rule win_excalibur_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 83c404 56 e8???????? 83c404 8d8d7cffffff 6a0d 6a00 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d8d7cffffff         | lea                 ecx, [ebp - 0x84]
            //   6a0d                 | push                0xd
            //   6a00                 | push                0

        $sequence_1 = { 85f6 7564 8b450c 8930 3975f4 0f86aa000000 8b5d08 }
            // n = 7, score = 100
            //   85f6                 | test                esi, esi
            //   7564                 | jne                 0x66
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8930                 | mov                 dword ptr [eax], esi
            //   3975f4               | cmp                 dword ptr [ebp - 0xc], esi
            //   0f86aa000000         | jbe                 0xb0
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]

        $sequence_2 = { 50 8d85f0feffff 50 c645fc08 e8???????? 50 8d4dc0 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]
            //   50                   | push                eax
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]

        $sequence_3 = { 8d950880ffff 6a14 03d6 83c9ff ff15???????? f7d0 3b84350480ffff }
            // n = 7, score = 100
            //   8d950880ffff         | lea                 edx, [ebp - 0x7ff8]
            //   6a14                 | push                0x14
            //   03d6                 | add                 edx, esi
            //   83c9ff               | or                  ecx, 0xffffffff
            //   ff15????????         |                     
            //   f7d0                 | not                 eax
            //   3b84350480ffff       | cmp                 eax, dword ptr [ebp + esi - 0x7ffc]

        $sequence_4 = { 8d8538f9ffff 50 8d9560fbffff 8d4dd8 c645fc02 e8???????? 8bf0 }
            // n = 7, score = 100
            //   8d8538f9ffff         | lea                 eax, [ebp - 0x6c8]
            //   50                   | push                eax
            //   8d9560fbffff         | lea                 edx, [ebp - 0x4a0]
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_5 = { 68???????? 8d95ccfdffff 8d8db4fdffff c645fc01 e8???????? 8bf8 }
            // n = 6, score = 100
            //   68????????           |                     
            //   8d95ccfdffff         | lea                 edx, [ebp - 0x234]
            //   8d8db4fdffff         | lea                 ecx, [ebp - 0x24c]
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_6 = { 8945fc 53 56 57 8b7d08 8bda 8b37 }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8bda                 | mov                 ebx, edx
            //   8b37                 | mov                 esi, dword ptr [edi]

        $sequence_7 = { 75ea 5f 894624 5b 5e 8be5 5d }
            // n = 7, score = 100
            //   75ea                 | jne                 0xffffffec
            //   5f                   | pop                 edi
            //   894624               | mov                 dword ptr [esi + 0x24], eax
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_8 = { 51 68???????? 8d4dc0 e8???????? 83f8ff 0f859f070000 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   68????????           |                     
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   0f859f070000         | jne                 0x7a5

        $sequence_9 = { 8b35???????? 85c9 7411 51 ffd6 8b856cffffff 33c9 }
            // n = 7, score = 100
            //   8b35????????         |                     
            //   85c9                 | test                ecx, ecx
            //   7411                 | je                  0x13
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8b856cffffff         | mov                 eax, dword ptr [ebp - 0x94]
            //   33c9                 | xor                 ecx, ecx

    condition:
        7 of them and filesize < 1253376
}