rule win_nightledger_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nightledger."
        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.nightledger"
        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 = { e9???????? 488d0dbf871000 e8???????? 833d????????ff 0f85b4fbffff 0f57c0 0f1105???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488d0dbf871000       | inc                 ecx
            //   e8????????           |                     
            //   833d????????ff       |                     
            //   0f85b4fbffff         | inc                 esi
            //   0f57c0               | mov                 dword ptr [esp], 0xfa8e0da5
            //   0f1105????????       |                     

        $sequence_1 = { b937bbc175 8b542404 81fa6ac2232b 740a 81fa37bbc175 75ec eb26 }
            // n = 7, score = 100
            //   b937bbc175           | mov                 eax, 0x1d88f1ef
            //   8b542404             | mov                 ecx, 0xe1e29b48
            //   81fa6ac2232b         | cmovne              eax, ecx
            //   740a                 | mov                 dword ptr [esp + 0x28], eax
            //   81fa37bbc175         | mov                 dword ptr [esp + 0x54], 0
            //   75ec                 | cmp                 eax, 0xd70eac7a
            //   eb26                 | mov                 eax, 0x6f0

        $sequence_2 = { ff0d???????? 488b4db0 8b05???????? a801 75e2 4885c9 7419 }
            // n = 7, score = 100
            //   ff0d????????         |                     
            //   488b4db0             | pop                 esi
            //   8b05????????         |                     
            //   a801                 | jp                  0x22c
            //   75e2                 | rol                 edi, 1
            //   4885c9               | inc                 esp
            //   7419                 | and                 al, 8

        $sequence_3 = { 896c2404 4c8b742418 48895c2440 4c89742438 e9???????? 488b5c2410 c60300 }
            // n = 7, score = 100
            //   896c2404             | mov                 dword ptr [esp + 0x40], eax
            //   4c8b742418           | cmp                 eax, 0x6e2627e0
            //   48895c2440           | jle                 0x16d5
            //   4c89742438           | cmp                 eax, 0x7e4000b0
            //   e9????????           |                     
            //   488b5c2410           | je                  0x16f6
            //   c60300               | cmp                 eax, 0x6e2627e1

        $sequence_4 = { e9???????? 4181fede860ba5 0f8542fcffff 4883c460 5b 5d 5f }
            // n = 7, score = 100
            //   e9????????           |                     
            //   4181fede860ba5       | inc                 esp
            //   0f8542fcffff         | mov                 ecx, dword ptr [esp + 0x14]
            //   4883c460             | inc                 ecx
            //   5b                   | inc                 ecx
            //   5d                   | inc                 ecx
            //   5f                   | cmp                 ecx, 0xe1e18b5b

        $sequence_5 = { e9???????? ff0d???????? c74424409dd7948d e9???????? 3d7b20bc69 0f856df5ffff 4889f0 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   ff0d????????         |                     
            //   c74424409dd7948d     | inc                 ecx
            //   e9????????           |                     
            //   3d7b20bc69           | cmp                 ecx, 0x85b119a6
            //   0f856df5ffff         | jne                 0x217
            //   4889f0               | dec                 eax

        $sequence_6 = { ff05???????? 488b3d???????? 8b05???????? a801 7404 ffd7 ebf2 }
            // n = 7, score = 100
            //   ff05????????         |                     
            //   488b3d????????       |                     
            //   8b05????????         |                     
            //   a801                 | test                bl, 1
            //   7404                 | je                  0x125
            //   ffd7                 | inc                 ecx
            //   ebf2                 | movzx               ecx, byte ptr [eax]

        $sequence_7 = { e9???????? c685b204000001 e8???????? 488d0db3360c00 e8???????? 833d????????ff 0f85e9e9ffff }
            // n = 7, score = 100
            //   e9????????           |                     
            //   c685b204000001       | inc                 bl
            //   e8????????           |                     
            //   488d0db3360c00       | test                bl, 1
            //   e8????????           |                     
            //   833d????????ff       |                     
            //   0f85e9e9ffff         | mov                 ebx, 0x1648603b

        $sequence_8 = { e9???????? 3d5fa2f037 0f8574feffff 8b742438 488b8c24d8130000 4831e1 e8???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   3d5fa2f037           | cmp                 eax, 0xc8a1b660
            //   0f8574feffff         | jne                 0xe41
            //   8b742438             | mov                 eax, dword ptr [esp + 0x28]
            //   488b8c24d8130000     | mov                 dword ptr [esp + 0x54], eax
            //   4831e1               | cmp                 eax, 0x84c80e1d
            //   e8????????           |                     

        $sequence_9 = { eb80 3d8b968b91 0f841f010000 3da194bb97 0f8450010000 3d5c6d0abd 0f855fffffff }
            // n = 7, score = 100
            //   eb80                 | mov                 eax, 0x1e84a751
            //   3d8b968b91           | mov                 ecx, 0xe861ab34
            //   0f841f010000         | jmp                 0x35e
            //   3da194bb97           | cmp                 eax, 0xfc95ebe5
            //   0f8450010000         | jne                 0x1ae
            //   3d5c6d0abd           | dec                 eax
            //   0f855fffffff         | mov                 ecx, dword ptr [esp + 0x38]

    condition:
        7 of them and filesize < 2284544
}