rule win_threebyte_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.threebyte."
        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.threebyte"
        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 = { 6a00 ff15???????? eb51 6a00 e8???????? 83c404 50 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   eb51                 | jmp                 0x53
            //   6a00                 | push                0
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax

        $sequence_1 = { 0345f4 33c9 8a08 83f90a 7502 ebae 8b5508 }
            // n = 7, score = 200
            //   0345f4               | add                 eax, dword ptr [ebp - 0xc]
            //   33c9                 | xor                 ecx, ecx
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   83f90a               | cmp                 ecx, 0xa
            //   7502                 | jne                 4
            //   ebae                 | jmp                 0xffffffb0
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]

        $sequence_2 = { 8b8d40f7ffff ff510c b8feffffff e9???????? c785a0f7ffff00000000 eb0f }
            // n = 6, score = 200
            //   8b8d40f7ffff         | mov                 ecx, dword ptr [ebp - 0x8c0]
            //   ff510c               | call                dword ptr [ecx + 0xc]
            //   b8feffffff           | mov                 eax, 0xfffffffe
            //   e9????????           |                     
            //   c785a0f7ffff00000000     | mov    dword ptr [ebp - 0x860], 0
            //   eb0f                 | jmp                 0x11

        $sequence_3 = { e9???????? 81bda4f7ffffc8000000 0f8524020000 c78580f7ffff04000000 6a00 }
            // n = 5, score = 200
            //   e9????????           |                     
            //   81bda4f7ffffc8000000     | cmp    dword ptr [ebp - 0x85c], 0xc8
            //   0f8524020000         | jne                 0x22a
            //   c78580f7ffff04000000     | mov    dword ptr [ebp - 0x880], 4
            //   6a00                 | push                0

        $sequence_4 = { 7407 b801000000 eb7a c645e45b c645e53e c645e63e }
            // n = 6, score = 200
            //   7407                 | je                  9
            //   b801000000           | mov                 eax, 1
            //   eb7a                 | jmp                 0x7c
            //   c645e45b             | mov                 byte ptr [ebp - 0x1c], 0x5b
            //   c645e53e             | mov                 byte ptr [ebp - 0x1b], 0x3e
            //   c645e63e             | mov                 byte ptr [ebp - 0x1a], 0x3e

        $sequence_5 = { 8b855cf7ffff ff500c 8b8d74f7ffff 51 ff15???????? 8b5514 52 }
            // n = 7, score = 200
            //   8b855cf7ffff         | mov                 eax, dword ptr [ebp - 0x8a4]
            //   ff500c               | call                dword ptr [eax + 0xc]
            //   8b8d74f7ffff         | mov                 ecx, dword ptr [ebp - 0x88c]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   52                   | push                edx

        $sequence_6 = { 8985a8fcffff 83bda8fcffffff 0f85d7000000 6804010000 8d8ddcecffff 51 6a00 }
            // n = 7, score = 200
            //   8985a8fcffff         | mov                 dword ptr [ebp - 0x358], eax
            //   83bda8fcffffff       | cmp                 dword ptr [ebp - 0x358], -1
            //   0f85d7000000         | jne                 0xdd
            //   6804010000           | push                0x104
            //   8d8ddcecffff         | lea                 ecx, [ebp - 0x1324]
            //   51                   | push                ecx
            //   6a00                 | push                0

        $sequence_7 = { 8b55a8 8b4204 8945e4 8b4da8 8b5108 8955e8 8b45a8 }
            // n = 7, score = 200
            //   8b55a8               | mov                 edx, dword ptr [ebp - 0x58]
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]
            //   8b5108               | mov                 edx, dword ptr [ecx + 8]
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   8b45a8               | mov                 eax, dword ptr [ebp - 0x58]

        $sequence_8 = { e9???????? 6a07 8d8dfcfdffff 51 68???????? e8???????? 83c40c }
            // n = 7, score = 200
            //   e9????????           |                     
            //   6a07                 | push                7
            //   8d8dfcfdffff         | lea                 ecx, [ebp - 0x204]
            //   51                   | push                ecx
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_9 = { 7d66 8b4d08 038df8feffff 8b95f4feffff 8a01 }
            // n = 5, score = 200
            //   7d66                 | jge                 0x68
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   038df8feffff         | add                 ecx, dword ptr [ebp - 0x108]
            //   8b95f4feffff         | mov                 edx, dword ptr [ebp - 0x10c]
            //   8a01                 | mov                 al, byte ptr [ecx]

    condition:
        7 of them and filesize < 180224
}