rule win_quantloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.quantloader."
        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.quantloader"
        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 = { 8b45f0 89442404 c7042440000000 e8???????? 83ec08 8945ec }
            // n = 6, score = 500
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   c7042440000000       | mov                 dword ptr [esp], 0x40
            //   e8????????           |                     
            //   83ec08               | sub                 esp, 8
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax

        $sequence_1 = { 89442404 8b45f8 890424 e8???????? 83ec18 b8???????? }
            // n = 6, score = 500
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec18               | sub                 esp, 0x18
            //   b8????????           |                     

        $sequence_2 = { c70424???????? e8???????? c744240800040000 c744240400000000 c70424???????? e8???????? 8b4508 }
            // n = 7, score = 500
            //   c70424????????       |                     
            //   e8????????           |                     
            //   c744240800040000     | mov                 dword ptr [esp + 8], 0x400
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   c70424????????       |                     
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_3 = { c745ec00000000 e8???????? 8d55f4 89542408 c744240408000000 890424 e8???????? }
            // n = 7, score = 500
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   e8????????           |                     
            //   8d55f4               | lea                 edx, [ebp - 0xc]
            //   89542408             | mov                 dword ptr [esp + 8], edx
            //   c744240408000000     | mov                 dword ptr [esp + 4], 8
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_4 = { 83ec08 8945f8 837df800 7405 8b45f8 }
            // n = 5, score = 500
            //   83ec08               | sub                 esp, 8
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   837df800             | cmp                 dword ptr [ebp - 8], 0
            //   7405                 | je                  7
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_5 = { e8???????? c7442408???????? 89442404 c7042401000080 e8???????? 89442404 }
            // n = 6, score = 500
            //   e8????????           |                     
            //   c7442408????????     |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   c7042401000080       | mov                 dword ptr [esp], 0x80000001
            //   e8????????           |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax

        $sequence_6 = { 807dff00 751e c70424???????? e8???????? 89442404 }
            // n = 5, score = 500
            //   807dff00             | cmp                 byte ptr [ebp - 1], 0
            //   751e                 | jne                 0x20
            //   c70424????????       |                     
            //   e8????????           |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax

        $sequence_7 = { c744241002000000 c744240c00000000 c744240803000000 c744240400000040 8b450c 890424 }
            // n = 6, score = 500
            //   c744241002000000     | mov                 dword ptr [esp + 0x10], 2
            //   c744240c00000000     | mov                 dword ptr [esp + 0xc], 0
            //   c744240803000000     | mov                 dword ptr [esp + 8], 3
            //   c744240400000040     | mov                 dword ptr [esp + 4], 0x40000000
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   890424               | mov                 dword ptr [esp], eax

        $sequence_8 = { 8b3424 b90a000000 e8???????? 0fb70c56 5e }
            // n = 5, score = 100
            //   8b3424               | mov                 esi, dword ptr [esp]
            //   b90a000000           | mov                 ecx, 0xa
            //   e8????????           |                     
            //   0fb70c56             | movzx               ecx, word ptr [esi + edx*2]
            //   5e                   | pop                 esi

        $sequence_9 = { 7413 ad 50 83e807 }
            // n = 4, score = 100
            //   7413                 | je                  0x15
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   50                   | push                eax
            //   83e807               | sub                 eax, 7

        $sequence_10 = { 85ff 746a 03fb 57 ff5504 85c0 7504 }
            // n = 7, score = 100
            //   85ff                 | test                edi, edi
            //   746a                 | je                  0x6c
            //   03fb                 | add                 edi, ebx
            //   57                   | push                edi
            //   ff5504               | call                dword ptr [ebp + 4]
            //   85c0                 | test                eax, eax
            //   7504                 | jne                 6

        $sequence_11 = { 57 ab f3a5 64a118000000 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   64a118000000         | mov                 eax, dword ptr fs:[0x18]

        $sequence_12 = { 48 89442420 8bf8 8d0cbd08000000 64a118000000 8b702c }
            // n = 6, score = 100
            //   48                   | dec                 eax
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   8bf8                 | mov                 edi, eax
            //   8d0cbd08000000       | lea                 ecx, [edi*4 + 8]
            //   64a118000000         | mov                 eax, dword ptr fs:[0x18]
            //   8b702c               | mov                 esi, dword ptr [eax + 0x2c]

        $sequence_13 = { 55 e8???????? 5d 8bc4 ff7010 }
            // n = 5, score = 100
            //   55                   | push                ebp
            //   e8????????           |                     
            //   5d                   | pop                 ebp
            //   8bc4                 | mov                 eax, esp
            //   ff7010               | push                dword ptr [eax + 0x10]

        $sequence_14 = { c7457c00000000 81c243e15762 8b4d74 8bfe 837d6400 }
            // n = 5, score = 100
            //   c7457c00000000       | mov                 dword ptr [ebp + 0x7c], 0
            //   81c243e15762         | add                 edx, 0x6257e143
            //   8b4d74               | mov                 ecx, dword ptr [ebp + 0x74]
            //   8bfe                 | mov                 edi, esi
            //   837d6400             | cmp                 dword ptr [ebp + 0x64], 0

        $sequence_15 = { e8???????? 59 e8???????? 8974241c }
            // n = 4, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi

    condition:
        7 of them and filesize < 155648
}