rule win_newcore_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.newcore_rat."
        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.newcore_rat"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 6a00 52 c744242801000000 89442430 c744243402000000 ff15???????? 837c242400 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   52                   | push                edx
            //   c744242801000000     | mov                 dword ptr [esp + 0x28], 1
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   c744243402000000     | mov                 dword ptr [esp + 0x34], 2
            //   ff15????????         |                     
            //   837c242400           | cmp                 dword ptr [esp + 0x24], 0

        $sequence_1 = { 8b9360300000 682000cc00 6a00 6a00 56 52 }
            // n = 6, score = 100
            //   8b9360300000         | mov                 edx, dword ptr [ebx + 0x3060]
            //   682000cc00           | push                0xcc0020
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi
            //   52                   | push                edx

        $sequence_2 = { c70000000000 33c0 68fe010000 50 8d4c240e }
            // n = 5, score = 100
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   33c0                 | xor                 eax, eax
            //   68fe010000           | push                0x1fe
            //   50                   | push                eax
            //   8d4c240e             | lea                 ecx, [esp + 0xe]

        $sequence_3 = { 42 899698160000 81e1ff000000 33d2 8a9184fe0210 66ff849690040000 663d0001 }
            // n = 7, score = 100
            //   42                   | inc                 edx
            //   899698160000         | mov                 dword ptr [esi + 0x1698], edx
            //   81e1ff000000         | and                 ecx, 0xff
            //   33d2                 | xor                 edx, edx
            //   8a9184fe0210         | mov                 dl, byte ptr [ecx + 0x1002fe84]
            //   66ff849690040000     | inc                 word ptr [esi + edx*4 + 0x490]
            //   663d0001             | cmp                 ax, 0x100

        $sequence_4 = { 51 6a32 53 e8???????? 668b542430 83c410 837b3c00 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   6a32                 | push                0x32
            //   53                   | push                ebx
            //   e8????????           |                     
            //   668b542430           | mov                 dx, word ptr [esp + 0x30]
            //   83c410               | add                 esp, 0x10
            //   837b3c00             | cmp                 dword ptr [ebx + 0x3c], 0

        $sequence_5 = { 83c40c 50 ff15???????? 50 8d4c2434 51 ff15???????? }
            // n = 7, score = 100
            //   83c40c               | add                 esp, 0xc
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_6 = { ff15???????? 8b8c2438040000 f7d8 5f 1bc0 5e }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8b8c2438040000       | mov                 ecx, dword ptr [esp + 0x438]
            //   f7d8                 | neg                 eax
            //   5f                   | pop                 edi
            //   1bc0                 | sbb                 eax, eax
            //   5e                   | pop                 esi

        $sequence_7 = { ebc9 8bc8 c1f905 8d1c8dc0cd0310 8bf8 83e71f }
            // n = 6, score = 100
            //   ebc9                 | jmp                 0xffffffcb
            //   8bc8                 | mov                 ecx, eax
            //   c1f905               | sar                 ecx, 5
            //   8d1c8dc0cd0310       | lea                 ebx, [ecx*4 + 0x1003cdc0]
            //   8bf8                 | mov                 edi, eax
            //   83e71f               | and                 edi, 0x1f

        $sequence_8 = { 85c0 0f8473ffffff 837c240c00 0f8468ffffff 53 6a01 8d942478140000 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f8473ffffff         | je                  0xffffff79
            //   837c240c00           | cmp                 dword ptr [esp + 0xc], 0
            //   0f8468ffffff         | je                  0xffffff6e
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   8d942478140000       | lea                 edx, [esp + 0x1478]

        $sequence_9 = { 56 8b35???????? 57 50 8d44242c }
            // n = 5, score = 100
            //   56                   | push                esi
            //   8b35????????         |                     
            //   57                   | push                edi
            //   50                   | push                eax
            //   8d44242c             | lea                 eax, [esp + 0x2c]

    condition:
        7 of them and filesize < 581632
}