rule win_nighthawk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nighthawk."
        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.nighthawk"
        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 = { 83780803 0f85a9070000 4889742460 48897c2478 48897c2470 448bc7 488d1538600500 }
            // n = 7, score = 100
            //   83780803             | mov                 ecx, dword ptr [ecx + 0x100]
            //   0f85a9070000         | push                edi
            //   4889742460           | dec                 eax
            //   48897c2478           | sub                 esp, 0x20
            //   48897c2470           | dec                 eax
            //   448bc7               | mov                 edi, ecx
            //   488d1538600500       | xor                 ebx, ebx

        $sequence_1 = { bf02000000 488365b800 488365c800 488365d000 41b820000000 488bd3 488d4db8 }
            // n = 7, score = 100
            //   bf02000000           | dec                 ebp
            //   488365b800           | test                esi, esi
            //   488365c800           | jne                 0xfffffe64
            //   488365d000           | mov                 ecx, dword ptr [esi + 0xe0]
            //   41b820000000         | jne                 0x325
            //   488bd3               | cmp                 word ptr [eax + 8], 0xb
            //   488d4db8             | jne                 0x325

        $sequence_2 = { e8???????? 90 488b4d6f ff15???????? bf04000000 8bc7 4c8d9c2490000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   90                   | inc                 ebp
            //   488b4d6f             | test                edi, edi
            //   ff15????????         |                     
            //   bf04000000           | je                  0x50d
            //   8bc7                 | mov                 eax, dword ptr [eax + ecx*4 + 0xb38d8]
            //   4c8d9c2490000000     | test                eax, eax

        $sequence_3 = { 85c0 0f8495000000 4c8b5750 4c03d0 410fb652ff 413a12 0f8580000000 }
            // n = 7, score = 100
            //   85c0                 | mov                 ecx, esi
            //   0f8495000000         | mov                 edi, eax
            //   4c8b5750             | jb                  0x5c
            //   4c03d0               | dec                 eax
            //   410fb652ff           | mov                 ecx, dword ptr [esi]
            //   413a12               | dec                 ecx
            //   0f8580000000         | mov                 eax, dword ptr [esi]

        $sequence_4 = { 7405 e8???????? 48899fc0000000 48c787c800000007000000 66899fb0000000 488d0525fc0900 488907 }
            // n = 7, score = 100
            //   7405                 | dec                 esp
            //   e8????????           |                     
            //   48899fc0000000       | mov                 dword ptr [ebp - 0x68], edi
            //   48c787c800000007000000     | inc    ecx
            //   66899fb0000000       | mov                 eax, 0x12
            //   488d0525fc0900       | dec                 eax
            //   488907               | lea                 edx, [0x72ea5]

        $sequence_5 = { 48c7c6fcffffff eb19 488d340a 493bf6 731d 498bf6 48c1e602 }
            // n = 7, score = 100
            //   48c7c6fcffffff       | mov                 edi, eax
            //   eb19                 | dec                 eax
            //   488d340a             | lea                 edx, [ebx + 0x20]
            //   493bf6               | dec                 eax
            //   731d                 | lea                 ecx, [ebp + 0x17]
            //   498bf6               | dec                 eax
            //   48c1e602             | lea                 ecx, [ebx + 0x40]

        $sequence_6 = { 7406 e8???????? 90 498bd7 488d4d30 e8???????? e8???????? }
            // n = 7, score = 100
            //   7406                 | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 dword ptr [ebp + 0x148], edi
            //   498bd7               | inc                 esp
            //   488d4d30             | mov                 byte ptr [ebp + 0x130], ch
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_7 = { ff15???????? 8bd8 488b442470 498906 4c8d9c2430010000 8bc3 498b5b28 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8bd8                 | dec                 eax
            //   488b442470           | mov                 dword ptr [esp + 8], ebx
            //   498906               | dec                 ecx
            //   4c8d9c2430010000     | mov                 eax, eax
            //   8bc3                 | dec                 ebp
            //   498b5b28             | mov                 ebx, eax

        $sequence_8 = { 7421 4183e4fb 4489a5f0000000 48837da010 720f 488b4d88 4885c9 }
            // n = 7, score = 100
            //   7421                 | dec                 ecx
            //   4183e4fb             | sub                 ecx, esi
            //   4489a5f0000000       | dec                 eax
            //   48837da010           | sar                 ecx, 3
            //   720f                 | dec                 ecx
            //   488b4d88             | imul                ecx, ebp
            //   4885c9               | dec                 ecx

        $sequence_9 = { 4c8d4d50 41b804000000 48895c2420 488d5558 ff15???????? 85c0 74b8 }
            // n = 7, score = 100
            //   4c8d4d50             | dec                 ecx
            //   41b804000000         | mov                 ecx, dword ptr [eax]
            //   48895c2420           | dec                 ecx
            //   488d5558             | and                 dword ptr [eax], 0
            //   ff15????????         |                     
            //   85c0                 | dec                 ecx
            //   74b8                 | mov                 eax, dword ptr [eax - 8]

    condition:
        7 of them and filesize < 1949696
}