rule win_nightdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.nightdoor."
        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.nightdoor"
        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 = { 8d95bcfbffff 52 ff15???????? 8945d0 837dd0ff 0f8476020000 }
            // n = 6, score = 100
            //   8d95bcfbffff         | lea                 edx, [ebp - 0x444]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   837dd0ff             | cmp                 dword ptr [ebp - 0x30], -1
            //   0f8476020000         | je                  0x27c

        $sequence_1 = { 83c408 8b45fc b301 38582c 0f8504010000 8b4a04 }
            // n = 6, score = 100
            //   83c408               | add                 esp, 8
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   b301                 | mov                 bl, 1
            //   38582c               | cmp                 byte ptr [eax + 0x2c], bl
            //   0f8504010000         | jne                 0x10a
            //   8b4a04               | mov                 ecx, dword ptr [edx + 4]

        $sequence_2 = { 8986b0000000 e8???????? 8d9e88000000 8bce 8986d8000000 e8???????? 8d9e88000000 }
            // n = 7, score = 100
            //   8986b0000000         | mov                 dword ptr [esi + 0xb0], eax
            //   e8????????           |                     
            //   8d9e88000000         | lea                 ebx, [esi + 0x88]
            //   8bce                 | mov                 ecx, esi
            //   8986d8000000         | mov                 dword ptr [esi + 0xd8], eax
            //   e8????????           |                     
            //   8d9e88000000         | lea                 ebx, [esi + 0x88]

        $sequence_3 = { 68e9fd0000 ff15???????? 8b55cc 0355d0 c60200 8b45cc 50 }
            // n = 7, score = 100
            //   68e9fd0000           | push                0xfde9
            //   ff15????????         |                     
            //   8b55cc               | mov                 edx, dword ptr [ebp - 0x34]
            //   0355d0               | add                 edx, dword ptr [ebp - 0x30]
            //   c60200               | mov                 byte ptr [edx], 0
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   50                   | push                eax

        $sequence_4 = { 33d1 89502c 0fb6482f 0fb689b0e20710 0fb6582e 0fb69bb0e20710 c1e108 }
            // n = 7, score = 100
            //   33d1                 | xor                 edx, ecx
            //   89502c               | mov                 dword ptr [eax + 0x2c], edx
            //   0fb6482f             | movzx               ecx, byte ptr [eax + 0x2f]
            //   0fb689b0e20710       | movzx               ecx, byte ptr [ecx + 0x1007e2b0]
            //   0fb6582e             | movzx               ebx, byte ptr [eax + 0x2e]
            //   0fb69bb0e20710       | movzx               ebx, byte ptr [ebx + 0x1007e2b0]
            //   c1e108               | shl                 ecx, 8

        $sequence_5 = { 8d45c0 e8???????? e9???????? 8b8d58feffff 8bf7 8bbd68feffff 8bd7 }
            // n = 7, score = 100
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b8d58feffff         | mov                 ecx, dword ptr [ebp - 0x1a8]
            //   8bf7                 | mov                 esi, edi
            //   8bbd68feffff         | mov                 edi, dword ptr [ebp - 0x198]
            //   8bd7                 | mov                 edx, edi

        $sequence_6 = { 8d8d84f7ffff e8???????? c645fc02 8d8dccf4ffff e8???????? 8d8d34f5ffff 51 }
            // n = 7, score = 100
            //   8d8d84f7ffff         | lea                 ecx, [ebp - 0x87c]
            //   e8????????           |                     
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   8d8dccf4ffff         | lea                 ecx, [ebp - 0xb34]
            //   e8????????           |                     
            //   8d8d34f5ffff         | lea                 ecx, [ebp - 0xacc]
            //   51                   | push                ecx

        $sequence_7 = { 897768 894f78 895f6c 53 893a e8???????? 83c418 }
            // n = 7, score = 100
            //   897768               | mov                 dword ptr [edi + 0x68], esi
            //   894f78               | mov                 dword ptr [edi + 0x78], ecx
            //   895f6c               | mov                 dword ptr [edi + 0x6c], ebx
            //   53                   | push                ebx
            //   893a                 | mov                 dword ptr [edx], edi
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_8 = { 8945fc 8b55f8 8b45fc 894208 8b4df8 8b5104 52 }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   894208               | mov                 dword ptr [edx + 8], eax
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8b5104               | mov                 edx, dword ptr [ecx + 4]
            //   52                   | push                edx

        $sequence_9 = { 57 8b7d08 8bcf 8bf0 e8???????? 6a00 57 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8bcf                 | mov                 ecx, edi
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   6a00                 | push                0
            //   57                   | push                edi

    condition:
        7 of them and filesize < 1124352
}