rule win_newcore_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.newcore_rat"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 897b04 c7430801000000 e8???????? 6a06 89430c 8d4310 8d89ac960310 }
            // n = 7, score = 100
            //   897b04               | mov                 dword ptr [ebx + 4], edi
            //   c7430801000000       | mov                 dword ptr [ebx + 8], 1
            //   e8????????           |                     
            //   6a06                 | push                6
            //   89430c               | mov                 dword ptr [ebx + 0xc], eax
            //   8d4310               | lea                 eax, [ebx + 0x10]
            //   8d89ac960310         | lea                 ecx, [ecx + 0x100396ac]

        $sequence_1 = { eb41 3d09040000 753a 8db4249c300000 }
            // n = 4, score = 100
            //   eb41                 | jmp                 0x43
            //   3d09040000           | cmp                 eax, 0x409
            //   753a                 | jne                 0x3c
            //   8db4249c300000       | lea                 esi, [esp + 0x309c]

        $sequence_2 = { 8b8610100000 85c0 740d 50 ffd7 c7861010000000000000 8b860c100000 }
            // n = 7, score = 100
            //   8b8610100000         | mov                 eax, dword ptr [esi + 0x1010]
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   c7861010000000000000     | mov    dword ptr [esi + 0x1010], 0
            //   8b860c100000         | mov                 eax, dword ptr [esi + 0x100c]

        $sequence_3 = { a1???????? 884c2428 89442424 33c9 33c0 }
            // n = 5, score = 100
            //   a1????????           |                     
            //   884c2428             | mov                 byte ptr [esp + 0x28], cl
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   33c9                 | xor                 ecx, ecx
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 8d4c241c 51 56 8984243c020000 }
            // n = 4, score = 100
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   8984243c020000       | mov                 dword ptr [esp + 0x23c], eax

        $sequence_5 = { 7409 50 e8???????? 83c404 8b866c300000 85c0 7409 }
            // n = 7, score = 100
            //   7409                 | je                  0xb
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b866c300000         | mov                 eax, dword ptr [esi + 0x306c]
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb

        $sequence_6 = { 8b8610100000 85c0 740d 50 ffd7 c7861010000000000000 }
            // n = 6, score = 100
            //   8b8610100000         | mov                 eax, dword ptr [esi + 0x1010]
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   c7861010000000000000     | mov    dword ptr [esi + 0x1010], 0

        $sequence_7 = { 8b3d???????? 50 ffd7 8b8e6c300000 51 ffd7 8b9664300000 }
            // n = 7, score = 100
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8b8e6c300000         | mov                 ecx, dword ptr [esi + 0x306c]
            //   51                   | push                ecx
            //   ffd7                 | call                edi
            //   8b9664300000         | mov                 edx, dword ptr [esi + 0x3064]

        $sequence_8 = { 740b 8b450c 8b80ac9c0310 eb09 8b450c 8b80789c0310 }
            // n = 6, score = 100
            //   740b                 | je                  0xd
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b80ac9c0310         | mov                 eax, dword ptr [eax + 0x10039cac]
            //   eb09                 | jmp                 0xb
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b80789c0310         | mov                 eax, dword ptr [eax + 0x10039c78]

        $sequence_9 = { 03d8 83f904 894c2414 7d1c 8b4c2410 8b54240c }
            // n = 6, score = 100
            //   03d8                 | add                 ebx, eax
            //   83f904               | cmp                 ecx, 4
            //   894c2414             | mov                 dword ptr [esp + 0x14], ecx
            //   7d1c                 | jge                 0x1e
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]

    condition:
        7 of them and filesize < 581632
}