rule win_leouncia_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.leouncia."
        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.leouncia"
        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 = { 8bf7 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 f644300401 }
            // n = 7, score = 100
            //   8bf7                 | mov                 esi, edi
            //   c1f805               | sar                 eax, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d1c8560c14000       | lea                 ebx, [eax*4 + 0x40c160]
            //   c1e603               | shl                 esi, 3
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   f644300401           | test                byte ptr [eax + esi + 4], 1

        $sequence_1 = { c1e602 8b86f0a64000 eb09 c1e602 8b8624a74000 }
            // n = 5, score = 100
            //   c1e602               | shl                 esi, 2
            //   8b86f0a64000         | mov                 eax, dword ptr [esi + 0x40a6f0]
            //   eb09                 | jmp                 0xb
            //   c1e602               | shl                 esi, 2
            //   8b8624a74000         | mov                 eax, dword ptr [esi + 0x40a724]

        $sequence_2 = { c744244c01000000 ffd7 85c0 750e 5f 5e 5d }
            // n = 7, score = 100
            //   c744244c01000000     | mov                 dword ptr [esp + 0x4c], 1
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   750e                 | jne                 0x10
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_3 = { 8bc1 8bf1 c1f805 83e61f 8d1c8560c14000 c1e603 8b03 }
            // n = 7, score = 100
            //   8bc1                 | mov                 eax, ecx
            //   8bf1                 | mov                 esi, ecx
            //   c1f805               | sar                 eax, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d1c8560c14000       | lea                 ebx, [eax*4 + 0x40c160]
            //   c1e603               | shl                 esi, 3
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_4 = { 7229 f3a5 ff249548734000 8bc7 ba03000000 83e904 720c }
            // n = 7, score = 100
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff249548734000       | jmp                 dword ptr [edx*4 + 0x407348]
            //   8bc7                 | mov                 eax, edi
            //   ba03000000           | mov                 edx, 3
            //   83e904               | sub                 ecx, 4
            //   720c                 | jb                  0xe

        $sequence_5 = { 83c40c 80bc242401000063 7510 8d942425010000 52 }
            // n = 5, score = 100
            //   83c40c               | add                 esp, 0xc
            //   80bc242401000063     | cmp                 byte ptr [esp + 0x124], 0x63
            //   7510                 | jne                 0x12
            //   8d942425010000       | lea                 edx, [esp + 0x125]
            //   52                   | push                edx

        $sequence_6 = { 52 e8???????? 8be8 8d842448010000 50 }
            // n = 5, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   8be8                 | mov                 ebp, eax
            //   8d842448010000       | lea                 eax, [esp + 0x148]
            //   50                   | push                eax

        $sequence_7 = { c1e902 f3a5 8bca 83e103 f3a4 c644041800 }
            // n = 6, score = 100
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   c644041800           | mov                 byte ptr [esp + eax + 0x18], 0

        $sequence_8 = { 8bca 83e103 f3aa 017500 }
            // n = 4, score = 100
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   017500               | add                 dword ptr [ebp], esi

        $sequence_9 = { 47 50 897d00 c744241800040000 ff15???????? 85c0 }
            // n = 6, score = 100
            //   47                   | inc                 edi
            //   50                   | push                eax
            //   897d00               | mov                 dword ptr [ebp], edi
            //   c744241800040000     | mov                 dword ptr [esp + 0x18], 0x400
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 114688
}