rule win_nabucur_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nabucur."
        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.nabucur"
        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 = { 49 23cf 894c241c 3bc3 }
            // n = 4, score = 200
            //   49                   | dec                 ecx
            //   23cf                 | and                 ecx, edi
            //   894c241c             | mov                 dword ptr [esp + 0x1c], ecx
            //   3bc3                 | cmp                 eax, ebx

        $sequence_1 = { 49 3b442430 891e 8944241c }
            // n = 4, score = 200
            //   49                   | dec                 ecx
            //   3b442430             | cmp                 eax, dword ptr [esp + 0x30]
            //   891e                 | mov                 dword ptr [esi], ebx
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax

        $sequence_2 = { 33ff 3bc7 7425 8b520c 8d0cc500000000 2bc8 }
            // n = 6, score = 200
            //   33ff                 | xor                 edi, edi
            //   3bc7                 | cmp                 eax, edi
            //   7425                 | je                  0x27
            //   8b520c               | mov                 edx, dword ptr [edx + 0xc]
            //   8d0cc500000000       | lea                 ecx, [eax*8]
            //   2bc8                 | sub                 ecx, eax

        $sequence_3 = { 009eaa030000 0fb686aa030000 57 83f80a 0f876d010000 }
            // n = 5, score = 200
            //   009eaa030000         | add                 byte ptr [esi + 0x3aa], bl
            //   0fb686aa030000       | movzx               eax, byte ptr [esi + 0x3aa]
            //   57                   | push                edi
            //   83f80a               | cmp                 eax, 0xa
            //   0f876d010000         | ja                  0x173

        $sequence_4 = { 49 23cb 894d08 5f 5e 5d 5b }
            // n = 7, score = 200
            //   49                   | dec                 ecx
            //   23cb                 | and                 ecx, ebx
            //   894d08               | mov                 dword ptr [ebp + 8], ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx

        $sequence_5 = { 49 23ce 894f18 8bf0 85c0 0f8521040000 }
            // n = 6, score = 200
            //   49                   | dec                 ecx
            //   23ce                 | and                 ecx, esi
            //   894f18               | mov                 dword ptr [edi + 0x18], ecx
            //   8bf0                 | mov                 esi, eax
            //   85c0                 | test                eax, eax
            //   0f8521040000         | jne                 0x427

        $sequence_6 = { 49 40 85c9 75f4 }
            // n = 4, score = 200
            //   49                   | dec                 ecx
            //   40                   | inc                 eax
            //   85c9                 | test                ecx, ecx
            //   75f4                 | jne                 0xfffffff6

        $sequence_7 = { 49 40 0bf2 85c9 }
            // n = 4, score = 200
            //   49                   | dec                 ecx
            //   40                   | inc                 eax
            //   0bf2                 | or                  esi, edx
            //   85c9                 | test                ecx, ecx

        $sequence_8 = { bb95c9c7fe e8???????? 81f2cf3a3100 81f3db2737fd }
            // n = 4, score = 100
            //   bb95c9c7fe           | mov                 ebx, 0xfec7c995
            //   e8????????           |                     
            //   81f2cf3a3100         | xor                 edx, 0x313acf
            //   81f3db2737fd         | xor                 ebx, 0xfd3727db

        $sequence_9 = { a1???????? a6 48 207b98 }
            // n = 4, score = 100
            //   a1????????           |                     
            //   a6                   | cmpsb               byte ptr [esi], byte ptr es:[edi]
            //   48                   | dec                 eax
            //   207b98               | and                 byte ptr [ebx - 0x68], bh

        $sequence_10 = { e9???????? 837d0c00 750c ffb5a4fdffff 8f05???????? }
            // n = 5, score = 100
            //   e9????????           |                     
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   750c                 | jne                 0xe
            //   ffb5a4fdffff         | push                dword ptr [ebp - 0x25c]
            //   8f05????????         |                     

        $sequence_11 = { baaf746bf8 81f2d2b424fb e8???????? 81f2e5b3d7f7 bbee904bf8 }
            // n = 5, score = 100
            //   baaf746bf8           | mov                 edx, 0xf86b74af
            //   81f2d2b424fb         | xor                 edx, 0xfb24b4d2
            //   e8????????           |                     
            //   81f2e5b3d7f7         | xor                 edx, 0xf7d7b3e5
            //   bbee904bf8           | mov                 ebx, 0xf84b90ee

        $sequence_12 = { 8706 85c0 75f5 61 c3 60 }
            // n = 6, score = 100
            //   8706                 | xchg                dword ptr [esi], eax
            //   85c0                 | test                eax, eax
            //   75f5                 | jne                 0xfffffff7
            //   61                   | popal               
            //   c3                   | ret                 
            //   60                   | pushal              

        $sequence_13 = { bbb76d15f9 e8???????? bb1ddfc5f7 81f2560b5efd ba3be69bfc }
            // n = 5, score = 100
            //   bbb76d15f9           | mov                 ebx, 0xf9156db7
            //   e8????????           |                     
            //   bb1ddfc5f7           | mov                 ebx, 0xf7c5df1d
            //   81f2560b5efd         | xor                 edx, 0xfd5e0b56
            //   ba3be69bfc           | mov                 edx, 0xfc9be63b

        $sequence_14 = { bafa2649fd 83f901 7db6 ba8fb4a3fb ebb8 83e904 }
            // n = 6, score = 100
            //   bafa2649fd           | mov                 edx, 0xfd4926fa
            //   83f901               | cmp                 ecx, 1
            //   7db6                 | jge                 0xffffffb8
            //   ba8fb4a3fb           | mov                 edx, 0xfba3b48f
            //   ebb8                 | jmp                 0xffffffba
            //   83e904               | sub                 ecx, 4

        $sequence_15 = { 2d4c67d056 0e 67389db266 d07d0b 80ab140ee42859 }
            // n = 5, score = 100
            //   2d4c67d056           | sub                 eax, 0x56d0674c
            //   0e                   | push                cs
            //   67389db266           | cmp                 byte ptr [di + 0x66b2], bl
            //   d07d0b               | sar                 byte ptr [ebp + 0xb], 1
            //   80ab140ee42859       | sub                 byte ptr [ebx + 0x28e40e14], 0x59

    condition:
        7 of them and filesize < 1949696
}