rule win_evilbunny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.evilbunny."
        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.evilbunny"
        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 = { eb09 8b4df8 83c101 894df8 8b55f8 3b55fc 7d1b }
            // n = 7, score = 200
            //   eb09                 | jmp                 0xb
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   83c101               | add                 ecx, 1
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   3b55fc               | cmp                 edx, dword ptr [ebp - 4]
            //   7d1b                 | jge                 0x1d

        $sequence_1 = { 8b55f0 8b45ec 8902 8b4df0 8b55e8 895104 8b45f0 }
            // n = 7, score = 200
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8902                 | mov                 dword ptr [edx], eax
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_2 = { dd1c24 8b4508 50 e8???????? 83c40c 6afe 8b4d08 }
            // n = 7, score = 200
            //   dd1c24               | fstp                qword ptr [esp]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6afe                 | push                -2
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_3 = { c78560ffffff00000000 c745b400000000 b801000000 52 8bcd 50 8d15c4971700 }
            // n = 7, score = 200
            //   c78560ffffff00000000     | mov    dword ptr [ebp - 0xa0], 0
            //   c745b400000000       | mov                 dword ptr [ebp - 0x4c], 0
            //   b801000000           | mov                 eax, 1
            //   52                   | push                edx
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d15c4971700         | lea                 edx, [0x1797c4]

        $sequence_4 = { e8???????? 83c408 85c0 7511 68???????? 8b4d08 51 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   68????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx

        $sequence_5 = { eb6b 8b45fc 8945f8 eb76 6a02 8b4d08 51 }
            // n = 7, score = 200
            //   eb6b                 | jmp                 0x6d
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   eb76                 | jmp                 0x78
            //   6a02                 | push                2
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx

        $sequence_6 = { 8b55fc 8b8218010000 50 ff15???????? 3bf4 e8???????? 6a00 }
            // n = 7, score = 200
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b8218010000         | mov                 eax, dword ptr [edx + 0x118]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   3bf4                 | cmp                 esi, esp
            //   e8????????           |                     
            //   6a00                 | push                0

        $sequence_7 = { 894df8 8b5508 8b4238 8b4804 83c101 8b5508 8b4238 }
            // n = 7, score = 200
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b4238               | mov                 eax, dword ptr [edx + 0x38]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   83c101               | add                 ecx, 1
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b4238               | mov                 eax, dword ptr [edx + 0x38]

        $sequence_8 = { e8???????? 6a01 8b4de8 e8???????? 6800040000 8d85e4fbffff 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   6a01                 | push                1
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   e8????????           |                     
            //   6800040000           | push                0x400
            //   8d85e4fbffff         | lea                 eax, [ebp - 0x41c]
            //   50                   | push                eax

        $sequence_9 = { 8d9540ffffff 52 8b4dec 83c104 e8???????? 8b00 8945e4 }
            // n = 7, score = 200
            //   8d9540ffffff         | lea                 edx, [ebp - 0xc0]
            //   52                   | push                edx
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   83c104               | add                 ecx, 4
            //   e8????????           |                     
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

    condition:
        7 of them and filesize < 1695744
}