rule win_ncctrojan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 68???????? e9???????? 83f801 750a 68???????? e9???????? 83f802 }
            // n = 7, score = 500
            //   68????????           |                     
            //   e9????????           |                     
            //   83f801               | cmp                 eax, 1
            //   750a                 | jne                 0xc
            //   68????????           |                     
            //   e9????????           |                     
            //   83f802               | cmp                 eax, 2

        $sequence_1 = { 83f805 7536 8b85e8feffff 85c0 750a 68???????? e9???????? }
            // n = 7, score = 500
            //   83f805               | cmp                 eax, 5
            //   7536                 | jne                 0x38
            //   8b85e8feffff         | mov                 eax, dword ptr [ebp - 0x118]
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   68????????           |                     
            //   e9????????           |                     

        $sequence_2 = { 50 e8???????? 83c40c 8d842418050000 50 8d84247c460000 }
            // n = 6, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d842418050000       | lea                 eax, [esp + 0x518]
            //   50                   | push                eax
            //   8d84247c460000       | lea                 eax, [esp + 0x467c]

        $sequence_3 = { 6800400000 85c0 8d85ecbdffff 6a00 }
            // n = 4, score = 400
            //   6800400000           | push                0x4000
            //   85c0                 | test                eax, eax
            //   8d85ecbdffff         | lea                 eax, [ebp - 0x4214]
            //   6a00                 | push                0

        $sequence_4 = { 50 e8???????? 83c410 8d4606 }
            // n = 4, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d4606               | lea                 eax, [esi + 6]

        $sequence_5 = { 8d85f4bfffff 6800400000 50 e8???????? 8d45f4 }
            // n = 5, score = 400
            //   8d85f4bfffff         | lea                 eax, [ebp - 0x400c]
            //   6800400000           | push                0x4000
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]

        $sequence_6 = { 84c0 75f9 eb47 e8???????? 68???????? }
            // n = 5, score = 400
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   eb47                 | jmp                 0x49
            //   e8????????           |                     
            //   68????????           |                     

        $sequence_7 = { 75f5 2bca d1f9 8d4101 50 e8???????? 8b542410 }
            // n = 7, score = 400
            //   75f5                 | jne                 0xfffffff7
            //   2bca                 | sub                 ecx, edx
            //   d1f9                 | sar                 ecx, 1
            //   8d4101               | lea                 eax, [ecx + 1]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]

        $sequence_8 = { 8b8d70fffeff e9???????? 8d8d80fffeff e9???????? }
            // n = 4, score = 300
            //   8b8d70fffeff         | mov                 ecx, dword ptr [ebp - 0x10090]
            //   e9????????           |                     
            //   8d8d80fffeff         | lea                 ecx, [ebp - 0x10080]
            //   e9????????           |                     

        $sequence_9 = { 837d1c10 8d4508 0f434508 50 ff15???????? }
            // n = 5, score = 300
            //   837d1c10             | cmp                 dword ptr [ebp + 0x1c], 0x10
            //   8d4508               | lea                 eax, [ebp + 8]
            //   0f434508             | cmovae              eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_10 = { 8b9580fffeff 8d5218 e8???????? 8d8578fffeff }
            // n = 4, score = 300
            //   8b9580fffeff         | mov                 edx, dword ptr [ebp - 0x10080]
            //   8d5218               | lea                 edx, [edx + 0x18]
            //   e8????????           |                     
            //   8d8578fffeff         | lea                 eax, [ebp - 0x10088]

        $sequence_11 = { 50 ff15???????? 8b4518 8d4d08 }
            // n = 4, score = 300
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]
            //   8d4d08               | lea                 ecx, [ebp + 8]

        $sequence_12 = { 0f84b8000000 6a14 59 8bf3 8d7dac f3a5 }
            // n = 6, score = 300
            //   0f84b8000000         | je                  0xbe
            //   6a14                 | push                0x14
            //   59                   | pop                 ecx
            //   8bf3                 | mov                 esi, ebx
            //   8d7dac               | lea                 edi, [ebp - 0x54]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]

        $sequence_13 = { 8b8a2cf8ffff 33c8 e8???????? 8b4afc 33c8 e8???????? b8???????? }
            // n = 7, score = 300
            //   8b8a2cf8ffff         | mov                 ecx, dword ptr [edx - 0x7d4]
            //   33c8                 | xor                 ecx, eax
            //   e8????????           |                     
            //   8b4afc               | mov                 ecx, dword ptr [edx - 4]
            //   33c8                 | xor                 ecx, eax
            //   e8????????           |                     
            //   b8????????           |                     

        $sequence_14 = { 837d1c10 8b7518 0f437d08 ff15???????? }
            // n = 4, score = 300
            //   837d1c10             | cmp                 dword ptr [ebp + 0x1c], 0x10
            //   8b7518               | mov                 esi, dword ptr [ebp + 0x18]
            //   0f437d08             | cmovae              edi, dword ptr [ebp + 8]
            //   ff15????????         |                     

        $sequence_15 = { 50 51 8d4d08 e8???????? 56 }
            // n = 5, score = 300
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     
            //   56                   | push                esi

    condition:
        7 of them and filesize < 1160192
}