rule win_ncctrojan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ncctrojan."
        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.ncctrojan"
        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 = { e9???????? 83f801 750a 68???????? e9???????? }
            // n = 5, score = 500
            //   e9????????           |                     
            //   83f801               | cmp                 eax, 1
            //   750a                 | jne                 0xc
            //   68????????           |                     
            //   e9????????           |                     

        $sequence_1 = { 7536 8b85e8feffff 85c0 750a }
            // n = 4, score = 500
            //   7536                 | jne                 0x38
            //   8b85e8feffff         | mov                 eax, dword ptr [ebp - 0x118]
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc

        $sequence_2 = { ff15???????? 8945f0 8d45ec 6a10 }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   6a10                 | push                0x10

        $sequence_3 = { 6a00 50 e8???????? 83c420 56 6a00 }
            // n = 6, score = 400
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20
            //   56                   | push                esi
            //   6a00                 | push                0

        $sequence_4 = { 6800400000 50 e8???????? 83c40c 837c240c00 }
            // n = 5, score = 400
            //   6800400000           | push                0x4000
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   837c240c00           | cmp                 dword ptr [esp + 0xc], 0

        $sequence_5 = { eb0c 68???????? eb05 68???????? 8d44247c 6800400000 50 }
            // n = 7, score = 400
            //   eb0c                 | jmp                 0xe
            //   68????????           |                     
            //   eb05                 | jmp                 7
            //   68????????           |                     
            //   8d44247c             | lea                 eax, [esp + 0x7c]
            //   6800400000           | push                0x4000
            //   50                   | push                eax

        $sequence_6 = { 745c 8b3d???????? 8d75ac 8b15???????? }
            // n = 4, score = 400
            //   745c                 | je                  0x5e
            //   8b3d????????         |                     
            //   8d75ac               | lea                 esi, [ebp - 0x54]
            //   8b15????????         |                     

        $sequence_7 = { 6a00 ff15???????? 8d85e8fdffff 50 8d85e8adffff 6800400000 }
            // n = 6, score = 400
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8d85e8fdffff         | lea                 eax, [ebp - 0x218]
            //   50                   | push                eax
            //   8d85e8adffff         | lea                 eax, [ebp - 0x5218]
            //   6800400000           | push                0x4000

        $sequence_8 = { 0f8552ffffff eb57 6800400000 8d85d496ffff 6a00 50 }
            // n = 6, score = 400
            //   0f8552ffffff         | jne                 0xffffff58
            //   eb57                 | jmp                 0x59
            //   6800400000           | push                0x4000
            //   8d85d496ffff         | lea                 eax, [ebp - 0x692c]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_9 = { 50 e8???????? 8b4d08 e8???????? e9???????? 8b4d08 e8???????? }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_10 = { 6a00 50 e8???????? 0fb745b8 50 0fb745b6 }
            // n = 6, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   0fb745b8             | movzx               eax, word ptr [ebp - 0x48]
            //   50                   | push                eax
            //   0fb745b6             | movzx               eax, word ptr [ebp - 0x4a]

        $sequence_11 = { 8b542408 8d420c 8b8a2cf8ffff 33c8 e8???????? 8b4afc }
            // n = 6, score = 300
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b8a2cf8ffff         | mov                 ecx, dword ptr [edx - 0x7d4]
            //   33c8                 | xor                 ecx, eax
            //   e8????????           |                     
            //   8b4afc               | mov                 ecx, dword ptr [edx - 4]

        $sequence_12 = { 8b542408 8d420c 8b8a0cfefeff 33c8 }
            // n = 4, score = 300
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b8a0cfefeff         | mov                 ecx, dword ptr [edx - 0x101f4]
            //   33c8                 | xor                 ecx, eax

        $sequence_13 = { 85d2 7e10 8ac1 02c9 2480 }
            // n = 5, score = 300
            //   85d2                 | test                edx, edx
            //   7e10                 | jle                 0x12
            //   8ac1                 | mov                 al, cl
            //   02c9                 | add                 cl, cl
            //   2480                 | and                 al, 0x80

        $sequence_14 = { 85db 0f84b8000000 6a14 59 }
            // n = 4, score = 300
            //   85db                 | test                ebx, ebx
            //   0f84b8000000         | je                  0xbe
            //   6a14                 | push                0x14
            //   59                   | pop                 ecx

        $sequence_15 = { 0fb745ac 50 8d45bc 68???????? }
            // n = 4, score = 300
            //   0fb745ac             | movzx               eax, word ptr [ebp - 0x54]
            //   50                   | push                eax
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   68????????           |                     

        $sequence_16 = { 6a00 50 e8???????? 56 8d856cfeffff 68???????? }
            // n = 6, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d856cfeffff         | lea                 eax, [ebp - 0x194]
            //   68????????           |                     

    condition:
        7 of them and filesize < 1160192
}