rule win_quantloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.quantloader"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { e8???????? 83ec04 c785d4f7ffff00000000 e9???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   c785d4f7ffff00000000     | mov    dword ptr [ebp - 0x82c], 0
            //   e9????????           |                     

        $sequence_1 = { 83f801 7511 8d85f8fdffff 890424 e8???????? 83ec04 }
            // n = 6, score = 500
            //   83f801               | cmp                 eax, 1
            //   7511                 | jne                 0x13
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4

        $sequence_2 = { c745d401000000 c745bc40000000 8d45b8 890424 e8???????? 83ec04 85c0 }
            // n = 7, score = 500
            //   c745d401000000       | mov                 dword ptr [ebp - 0x2c], 1
            //   c745bc40000000       | mov                 dword ptr [ebp - 0x44], 0x40
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_3 = { 0fb69241504000 0fb601 28d0 8803 8d45f0 ff00 }
            // n = 6, score = 500
            //   0fb69241504000       | movzx               edx, byte ptr [edx + 0x405041]
            //   0fb601               | movzx               eax, byte ptr [ecx]
            //   28d0                 | sub                 al, dl
            //   8803                 | mov                 byte ptr [ebx], al
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   ff00                 | inc                 dword ptr [eax]

        $sequence_4 = { c70424???????? e8???????? 8b450c 89442404 c70424???????? e8???????? c7442404???????? }
            // n = 7, score = 500
            //   c70424????????       |                     
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   c70424????????       |                     
            //   e8????????           |                     
            //   c7442404????????     |                     

        $sequence_5 = { c70424???????? e8???????? 8d45f8 ff00 e9???????? c744240808000000 }
            // n = 6, score = 500
            //   c70424????????       |                     
            //   e8????????           |                     
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   ff00                 | inc                 dword ptr [eax]
            //   e9????????           |                     
            //   c744240808000000     | mov                 dword ptr [esp + 8], 8

        $sequence_6 = { 83ec24 8b4510 8845fb c70424???????? e8???????? }
            // n = 5, score = 500
            //   83ec24               | sub                 esp, 0x24
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8845fb               | mov                 byte ptr [ebp - 5], al
            //   c70424????????       |                     
            //   e8????????           |                     

        $sequence_7 = { e8???????? c7442408???????? c7442404???????? c7042402000080 e8???????? }
            // n = 5, score = 500
            //   e8????????           |                     
            //   c7442408????????     |                     
            //   c7442404????????     |                     
            //   c7042402000080       | mov                 dword ptr [esp], 0x80000002
            //   e8????????           |                     

        $sequence_8 = { ff550c 56 8b06 85c0 }
            // n = 4, score = 100
            //   ff550c               | call                dword ptr [ebp + 0xc]
            //   56                   | push                esi
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax

        $sequence_9 = { 53 ff5518 81c424020000 8974241c 61 c3 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   ff5518               | call                dword ptr [ebp + 0x18]
            //   81c424020000         | add                 esp, 0x224
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   61                   | popal               
            //   c3                   | ret                 

        $sequence_10 = { 58 85c9 7581 61 c3 }
            // n = 5, score = 100
            //   58                   | pop                 eax
            //   85c9                 | test                ecx, ecx
            //   7581                 | jne                 0xffffff83
            //   61                   | popal               
            //   c3                   | ret                 

        $sequence_11 = { 85c9 7413 ad 50 83e807 }
            // n = 5, score = 100
            //   85c9                 | test                ecx, ecx
            //   7413                 | je                  0x15
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   50                   | push                eax
            //   83e807               | sub                 eax, 7

        $sequence_12 = { 81ec20020000 b824020000 50 33f6 6a00 6a08 ff551c }
            // n = 7, score = 100
            //   81ec20020000         | sub                 esp, 0x220
            //   b824020000           | mov                 eax, 0x224
            //   50                   | push                eax
            //   33f6                 | xor                 esi, esi
            //   6a00                 | push                0
            //   6a08                 | push                8
            //   ff551c               | call                dword ptr [ebp + 0x1c]

        $sequence_13 = { 8d442404 51 52 50 }
            // n = 4, score = 100
            //   8d442404             | lea                 eax, [esp + 4]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_14 = { 5e 58 59 54 50 }
            // n = 5, score = 100
            //   5e                   | pop                 esi
            //   58                   | pop                 eax
            //   59                   | pop                 ecx
            //   54                   | push                esp
            //   50                   | push                eax

        $sequence_15 = { 6633d0 7409 81ee01100000 4e ebec 8d5efe 84ff }
            // n = 7, score = 100
            //   6633d0               | xor                 dx, ax
            //   7409                 | je                  0xb
            //   81ee01100000         | sub                 esi, 0x1001
            //   4e                   | dec                 esi
            //   ebec                 | jmp                 0xffffffee
            //   8d5efe               | lea                 ebx, [esi - 2]
            //   84ff                 | test                bh, bh

    condition:
        7 of them and filesize < 155648
}