            //   833c3a47             | cmp                 dword ptr [edx + edi], 0x47
            //   756c                 | jne                 0x6e
            //   6a00                 | push                0

        $sequence_9 = { e8???????? 59 59 c7460401000000 8d8e80020000 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   c7460401000000       | mov                 dword ptr [esi + 4], 1
            //   8d8e80020000         | lea                 ecx, [esi + 0x280]

    condition:
        7 of them and filesize < 106496
}