rule win_breakthrough_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.breakthrough_loader."
        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.breakthrough_loader"
        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 = { 8a8008394400 8807 47 41 898d70ffffff 8b55b0 8b8d74ffffff }
            // n = 7, score = 100
            //   8a8008394400         | mov                 al, byte ptr [eax + 0x443908]
            //   8807                 | mov                 byte ptr [edi], al
            //   47                   | inc                 edi
            //   41                   | inc                 ecx
            //   898d70ffffff         | mov                 dword ptr [ebp - 0x90], ecx
            //   8b55b0               | mov                 edx, dword ptr [ebp - 0x50]
            //   8b8d74ffffff         | mov                 ecx, dword ptr [ebp - 0x8c]

        $sequence_1 = { 57 8d3c8548374500 8b0f 85c9 740b 8d4101 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   8d3c8548374500       | lea                 edi, [eax*4 + 0x453748]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   85c9                 | test                ecx, ecx
            //   740b                 | je                  0xd
            //   8d4101               | lea                 eax, [ecx + 1]

        $sequence_2 = { 89049d40354500 85c0 742f 8305????????40 8bfb c1e706 57 }
            // n = 7, score = 100
            //   89049d40354500       | mov                 dword ptr [ebx*4 + 0x453540], eax
            //   85c0                 | test                eax, eax
            //   742f                 | je                  0x31
            //   8305????????40       |                     
            //   8bfb                 | mov                 edi, ebx
            //   c1e706               | shl                 edi, 6
            //   57                   | push                edi

        $sequence_3 = { 8a81402b4500 8845dc ff75dc 8b89382b4500 e8???????? 83f8ff 750e }
            // n = 7, score = 100
            //   8a81402b4500         | mov                 al, byte ptr [ecx + 0x452b40]
            //   8845dc               | mov                 byte ptr [ebp - 0x24], al
            //   ff75dc               | push                dword ptr [ebp - 0x24]
            //   8b89382b4500         | mov                 ecx, dword ptr [ecx + 0x452b38]
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   750e                 | jne                 0x10

        $sequence_4 = { 56 e8???????? 8b4dd8 83c40c eb54 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   83c40c               | add                 esp, 0xc
            //   eb54                 | jmp                 0x56

        $sequence_5 = { 83fe06 7ce7 8d8c2490000000 c747072e657865 c6470b00 e8???????? }
            // n = 6, score = 100
            //   83fe06               | cmp                 esi, 6
            //   7ce7                 | jl                  0xffffffe9
            //   8d8c2490000000       | lea                 ecx, [esp + 0x90]
            //   c747072e657865       | mov                 dword ptr [edi + 7], 0x6578652e
            //   c6470b00             | mov                 byte ptr [edi + 0xb], 0
            //   e8????????           |                     

        $sequence_6 = { 6bd030 8b45fc 03148d40354500 8b00 894218 8a03 884228 }
            // n = 7, score = 100
            //   6bd030               | imul                edx, eax, 0x30
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   03148d40354500       | add                 edx, dword ptr [ecx*4 + 0x453540]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   894218               | mov                 dword ptr [edx + 0x18], eax
            //   8a03                 | mov                 al, byte ptr [ebx]
            //   884228               | mov                 byte ptr [edx + 0x28], al

        $sequence_7 = { 8b0cb540354500 83c410 8985f4efffff 8bc2 8b95f4efffff }
            // n = 5, score = 100
            //   8b0cb540354500       | mov                 ecx, dword ptr [esi*4 + 0x453540]
            //   83c410               | add                 esp, 0x10
            //   8985f4efffff         | mov                 dword ptr [ebp - 0x100c], eax
            //   8bc2                 | mov                 eax, edx
            //   8b95f4efffff         | mov                 edx, dword ptr [ebp - 0x100c]

        $sequence_8 = { 8d85c8d6ffff 6810270000 6a00 50 }
            // n = 4, score = 100
            //   8d85c8d6ffff         | lea                 eax, [ebp - 0x2938]
            //   6810270000           | push                0x2710
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_9 = { 8b45fc 53 8901 e8???????? 8b45f8 83c404 5f }
            // n = 7, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   53                   | push                ebx
            //   8901                 | mov                 dword ptr [ecx], eax
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 753664
}