rule win_blackbyte_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.blackbyte."
        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.blackbyte"
        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 = { b8deffffff ffd1 488b08 4889c2 b8cfffffff ffd1 488b08 }
            // n = 7, score = 200
            //   b8deffffff           | dec                 eax
            //   ffd1                 | lea                 eax, [0x166c22]
            //   488b08               | nop                 
            //   4889c2               | dec                 eax
            //   b8cfffffff           | mov                 edi, dword ptr [esp + 0x58]
            //   ffd1                 | dec                 eax
            //   488b08               | mov                 dword ptr [edi + 0x10], ecx

        $sequence_1 = { b8d8ffffff ffd1 488b08 4889c2 b8bdffffff ffd1 488b08 }
            // n = 7, score = 200
            //   b8d8ffffff           | nop                 
            //   ffd1                 | dec                 eax
            //   488b08               | mov                 dword ptr [esp + 0x18], eax
            //   4889c2               | mov                 byte ptr [eax], 0x9d
            //   b8bdffffff           | dec                 eax
            //   ffd1                 | lea                 eax, [0x1d3b4c]
            //   488b08               | dec                 eax

        $sequence_2 = { 772d 4929d1 4829d3 4d89ca 49f7d9 49c1f93f 4c21ca }
            // n = 7, score = 200
            //   772d                 | mov                 eax, 0x66
            //   4929d1               | dec                 eax
            //   4829d3               | mov                 ebx, dword ptr [esp + 0x40]
            //   4d89ca               | dec                 eax
            //   49f7d9               | mov                 esi, dword ptr [esp + 0x50]
            //   49c1f93f             | dec                 esp
            //   4c21ca               | mov                 eax, dword ptr [esp + 0x5e8]

        $sequence_3 = { e8???????? 89f8 b91a000000 e8???????? 4889f0 b926000000 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   89f8                 | dec                 eax
            //   b91a000000           | mov                 ecx, dword ptr [esp + 0x1e80]
            //   e8????????           |                     
            //   4889f0               | nop                 dword ptr [eax]
            //   b926000000           | dec                 eax
            //   e8????????           |                     

        $sequence_4 = { 493b6610 0f8688000000 4883ec40 48896c2438 488d6c2438 4889442430 90 }
            // n = 7, score = 200
            //   493b6610             | dec                 eax
            //   0f8688000000         | mov                 dword ptr [esp + 0x600], ecx
            //   4883ec40             | dec                 eax
            //   48896c2438           | lea                 eax, [0x639e1]
            //   488d6c2438           | nop                 
            //   4889442430           | dec                 eax
            //   90                   | mov                 dword ptr [esp + 0xb0], ebx

        $sequence_5 = { 4889c2 b801000000 ffd1 488b08 4889c2 b8c5ffffff ffd1 }
            // n = 7, score = 200
            //   4889c2               | movzx               ebp, byte ptr [esp + 0x7c]
            //   b801000000           | inc                 esp
            //   ffd1                 | mov                 byte ptr [esp + 0x6a], ch
            //   488b08               | inc                 esp
            //   4889c2               | movzx               ebp, byte ptr [esp + 0x7a]
            //   b8c5ffffff           | inc                 esp
            //   ffd1                 | movzx               ebp, byte ptr [esp + 0x82]

        $sequence_6 = { 488b442460 488b5c2428 488d4c2470 bf01000000 4889fe e8???????? }
            // n = 6, score = 200
            //   488b442460           | dec                 eax
            //   488b5c2428           | lea                 edx, [ebx + 1]
            //   488d4c2470           | dec                 eax
            //   bf01000000           | mov                 edi, ecx
            //   4889fe               | dec                 eax
            //   e8????????           |                     

        $sequence_7 = { 488b7c2450 48ffc2 4839d7 7fb3 eba5 b801000000 }
            // n = 6, score = 200
            //   488b7c2450           | dec                 eax
            //   48ffc2               | mov                 eax, dword ptr [esp + 0x40]
            //   4839d7               | mov                 word ptr [edi + ebx], 0x7966
            //   7fb3                 | mov                 byte ptr [edi + ebx + 2], 0x75
            //   eba5                 | mov                 ecx, 2
            //   b801000000           | dec                 ecx

        $sequence_8 = { 4c89c9 0f1f440000 4883f801 747f 4989c0 480fafc2 4831c8 }
            // n = 7, score = 200
            //   4c89c9               | dec                 eax
            //   0f1f440000           | mov                 esi, ecx
            //   4883f801             | dec                 eax
            //   747f                 | mov                 eax, dword ptr [esp + 0x40]
            //   4989c0               | mov                 byte ptr [edi + ebx], 0xbe
            //   480fafc2             | mov                 ecx, 0xa
            //   4831c8               | dec                 ecx

        $sequence_9 = { 735e 0fb6740429 89d7 31f2 01c2 4883ff0d 733d }
            // n = 7, score = 200
            //   735e                 | mov                 dword ptr [ecx + eax], edx
            //   0fb6740429           | dec                 eax
            //   89d7                 | mov                 eax, dword ptr [esp + 0x60]
            //   31f2                 | dec                 eax
            //   01c2                 | mov                 ebx, dword ptr [esp + 0x48]
            //   4883ff0d             | dec                 eax
            //   733d                 | test                ebx, ebx

    condition:
        7 of them and filesize < 9435136
}