rule win_lightbunny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.lightbunny."
        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.lightbunny"
        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 = { 56 ff15???????? 85c0 7e59 }
            // n = 4, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7e59                 | jle                 0x5b

        $sequence_1 = { 8b400c 8b00 ff30 ff15???????? eb02 }
            // n = 5, score = 100
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   ff30                 | push                dword ptr [eax]
            //   ff15????????         |                     
            //   eb02                 | jmp                 4

        $sequence_2 = { 6a32 ff15???????? 8bcf e8???????? 8bf0 85f6 75e2 }
            // n = 7, score = 100
            //   6a32                 | push                0x32
            //   ff15????????         |                     
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   75e2                 | jne                 0xffffffe4

        $sequence_3 = { 8975cc 8d041f 8975d0 8975e0 8975f0 c745f4c4424100 }
            // n = 6, score = 100
            //   8975cc               | mov                 dword ptr [ebp - 0x34], esi
            //   8d041f               | lea                 eax, [edi + ebx]
            //   8975d0               | mov                 dword ptr [ebp - 0x30], esi
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   c745f4c4424100       | mov                 dword ptr [ebp - 0xc], 0x4142c4

        $sequence_4 = { 85c0 0f45cf 890d???????? 833d????????00 7458 }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   0f45cf               | cmovne              ecx, edi
            //   890d????????         |                     
            //   833d????????00       |                     
            //   7458                 | je                  0x5a

        $sequence_5 = { 5d c3 8b04c5fc3b4100 5d c3 8bff }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b04c5fc3b4100       | mov                 eax, dword ptr [eax*8 + 0x413bfc]
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi

        $sequence_6 = { ff75f4 68???????? e8???????? 8b4df4 83c40c }
            // n = 5, score = 100
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   68????????           |                     
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   83c40c               | add                 esp, 0xc

        $sequence_7 = { 83e4f0 81ecb8020000 a1???????? 33c4 898424b4020000 837d0803 8b450c }
            // n = 7, score = 100
            //   83e4f0               | and                 esp, 0xfffffff0
            //   81ecb8020000         | sub                 esp, 0x2b8
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   898424b4020000       | mov                 dword ptr [esp + 0x2b4], eax
            //   837d0803             | cmp                 dword ptr [ebp + 8], 3
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_8 = { 8bf1 ff15???????? 894614 83f8ff 751e 68???????? e8???????? }
            // n = 7, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   ff15????????         |                     
            //   894614               | mov                 dword ptr [esi + 0x14], eax
            //   83f8ff               | cmp                 eax, -1
            //   751e                 | jne                 0x20
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_9 = { 6a26 58 0fb60c855e774100 0fb634855f774100 8bf9 8985b4f8ffff c1e702 }
            // n = 7, score = 100
            //   6a26                 | push                0x26
            //   58                   | pop                 eax
            //   0fb60c855e774100     | movzx               ecx, byte ptr [eax*4 + 0x41775e]
            //   0fb634855f774100     | movzx               esi, byte ptr [eax*4 + 0x41775f]
            //   8bf9                 | mov                 edi, ecx
            //   8985b4f8ffff         | mov                 dword ptr [ebp - 0x74c], eax
            //   c1e702               | shl                 edi, 2

    condition:
        7 of them and filesize < 2376704
}