rule win_quantloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.quantloader"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 89e5 83ec28 c745fc01000000 8d45f8 89442408 8b450c 89442404 }
            // n = 7, score = 500
            //   89e5                 | mov                 ebp, esp
            //   83ec28               | sub                 esp, 0x28
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   89442404             | mov                 dword ptr [esp + 4], eax

        $sequence_1 = { 8945fc c7442404???????? 8b45fc 890424 e8???????? }
            // n = 5, score = 500
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   c7442404????????     |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_2 = { e8???????? c70424???????? e8???????? 0fb6c0 83f801 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   c70424????????       |                     
            //   e8????????           |                     
            //   0fb6c0               | movzx               eax, al
            //   83f801               | cmp                 eax, 1

        $sequence_3 = { e8???????? 83ec08 8b00 8945fc 837df400 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   83ec08               | sub                 esp, 8
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0

        $sequence_4 = { 55 89e5 81ec18020000 8d85f8fdffff }
            // n = 4, score = 500
            //   55                   | push                ebp
            //   89e5                 | mov                 ebp, esp
            //   81ec18020000         | sub                 esp, 0x218
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]

        $sequence_5 = { e8???????? c685f8fdffff00 e8???????? 89442404 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   c685f8fdffff00       | mov                 byte ptr [ebp - 0x208], 0
            //   e8????????           |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax

        $sequence_6 = { 83ec28 c70424???????? e8???????? c745fc01000000 c745f800000000 c745f400040000 }
            // n = 6, score = 500
            //   83ec28               | sub                 esp, 0x28
            //   c70424????????       |                     
            //   e8????????           |                     
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   c745f400040000       | mov                 dword ptr [ebp - 0xc], 0x400

        $sequence_7 = { 89e5 83ec18 c70424???????? e8???????? 83ec04 8945fc 837dfc00 }
            // n = 7, score = 500
            //   89e5                 | mov                 ebp, esp
            //   83ec18               | sub                 esp, 0x18
            //   c70424????????       |                     
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0

        $sequence_8 = { 64a118000000 8f402c 61 c3 60 81ec20020000 b824020000 }
            // n = 7, score = 100
            //   64a118000000         | mov                 eax, dword ptr fs:[0x18]
            //   8f402c               | pop                 dword ptr [eax + 0x2c]
            //   61                   | popal               
            //   c3                   | ret                 
            //   60                   | pushal              
            //   81ec20020000         | sub                 esp, 0x220
            //   b824020000           | mov                 eax, 0x224

        $sequence_9 = { 59 8b490c 8b490c 8b09 33c0 39411c 74f7 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8b490c               | mov                 ecx, dword ptr [ecx + 0xc]
            //   8b490c               | mov                 ecx, dword ptr [ecx + 0xc]
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   33c0                 | xor                 eax, eax
            //   39411c               | cmp                 dword ptr [ecx + 0x1c], eax
            //   74f7                 | je                  0xfffffff9

        $sequence_10 = { 5f 5d c20c00 60 }
            // n = 4, score = 100
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   60                   | pushal              

        $sequence_11 = { 54 6a04 51 57 ff550c }
            // n = 5, score = 100
            //   54                   | push                esp
            //   6a04                 | push                4
            //   51                   | push                ecx
            //   57                   | push                edi
            //   ff550c               | call                dword ptr [ebp + 0xc]

        $sequence_12 = { 53 ff5534 8b4c241c 8bc1 }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   ff5534               | call                dword ptr [ebp + 0x34]
            //   8b4c241c             | mov                 ecx, dword ptr [esp + 0x1c]
            //   8bc1                 | mov                 eax, ecx

        $sequence_13 = { e2ee 59 8d442404 51 52 50 ff30 }
            // n = 7, score = 100
            //   e2ee                 | loop                0xfffffff0
            //   59                   | pop                 ecx
            //   8d442404             | lea                 eax, [esp + 4]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   50                   | push                eax
            //   ff30                 | push                dword ptr [eax]

        $sequence_14 = { 03403c 8b80c0000000 85c0 740c }
            // n = 4, score = 100
            //   03403c               | add                 eax, dword ptr [eax + 0x3c]
            //   8b80c0000000         | mov                 eax, dword ptr [eax + 0xc0]
            //   85c0                 | test                eax, eax
            //   740c                 | je                  0xe

        $sequence_15 = { ff30 6800100000 57 83e804 50 ff30 }
            // n = 6, score = 100
            //   ff30                 | push                dword ptr [eax]
            //   6800100000           | push                0x1000
            //   57                   | push                edi
            //   83e804               | sub                 eax, 4
            //   50                   | push                eax
            //   ff30                 | push                dword ptr [eax]

    condition:
        7 of them and filesize < 155648
}