rule win_excalibur_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.excalibur."
        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.excalibur"
        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 = { 68???????? eb4c 68???????? eb45 83f801 7515 8bce }
            // n = 7, score = 100
            //   68????????           |                     
            //   eb4c                 | jmp                 0x4e
            //   68????????           |                     
            //   eb45                 | jmp                 0x47
            //   83f801               | cmp                 eax, 1
            //   7515                 | jne                 0x17
            //   8bce                 | mov                 ecx, esi

        $sequence_1 = { 81ff00000001 7315 3b5dfc 0f8385000000 0fb60b c1e008 c1e708 }
            // n = 7, score = 100
            //   81ff00000001         | cmp                 edi, 0x1000000
            //   7315                 | jae                 0x17
            //   3b5dfc               | cmp                 ebx, dword ptr [ebp - 4]
            //   0f8385000000         | jae                 0x8b
            //   0fb60b               | movzx               ecx, byte ptr [ebx]
            //   c1e008               | shl                 eax, 8
            //   c1e708               | shl                 edi, 8

        $sequence_2 = { 50 8d8d40ffffff e8???????? ba???????? 8d8d60ffffff c645fc18 e8???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d8d40ffffff         | lea                 ecx, [ebp - 0xc0]
            //   e8????????           |                     
            //   ba????????           |                     
            //   8d8d60ffffff         | lea                 ecx, [ebp - 0xa0]
            //   c645fc18             | mov                 byte ptr [ebp - 4], 0x18
            //   e8????????           |                     

        $sequence_3 = { 7505 894738 eb13 c1e002 50 8b03 }
            // n = 6, score = 100
            //   7505                 | jne                 7
            //   894738               | mov                 dword ptr [edi + 0x38], eax
            //   eb13                 | jmp                 0x15
            //   c1e002               | shl                 eax, 2
            //   50                   | push                eax
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_4 = { 8d0cb0 8b4514 8b00 8bf8 8d9b00000000 8b450c 46 }
            // n = 7, score = 100
            //   8d0cb0               | lea                 ecx, [eax + esi*4]
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8bf8                 | mov                 edi, eax
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   46                   | inc                 esi

        $sequence_5 = { 8a4804 884f04 8bc7 5f 5e 8be5 5d }
            // n = 7, score = 100
            //   8a4804               | mov                 cl, byte ptr [eax + 4]
            //   884f04               | mov                 byte ptr [edi + 4], cl
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_6 = { 89450c 3dfeffff7f 0f87f8000000 8b4e14 3bc8 7320 52 }
            // n = 7, score = 100
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   3dfeffff7f           | cmp                 eax, 0x7ffffffe
            //   0f87f8000000         | ja                  0xfe
            //   8b4e14               | mov                 ecx, dword ptr [esi + 0x14]
            //   3bc8                 | cmp                 ecx, eax
            //   7320                 | jae                 0x22
            //   52                   | push                edx

        $sequence_7 = { 8d45d4 0f4345d4 33c9 8975e4 66890c70 8b7de4 43 }
            // n = 7, score = 100
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   0f4345d4             | cmovae              eax, dword ptr [ebp - 0x2c]
            //   33c9                 | xor                 ecx, ecx
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi
            //   66890c70             | mov                 word ptr [eax + esi*2], cx
            //   8b7de4               | mov                 edi, dword ptr [ebp - 0x1c]
            //   43                   | inc                 ebx

        $sequence_8 = { 68???????? 68???????? 68???????? 68???????? e8???????? 68???????? 8d45dc }
            // n = 7, score = 100
            //   68????????           |                     
            //   68????????           |                     
            //   68????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   8d45dc               | lea                 eax, [ebp - 0x24]

        $sequence_9 = { 59 eb36 8b8530e5ffff 8b8d14e5ffff 8b0485c0324400 f644010440 7409 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   eb36                 | jmp                 0x38
            //   8b8530e5ffff         | mov                 eax, dword ptr [ebp - 0x1ad0]
            //   8b8d14e5ffff         | mov                 ecx, dword ptr [ebp - 0x1aec]
            //   8b0485c0324400       | mov                 eax, dword ptr [eax*4 + 0x4432c0]
            //   f644010440           | test                byte ptr [ecx + eax + 4], 0x40
            //   7409                 | je                  0xb

    condition:
        7 of them and filesize < 1253376
}