rule win_blackbyte_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 4488ac2489000000 440fb6ac24c4000000 4488ac2488000000 440fb6ac24c5000000 4488ac2487000000 440fb6ac24c6000000 4488ac2486000000 }
            // n = 7, score = 200
            //   4488ac2489000000     | inc                 esp
            //   440fb6ac24c4000000     | movzx    ebp, byte ptr [esp + 0xa4]
            //   4488ac2488000000     | inc                 esp
            //   440fb6ac24c5000000     | mov    byte ptr [esp + 0x6a], ch
            //   4488ac2487000000     | inc                 esp
            //   440fb6ac24c6000000     | mov    byte ptr [esp + 0x6d], ch
            //   4488ac2486000000     | inc                 esp

        $sequence_1 = { b8fbffffff ffd1 488b08 4889c2 b80b000000 ffd1 488b08 }
            // n = 7, score = 200
            //   b8fbffffff           | cmp                 esi, eax
            //   ffd1                 | jae                 0x710
            //   488b08               | dec                 eax
            //   4889c2               | lea                 eax, [0xc0e73]
            //   b80b000000           | dec                 eax
            //   ffd1                 | mov                 ecx, ebx
            //   488b08               | dec                 eax

        $sequence_2 = { b8f6ffffff ffd1 488b08 4889c2 b8e9ffffff ffd1 488b08 }
            // n = 7, score = 200
            //   b8f6ffffff           | mov                 edi, esi
            //   ffd1                 | dec                 esp
            //   488b08               | lea                 eax, [ebx + 1]
            //   4889c2               | dec                 esp
            //   b8e9ffffff           | cmp                 esi, eax
            //   ffd1                 | jae                 0x18ce
            //   488b08               | dec                 eax

        $sequence_3 = { 7ce6 31c0 488d5c241a b937000000 e8???????? 488bac2488000000 4881c490000000 }
            // n = 7, score = 200
            //   7ce6                 | dec                 esp
            //   31c0                 | mov                 esi, eax
            //   488d5c241a           | dec                 esp
            //   b937000000           | cmp                 esi, eax
            //   e8????????           |                     
            //   488bac2488000000     | jae                 0x319
            //   4881c490000000       | dec                 eax

        $sequence_4 = { 4c89642418 4889542420 4889cb 488b8c24d8000000 e8???????? 48898424d8000000 48899c24d0000000 }
            // n = 7, score = 200
            //   4c89642418           | dec                 eax
            //   4889542420           | mov                 dword ptr [eax], 0
            //   4889cb               | dec                 eax
            //   488b8c24d8000000     | lea                 eax, [0x18ce94]
            //   e8????????           |                     
            //   48898424d8000000     | dec                 eax
            //   48899c24d0000000     | mov                 dword ptr [esp + 0x20], eax

        $sequence_5 = { 488b08 4889c2 b822000000 ffd1 488b08 4889c2 b8ffffffff }
            // n = 7, score = 200
            //   488b08               | cmp                 eax, 2
            //   4889c2               | dec                 eax
            //   b822000000           | mov                 edi, eax
            //   ffd1                 | dec                 eax
            //   488b08               | mov                 esi, ecx
            //   4889c2               | dec                 eax
            //   b8ffffffff           | mov                 eax, dword ptr [esp + 0x40]

        $sequence_6 = { b801000000 ffd1 488b08 4889c2 b8edffffff ffd1 488b08 }
            // n = 7, score = 200
            //   b801000000           | mov                 edi, dword ptr [esp + 0x308]
            //   ffd1                 | dec                 eax
            //   488b08               | mov                 dword ptr [edi + 0x10], ecx
            //   4889c2               | dec                 esp
            //   b8edffffff           | mov                 ebx, ebx
            //   ffd1                 | dec                 esp
            //   488b08               | mov                 ecx, ecx

        $sequence_7 = { 7534 4889442418 48c744242000000000 488d7c2428 488d7ff0 48896c24f0 488d6c24f0 }
            // n = 7, score = 200
            //   7534                 | mov                 dword ptr [esp + 0x30], edi
            //   4889442418           | dec                 eax
            //   48c744242000000000     | mov    dword ptr [esp + 0x48], edx
            //   488d7c2428           | dec                 eax
            //   488d7ff0             | mov                 dword ptr [esp + 0x58], esi
            //   48896c24f0           | xor                 eax, eax
            //   488d6c24f0           | dec                 ecx

        $sequence_8 = { 833d????????00 7506 4c890418 eb05 e8???????? 4d8d4301 4c39c1 }
            // n = 7, score = 200
            //   833d????????00       |                     
            //   7506                 | dec                 eax
            //   4c890418             | mov                 ebx, edi
            //   eb05                 | dec                 eax
            //   e8????????           |                     
            //   4d8d4301             | mov                 edi, esi
            //   4c39c1               | dec                 esp

        $sequence_9 = { 4889c2 b806000000 ffd1 488b08 4889c2 b8faffffff ffd1 }
            // n = 7, score = 200
            //   4889c2               | mov                 dword ptr [esp + 0x1a0], ebx
            //   b806000000           | dec                 eax
            //   ffd1                 | mov                 dword ptr [esp + 0x1008], eax
            //   488b08               | dec                 eax
            //   4889c2               | mov                 dword ptr [esp + 0x228], ebx
            //   b8faffffff           | dec                 eax
            //   ffd1                 | mov                 dword ptr [esp + 0x2320], ecx

    condition:
        7 of them and filesize < 9435136
}