rule win_unidentified_103_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.unidentified_103."
        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.unidentified_103"
        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 = { 8b442470 c744243008000000 c744243400000000 89442418 8b44246c 89442414 8d442430 }
            // n = 7, score = 100
            //   8b442470             | movzx               edx, byte ptr [eax]
            //   c744243008000000     | add                 eax, 1
            //   c744243400000000     | add                 ecx, 1
            //   89442418             | mov                 byte ptr [ecx - 1], dl
            //   8b44246c             | mov                 eax, dword ptr [esp + 0x70]
            //   89442414             | lea                 ecx, [edi + 4]
            //   8d442430             | add                 ebx, eax

        $sequence_1 = { 8bbc2444010000 897c241c 8bbc2440010000 897c2418 }
            // n = 4, score = 100
            //   8bbc2444010000       | mov                 dword ptr [eax + 0x18], edi
            //   897c241c             | mov                 edi, dword ptr [esp + 0x148]
            //   8bbc2440010000       | mov                 dword ptr [eax + 0x1c], edi
            //   897c2418             | mov                 edi, dword ptr [esp + 0x144]

        $sequence_2 = { 8b742460 8b7c2464 896c2410 8b442440 }
            // n = 4, score = 100
            //   8b742460             | mov                 edi, dword ptr [esp + 0x64]
            //   8b7c2464             | mov                 dword ptr [esp + 0xc], ebp
            //   896c2410             | mov                 ebp, dword ptr [esp + 0x68]
            //   8b442440             | mov                 esi, dword ptr [esp + 0x60]

        $sequence_3 = { c744240401000000 c7042402000000 ff9424ec010000 83ec0c 8906 83f8ff }
            // n = 6, score = 100
            //   c744240401000000     | test                eax, eax
            //   c7042402000000       | mov                 dword ptr [esp + 4], 1
            //   ff9424ec010000       | mov                 dword ptr [esp], 0x400
            //   83ec0c               | call                eax
            //   8906                 | sub                 esp, 0xc
            //   83f8ff               | mov                 ebx, eax

        $sequence_4 = { 85c0 75e2 8b3c24 89f2 }
            // n = 4, score = 100
            //   85c0                 | jne                 0xffffffe1
            //   75e2                 | mov                 edx, dword ptr [ebp]
            //   8b3c24               | mov                 eax, dword ptr [edx + 0x28]
            //   89f2                 | test                eax, eax

        $sequence_5 = { e8???????? 31c0 c78424ec05000063686370 c78424f005000020363530 c78424f405000030310a00 83c001 803c0300 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   31c0                 | mov                 eax, edx
            //   c78424ec05000063686370     | shl    eax, 5
            //   c78424f005000020363530     | sub    eax, edx
            //   c78424f405000030310a00     | sub    ebx, eax
            //   83c001               | shr                 edi, 1
            //   803c0300             | lea                 esi, [eax + edi*8]

        $sequence_6 = { 897828 8bbc2458010000 89782c 8bbc245c010000 897830 8bbc2480010000 897834 }
            // n = 7, score = 100
            //   897828               | mov                 edi, dword ptr [esp + 0x154]
            //   8bbc2458010000       | mov                 dword ptr [eax + 0x28], edi
            //   89782c               | mov                 edi, dword ptr [esp + 0x158]
            //   8bbc245c010000       | mov                 dword ptr [eax + 0x2c], edi
            //   897830               | mov                 dword ptr [eax + 0x20], edi
            //   8bbc2480010000       | mov                 edi, dword ptr [esp + 0x154]
            //   897834               | mov                 dword ptr [eax + 0xc], esi

        $sequence_7 = { 396a04 75e2 8b4210 85c0 7514 8b07 8b5f3c }
            // n = 7, score = 100
            //   396a04               | je                  0x12
            //   75e2                 | mov                 eax, esi
            //   8b4210               | xor                 edx, edx
            //   85c0                 | div                 ebx
            //   7514                 | test                edx, edx
            //   8b07                 | jne                 0xffffffd9
            //   8b5f3c               | cmp                 dword ptr [esp + 0x2c], ebx

        $sequence_8 = { 891c24 89442404 e8???????? 83c420 89f8 5b 5e }
            // n = 7, score = 100
            //   891c24               | mov                 dword ptr [esp + 4], eax
            //   89442404             | mov                 dword ptr [esp + 0xf6], 0x7262694c
            //   e8????????           |                     
            //   83c420               | mov                 dword ptr [esp + 0xfa], 0x41797261
            //   89f8                 | mov                 dword ptr [esp], ebx
            //   5b                   | mov                 dword ptr [esp + 0xc2], 0x65657246
            //   5e                   | mov                 dword ptr [esp], ebx

        $sequence_9 = { 89742404 892c24 89c2 80ce02 81e300000004 0f45c2 8d54241c }
            // n = 7, score = 100
            //   89742404             | mov                 eax, dword ptr [esp + eax + 0xbcc]
            //   892c24               | mov                 eax, dword ptr [eax]
            //   89c2                 | mov                 dword ptr [esp], eax
            //   80ce02               | mov                 eax, dword ptr [esp + 0x110]
            //   81e300000004         | mov                 dword ptr [esp + 4], esi
            //   0f45c2               | mov                 dword ptr [esp], eax
            //   8d54241c             | mov                 eax, dword ptr [esp + 0x64]

    condition:
        7 of them and filesize < 188416
}