rule win_unidentified_077_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.unidentified_077."
        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_077"
        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 = { 4885c0 750e ff15???????? 418907 e9???????? ba30750000 }
            // n = 6, score = 600
            //   4885c0               | xor                 ecx, ecx
            //   750e                 | dec                 eax
            //   ff15????????         |                     
            //   418907               | lea                 edx, [ebp + 0x2c0]
            //   e9????????           |                     
            //   ba30750000           | dec                 eax

        $sequence_1 = { 2bc8 0f841f050000 8d41ff 8b8482e8400100 85c0 0f8489000000 83f801 }
            // n = 7, score = 600
            //   2bc8                 | jb                  0x5c9
            //   0f841f050000         | dec                 eax
            //   8d41ff               | lea                 edx, [ebp + 0x4d0]
            //   8b8482e8400100       | mov                 dword ptr [eax], 0x22
            //   85c0                 | mov                 eax, dword ptr [esp + 0x40]
            //   0f8489000000         | add                 ebx, eax
            //   83f801               | test                eax, eax

        $sequence_2 = { 488d4001 4883ea01 75f3 498bd0 488bcb e8???????? b9c0d40100 }
            // n = 7, score = 600
            //   488d4001             | lea                 ecx, [0xffffcb2a]
            //   4883ea01             | dec                 eax
            //   75f3                 | test                ebx, ebx
            //   498bd0               | jne                 0x3cf
            //   488bcb               | dec                 eax
            //   e8????????           |                     
            //   b9c0d40100           | mov                 ebx, ecx

        $sequence_3 = { 2bcb 3bc8 7653 8bd1 }
            // n = 4, score = 600
            //   2bcb                 | inc                 esp
            //   3bc8                 | cmp                 edi, edx
            //   7653                 | jl                  0xffffff67
            //   8bd1                 | dec                 esp

        $sequence_4 = { 0fb68c8252400100 0fb6b48253400100 8bd9 8bf8 33d2 }
            // n = 5, score = 600
            //   0fb68c8252400100     | mov                 ecx, edi
            //   0fb6b48253400100     | int                 0x29
            //   8bd9                 | dec                 eax
            //   8bf8                 | lea                 ecx, [0x1948b]
            //   33d2                 | dec                 eax

        $sequence_5 = { 498b9cf740c70100 4885db 7407 483bdf 747a eb73 }
            // n = 6, score = 600
            //   498b9cf740c70100     | dec                 eax
            //   4885db               | test                eax, eax
            //   7407                 | dec                 eax
            //   483bdf               | mov                 eax, edi
            //   747a                 | dec                 ecx
            //   eb73                 | xchg                dword ptr [edi + esi*8 + 0x1c740], eax

        $sequence_6 = { 03c0 2bc8 0f8497000000 8d41ff 8b8482e8400100 85c0 7462 }
            // n = 7, score = 600
            //   03c0                 | cmp                 ebp, edx
            //   2bc8                 | jae                 0x782
            //   0f8497000000         | mov                 eax, dword ptr [esp + 0x40]
            //   8d41ff               | add                 ebx, eax
            //   8b8482e8400100       | test                eax, eax
            //   85c0                 | jne                 0x6a1
            //   7462                 | dec                 eax

        $sequence_7 = { 83e13f 2bd1 8aca 488bd0 48d3ca 4933d0 4b8794f7e0c70100 }
            // n = 7, score = 600
            //   83e13f               | mov                 edx, 0x7530
            //   2bd1                 | mov                 dword ptr [esp + 0x20], 0x7530
            //   8aca                 | inc                 esp
            //   488bd0               | mov                 ecx, edx
            //   48d3ca               | jne                 0xa6
            //   4933d0               | lea                 ecx, [eax + 0xe]
            //   4b8794f7e0c70100     | xor                 eax, eax

        $sequence_8 = { 33d2 89442420 33c9 ff15???????? 488bc8 83caff ff15???????? }
            // n = 7, score = 600
            //   33d2                 | shl                 esi, 2
            //   89442420             | movzx               eax, word ptr [ecx + edi*4 + 0x14050]
            //   33c9                 | dec                 eax
            //   ff15????????         |                     
            //   488bc8               | lea                 edx, [ecx + 0x13740]
            //   83caff               | dec                 eax
            //   ff15????????         |                     

        $sequence_9 = { 483bdf 747a eb73 4d8bbcf700310100 33d2 }
            // n = 5, score = 600
            //   483bdf               | inc                 eax
            //   747a                 | push                ebx
            //   eb73                 | dec                 eax
            //   4d8bbcf700310100     | sub                 esp, 0x20
            //   33d2                 | jmp                 0x1e2

    condition:
        7 of them and filesize < 270336
}