rule win_bunnyloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bunnyloader."
        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.bunnyloader"
        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 = { eb2c a812 7413 83790800 740d e8???????? 8bf0 }
            // n = 7, score = 100
            //   eb2c                 | jmp                 0x2e
            //   a812                 | test                al, 0x12
            //   7413                 | je                  0x15
            //   83790800             | cmp                 dword ptr [ecx + 8], 0
            //   740d                 | je                  0xf
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_1 = { e8???????? 8b5580 0fb7c0 8b8d24ffffff 0fb7c0 83c002 2bf8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b5580               | mov                 edx, dword ptr [ebp - 0x80]
            //   0fb7c0               | movzx               eax, ax
            //   8b8d24ffffff         | mov                 ecx, dword ptr [ebp - 0xdc]
            //   0fb7c0               | movzx               eax, ax
            //   83c002               | add                 eax, 2
            //   2bf8                 | sub                 edi, eax

        $sequence_2 = { 8b442428 83c408 89442458 eb4f 8b4e6c 394e70 7f18 }
            // n = 7, score = 100
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   83c408               | add                 esp, 8
            //   89442458             | mov                 dword ptr [esp + 0x58], eax
            //   eb4f                 | jmp                 0x51
            //   8b4e6c               | mov                 ecx, dword ptr [esi + 0x6c]
            //   394e70               | cmp                 dword ptr [esi + 0x70], ecx
            //   7f18                 | jg                  0x1a

        $sequence_3 = { e8???????? 8be5 5d c3 3c02 754e 837d0c00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   3c02                 | cmp                 al, 2
            //   754e                 | jne                 0x50
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0

        $sequence_4 = { f7471c00000100 0f842f010000 8b5508 85d2 0f85a2000000 8b0e 385157 }
            // n = 7, score = 100
            //   f7471c00000100       | test                dword ptr [edi + 0x1c], 0x10000
            //   0f842f010000         | je                  0x135
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   85d2                 | test                edx, edx
            //   0f85a2000000         | jne                 0xa8
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   385157               | cmp                 byte ptr [ecx + 0x57], dl

        $sequence_5 = { 85c9 0f85eb020000 8b5db0 68???????? 53 e8???????? 8b0b }
            // n = 7, score = 100
            //   85c9                 | test                ecx, ecx
            //   0f85eb020000         | jne                 0x2f1
            //   8b5db0               | mov                 ebx, dword ptr [ebp - 0x50]
            //   68????????           |                     
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b0b                 | mov                 ecx, dword ptr [ebx]

        $sequence_6 = { ff74243c 56 e8???????? 83c40c c6043e00 eb02 33f6 }
            // n = 7, score = 100
            //   ff74243c             | push                dword ptr [esp + 0x3c]
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c6043e00             | mov                 byte ptr [esi + edi], 0
            //   eb02                 | jmp                 4
            //   33f6                 | xor                 esi, esi

        $sequence_7 = { eb04 8bd9 2bdf 53 57 ff75e4 83c204 }
            // n = 7, score = 100
            //   eb04                 | jmp                 6
            //   8bd9                 | mov                 ebx, ecx
            //   2bdf                 | sub                 ebx, edi
            //   53                   | push                ebx
            //   57                   | push                edi
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   83c204               | add                 edx, 4

        $sequence_8 = { e8???????? 6a00 8906 e8???????? 83c40c 8b36 85f6 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   6a00                 | push                0
            //   8906                 | mov                 dword ptr [esi], eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   85f6                 | test                esi, esi

        $sequence_9 = { eb11 0f57c0 660f13442420 8b5c2420 895c2414 85ff 7432 }
            // n = 7, score = 100
            //   eb11                 | jmp                 0x13
            //   0f57c0               | xorps               xmm0, xmm0
            //   660f13442420         | movlpd              qword ptr [esp + 0x20], xmm0
            //   8b5c2420             | mov                 ebx, dword ptr [esp + 0x20]
            //   895c2414             | mov                 dword ptr [esp + 0x14], ebx
            //   85ff                 | test                edi, edi
            //   7432                 | je                  0x34

    condition:
        7 of them and filesize < 2998272
}