rule win_newcore_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { 8bc6 e8???????? eb0c c7035a1b0000 }
            // n = 4, score = 100
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   eb0c                 | jmp                 0xe
            //   c7035a1b0000         | mov                 dword ptr [ebx], 0x1b5a

        $sequence_1 = { 6a04 8d4c2418 51 52 895c2424 ffd7 }
            // n = 6, score = 100
            //   6a04                 | push                4
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   895c2424             | mov                 dword ptr [esp + 0x24], ebx
            //   ffd7                 | call                edi

        $sequence_2 = { 014c242c b81f85eb51 f7eb c1fa04 8bca c1e91f }
            // n = 6, score = 100
            //   014c242c             | add                 dword ptr [esp + 0x2c], ecx
            //   b81f85eb51           | mov                 eax, 0x51eb851f
            //   f7eb                 | imul                ebx
            //   c1fa04               | sar                 edx, 4
            //   8bca                 | mov                 ecx, edx
            //   c1e91f               | shr                 ecx, 0x1f

        $sequence_3 = { 6a00 8d7c2413 bd01000000 55 8bc7 50 53 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   8d7c2413             | lea                 edi, [esp + 0x13]
            //   bd01000000           | mov                 ebp, 1
            //   55                   | push                ebp
            //   8bc7                 | mov                 eax, edi
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_4 = { ffd0 8d8c2484040000 6800010000 51 e8???????? 83c408 }
            // n = 6, score = 100
            //   ffd0                 | call                eax
            //   8d8c2484040000       | lea                 ecx, [esp + 0x484]
            //   6800010000           | push                0x100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_5 = { 8b8510100000 3bc3 7409 50 ffd6 899d10100000 8b850c100000 }
            // n = 7, score = 100
            //   8b8510100000         | mov                 eax, dword ptr [ebp + 0x1010]
            //   3bc3                 | cmp                 eax, ebx
            //   7409                 | je                  0xb
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   899d10100000         | mov                 dword ptr [ebp + 0x1010], ebx
            //   8b850c100000         | mov                 eax, dword ptr [ebp + 0x100c]

        $sequence_6 = { 8b7508 8b8688300000 50 ff15???????? 5f 5e }
            // n = 6, score = 100
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   8b8688300000         | mov                 eax, dword ptr [esi + 0x3088]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_7 = { 50 52 51 83c004 50 e8???????? 8b8e70300000 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   52                   | push                edx
            //   51                   | push                ecx
            //   83c004               | add                 eax, 4
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b8e70300000         | mov                 ecx, dword ptr [esi + 0x3070]

        $sequence_8 = { 740d 50 ffd7 c7869440000000000000 8b8690400000 85c0 740d }
            // n = 7, score = 100
            //   740d                 | je                  0xf
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   c7869440000000000000     | mov    dword ptr [esi + 0x4094], 0
            //   8b8690400000         | mov                 eax, dword ptr [esi + 0x4090]
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf

        $sequence_9 = { 50 8b4204 ffd0 57 8d8c2470040000 51 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   ffd0                 | call                eax
            //   57                   | push                edi
            //   8d8c2470040000       | lea                 ecx, [esp + 0x470]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 581632
}