rule win_excalibur_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { d1f9 51 57 8d4c2434 e8???????? 6a07 51 }
            // n = 7, score = 100
            //   d1f9                 | sar                 ecx, 1
            //   51                   | push                ecx
            //   57                   | push                edi
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   e8????????           |                     
            //   6a07                 | push                7
            //   51                   | push                ecx

        $sequence_1 = { e8???????? 8be5 5d c3 c70701000000 c7470401000000 f6c320 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   c70701000000         | mov                 dword ptr [edi], 1
            //   c7470401000000       | mov                 dword ptr [edi + 4], 1
            //   f6c320               | test                bl, 0x20

        $sequence_2 = { ff8db8e5ffff 0f8541fdffff 68???????? 6880000000 6a34 8d85f0e5ffff 50 }
            // n = 7, score = 100
            //   ff8db8e5ffff         | dec                 dword ptr [ebp - 0x1a48]
            //   0f8541fdffff         | jne                 0xfffffd47
            //   68????????           |                     
            //   6880000000           | push                0x80
            //   6a34                 | push                0x34
            //   8d85f0e5ffff         | lea                 eax, [ebp - 0x1a10]
            //   50                   | push                eax

        $sequence_3 = { c785d8fbffff07000000 c785d4fbffff00000000 668985c4fbffff 720e ffb588fbffff e8???????? 83c404 }
            // n = 7, score = 100
            //   c785d8fbffff07000000     | mov    dword ptr [ebp - 0x428], 7
            //   c785d4fbffff00000000     | mov    dword ptr [ebp - 0x42c], 0
            //   668985c4fbffff       | mov                 word ptr [ebp - 0x43c], ax
            //   720e                 | jb                  0x10
            //   ffb588fbffff         | push                dword ptr [ebp - 0x478]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_4 = { c745e807000000 c745e400000000 668945d4 c745fc00000000 85db 750c 33c0 }
            // n = 7, score = 100
            //   c745e807000000       | mov                 dword ptr [ebp - 0x18], 7
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0
            //   668945d4             | mov                 word ptr [ebp - 0x2c], ax
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   85db                 | test                ebx, ebx
            //   750c                 | jne                 0xe
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { c645fc06 e8???????? 83bd2cffffff10 720e ffb518ffffff e8???????? 83c404 }
            // n = 7, score = 100
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   e8????????           |                     
            //   83bd2cffffff10       | cmp                 dword ptr [ebp - 0xd4], 0x10
            //   720e                 | jb                  0x10
            //   ffb518ffffff         | push                dword ptr [ebp - 0xe8]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_6 = { 8d5508 8d8dd8feffff e8???????? 83c404 8d85c0feffff 50 }
            // n = 6, score = 100
            //   8d5508               | lea                 edx, [ebp + 8]
            //   8d8dd8feffff         | lea                 ecx, [ebp - 0x128]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d85c0feffff         | lea                 eax, [ebp - 0x140]
            //   50                   | push                eax

        $sequence_7 = { 8bfa 897de8 8bf1 c745fc00000000 c745f000000000 6a00 c746140f000000 }
            // n = 7, score = 100
            //   8bfa                 | mov                 edi, edx
            //   897de8               | mov                 dword ptr [ebp - 0x18], edi
            //   8bf1                 | mov                 esi, ecx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   6a00                 | push                0
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf

        $sequence_8 = { c645fc01 83bdd4e5ffff08 720e ffb5c0e5ffff e8???????? 83c404 83c734 }
            // n = 7, score = 100
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   83bdd4e5ffff08       | cmp                 dword ptr [ebp - 0x1a2c], 8
            //   720e                 | jb                  0x10
            //   ffb5c0e5ffff         | push                dword ptr [ebp - 0x1a40]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83c734               | add                 edi, 0x34

        $sequence_9 = { 85c0 745a 8b15???????? 8b0d???????? a1???????? 49 23ca }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   745a                 | je                  0x5c
            //   8b15????????         |                     
            //   8b0d????????         |                     
            //   a1????????           |                     
            //   49                   | dec                 ecx
            //   23ca                 | and                 ecx, edx

    condition:
        7 of them and filesize < 1253376
}