rule win_blackbyte_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 488b442418 488b5c2410 e8???????? 488b4c2420 488b01 440f117c2428 488d5c2428 }
            // n = 7, score = 200
            //   488b442418           | mov                 byte ptr [esp + 0x53], ch
            //   488b5c2410           | inc                 esp
            //   e8????????           |                     
            //   488b4c2420           | movzx               ebp, byte ptr [esp + 0x64]
            //   488b01               | inc                 esp
            //   440f117c2428         | mov                 byte ptr [esp + 0x52], ch
            //   488d5c2428           | inc                 esp

        $sequence_1 = { e8???????? 4889442460 48895c2428 e8???????? 440f117c2470 4889442470 48895c2478 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   4889442460           | mov                 byte ptr [eax], 0x7a
            //   48895c2428           | dec                 eax
            //   e8????????           |                     
            //   440f117c2470         | lea                 eax, [0x3dfac]
            //   4889442470           | dec                 eax
            //   48895c2478           | lea                 ebp, [esp + 0x30]

        $sequence_2 = { 488d7101 488935???????? 48c1e104 48895c0a08 488d3c0a 833d????????00 7507 }
            // n = 7, score = 200
            //   488d7101             | xor                 edx, edx
            //   488935????????       |                     
            //   48c1e104             | xor                 ebx, ebx
            //   48895c0a08           | dec                 eax
            //   488d3c0a             | mov                 dword ptr [esp + 0x60], ebp
            //   833d????????00       |                     
            //   7507                 | dec                 eax

        $sequence_3 = { 735c 0fb6740433 89d7 31f2 01c2 4883ff15 }
            // n = 6, score = 200
            //   735c                 | mov                 dword ptr [esp + 0x68], eax
            //   0fb6740433           | dec                 eax
            //   89d7                 | lea                 eax, [0x123825]
            //   31f2                 | dec                 eax
            //   01c2                 | mov                 ecx, ebx
            //   4883ff15             | dec                 eax

        $sequence_4 = { 4881c490000000 c3 31c0 4889d9 e8???????? 90 4889442408 }
            // n = 7, score = 200
            //   4881c490000000       | movzx               edx, byte ptr [esp + 0x57]
            //   c3                   | inc                 esp
            //   31c0                 | add                 edx, eax
            //   4889d9               | mov                 byte ptr [eax + 0xe], dl
            //   e8????????           |                     
            //   90                   | movzx               edx, byte ptr [esp + 0x5d]
            //   4889442408           | inc                 esp

        $sequence_5 = { 488d7818 488b4c2460 e8???????? 488b4c2420 48894810 833d????????00 7512 }
            // n = 7, score = 200
            //   488d7818             | dec                 eax
            //   488b4c2460           | shl                 ecx, 4
            //   e8????????           |                     
            //   488b4c2420           | dec                 eax
            //   48894810             | lea                 ebx, [0x192f35]
            //   833d????????00       |                     
            //   7512                 | dec                 eax

        $sequence_6 = { 488b542450 488b5c2448 4889c7 4889ce 488b442440 c6041f66 b902000000 }
            // n = 7, score = 200
            //   488b542450           | inc                 esp
            //   488b5c2448           | movzx               ebp, byte ptr [esp + 0xc6]
            //   4889c7               | inc                 esp
            //   4889ce               | mov                 byte ptr [esp + 0x7d], ch
            //   488b442440           | inc                 esp
            //   c6041f66             | movzx               ebp, byte ptr [esp + 0xc7]
            //   b902000000           | inc                 esp

        $sequence_7 = { 7534 4889442418 48c744242000000000 488d7c2428 488d7ff0 48896c24f0 488d6c24f0 }
            // n = 7, score = 200
            //   7534                 | mov                 byte ptr [edi + ebx], 0xe9
            //   4889442418           | mov                 ecx, 2
            //   48c744242000000000     | dec    eax
            //   488d7c2428           | mov                 ebx, dword ptr [esp + 0x48]
            //   488d7ff0             | dec                 eax
            //   48896c24f0           | mov                 edi, eax
            //   488d6c24f0           | dec                 eax

        $sequence_8 = { e8???????? 0f1f00 4885c0 0f85d0000000 488b542460 488b5220 488b4218 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   0f1f00               | ret                 
            //   4885c0               | dec                 esp
            //   0f85d0000000         | mov                 edx, dword ptr [esp + 0x128]
            //   488b542460           | dec                 eax
            //   488b5220             | lea                 edi, [0x1f78cf]
            //   488b4218             | movzx               ebx, word ptr [edi + ebx*2]

        $sequence_9 = { 488d5c241a b906000000 e8???????? 488b6c2428 4883c430 c3 89f0 }
            // n = 7, score = 200
            //   488d5c241a           | dec                 eax
            //   b906000000           | mov                 dword ptr [esp + 0x38], ebx
            //   e8????????           |                     
            //   488b6c2428           | dec                 eax
            //   4883c430             | lea                 eax, [0x24ddf9]
            //   c3                   | mov                 ebx, 4
            //   89f0                 | dec                 eax

    condition:
        7 of them and filesize < 9435136
}