rule win_virdetdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { eb05 7e0b 8d7eff 3bfb 7dd2 33c0 eb07 }
            // n = 7, score = 100
            //   eb05                 | jmp                 7
            //   7e0b                 | jle                 0xd
            //   8d7eff               | lea                 edi, [esi - 1]
            //   3bfb                 | cmp                 edi, ebx
            //   7dd2                 | jge                 0xffffffd4
            //   33c0                 | xor                 eax, eax
            //   eb07                 | jmp                 9

        $sequence_1 = { 8be5 5d c3 8bc7 ebf5 53 56 }
            // n = 7, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8bc7                 | mov                 eax, edi
            //   ebf5                 | jmp                 0xfffffff7
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_2 = { ff15???????? 8945f0 85c0 0f84a6000000 8b35???????? 8d480c }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   85c0                 | test                eax, eax
            //   0f84a6000000         | je                  0xac
            //   8b35????????         |                     
            //   8d480c               | lea                 ecx, [eax + 0xc]

        $sequence_3 = { 8365fc00 8db334020000 56 ffd7 8bbb30020000 }
            // n = 5, score = 100
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8db334020000         | lea                 esi, [ebx + 0x234]
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   8bbb30020000         | mov                 edi, dword ptr [ebx + 0x230]

        $sequence_4 = { e8???????? 8bf0 85f6 7422 6a18 6a00 56 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7422                 | je                  0x24
            //   6a18                 | push                0x18
            //   6a00                 | push                0
            //   56                   | push                esi

        $sequence_5 = { 8d45e0 8975e0 50 e8???????? 8b55e0 59 8b4de4 }
            // n = 7, score = 100
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   59                   | pop                 ecx
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]

        $sequence_6 = { 8d442424 50 8d442410 8bd7 }
            // n = 4, score = 100
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   8bd7                 | mov                 edx, edi

        $sequence_7 = { eb43 33db 897df8 83fe28 7237 0fb74f04 83c6d8 }
            // n = 7, score = 100
            //   eb43                 | jmp                 0x45
            //   33db                 | xor                 ebx, ebx
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   83fe28               | cmp                 esi, 0x28
            //   7237                 | jb                  0x39
            //   0fb74f04             | movzx               ecx, word ptr [edi + 4]
            //   83c6d8               | add                 esi, -0x28

        $sequence_8 = { 8b55e0 59 8b4de4 eb51 33f6 8bfb }
            // n = 6, score = 100
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   59                   | pop                 ecx
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   eb51                 | jmp                 0x53
            //   33f6                 | xor                 esi, esi
            //   8bfb                 | mov                 edi, ebx

        $sequence_9 = { 8bcb e8???????? ff07 8b0f 8b55f8 }
            // n = 5, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   ff07                 | inc                 dword ptr [edi]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]

    condition:
        7 of them and filesize < 106496
}