rule win_ncctrojan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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???????? }
            // n = 6, score = 500
            //   68????????           |                     
            //   e9????????           |                     
            //   83f801               | cmp                 eax, 1
            //   750a                 | jne                 0xc
            //   68????????           |                     
            //   e9????????           |                     

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

        $sequence_2 = { 0f280d???????? 8bfe 2bf9 8d4a10 0f1f840000000000 }
            // n = 5, score = 400
            //   0f280d????????       |                     
            //   8bfe                 | mov                 edi, esi
            //   2bf9                 | sub                 edi, ecx
            //   8d4a10               | lea                 ecx, [edx + 0x10]
            //   0f1f840000000000     | nop                 dword ptr [eax + eax]

        $sequence_3 = { e8???????? 8bf0 8bfa eb10 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8bfa                 | mov                 edi, edx
            //   eb10                 | jmp                 0x12

        $sequence_4 = { e8???????? 83c40c 66c745f40000 8d45ec 0f57c0 }
            // n = 5, score = 400
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   66c745f40000         | mov                 word ptr [ebp - 0xc], 0
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   0f57c0               | xorps               xmm0, xmm0

        $sequence_5 = { 8b0d???????? e9???????? 833d????????01 0f8581010000 ff35???????? 8d44242c 68???????? }
            // n = 7, score = 400
            //   8b0d????????         |                     
            //   e9????????           |                     
            //   833d????????01       |                     
            //   0f8581010000         | jne                 0x187
            //   ff35????????         |                     
            //   8d44242c             | lea                 eax, [esp + 0x2c]
            //   68????????           |                     

        $sequence_6 = { e8???????? 68???????? 8d85f0bfffff 6800400000 50 e8???????? 68???????? }
            // n = 7, score = 400
            //   e8????????           |                     
            //   68????????           |                     
            //   8d85f0bfffff         | lea                 eax, [ebp - 0x4010]
            //   6800400000           | push                0x4000
            //   50                   | push                eax
            //   e8????????           |                     
            //   68????????           |                     

        $sequence_7 = { 8d8424bc080000 6a00 50 e8???????? 83c41c }
            // n = 5, score = 400
            //   8d8424bc080000       | lea                 eax, [esp + 0x8bc]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_8 = { 50 e8???????? 8b85ccfeffff 6a10 }
            // n = 4, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b85ccfeffff         | mov                 eax, dword ptr [ebp - 0x134]
            //   6a10                 | push                0x10

        $sequence_9 = { 8b450c 3dffffff7f 7605 e9???????? }
            // n = 4, score = 300
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   3dffffff7f           | cmp                 eax, 0x7fffffff
            //   7605                 | jbe                 7
            //   e9????????           |                     

        $sequence_10 = { 0f84b8000000 6a14 59 8bf3 }
            // n = 4, score = 300
            //   0f84b8000000         | je                  0xbe
            //   6a14                 | push                0x14
            //   59                   | pop                 ecx
            //   8bf3                 | mov                 esi, ebx

        $sequence_11 = { 50 ff75c8 8d4708 ff75c4 }
            // n = 4, score = 300
            //   50                   | push                eax
            //   ff75c8               | push                dword ptr [ebp - 0x38]
            //   8d4708               | lea                 eax, [edi + 8]
            //   ff75c4               | push                dword ptr [ebp - 0x3c]

        $sequence_12 = { 50 53 e8???????? 59 59 5b c7461407000000 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   5b                   | pop                 ebx
            //   c7461407000000       | mov                 dword ptr [esi + 0x14], 7

        $sequence_13 = { 0f8433110000 83ec08 0fae5c2404 8b442404 25807f0000 }
            // n = 5, score = 300
            //   0f8433110000         | je                  0x1139
            //   83ec08               | sub                 esp, 8
            //   0fae5c2404           | stmxcsr             dword ptr [esp + 4]
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   25807f0000           | and                 eax, 0x7f80

        $sequence_14 = { 85f6 0f99c0 8d044501000000 5e 5d c3 3b0d???????? }
            // n = 7, score = 300
            //   85f6                 | test                esi, esi
            //   0f99c0               | setns               al
            //   8d044501000000       | lea                 eax, [eax*2 + 1]
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   3b0d????????         |                     

        $sequence_15 = { 7404 c60330 43 ffb57cffffff }
            // n = 4, score = 300
            //   7404                 | je                  6
            //   c60330               | mov                 byte ptr [ebx], 0x30
            //   43                   | inc                 ebx
            //   ffb57cffffff         | push                dword ptr [ebp - 0x84]

    condition:
        7 of them and filesize < 1160192
}