rule win_quantloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        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 = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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???????? 89442404 c70424???????? e8???????? 807dff00 751e c70424???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   c70424????????       |                     
            //   e8????????           |                     
            //   807dff00             | cmp                 byte ptr [ebp - 1], 0
            //   751e                 | jne                 0x20
            //   c70424????????       |                     

        $sequence_1 = { 890424 e8???????? 0fb6c0 83f801 7511 }
            // n = 5, score = 500
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   0fb6c0               | movzx               eax, al
            //   83f801               | cmp                 eax, 1
            //   7511                 | jne                 0x13

        $sequence_2 = { 55 89e5 81ec58080000 c745f400000000 c745f000000000 c745ec00000000 }
            // n = 6, score = 500
            //   55                   | push                ebp
            //   89e5                 | mov                 ebp, esp
            //   81ec58080000         | sub                 esp, 0x858
            //   c745f400000000       | mov                 dword ptr [ebp - 0xc], 0
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0

        $sequence_3 = { 8b4df0 01c1 8b55f0 8d45f4 8945e8 }
            // n = 5, score = 500
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   01c1                 | add                 ecx, eax
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax

        $sequence_4 = { 89442404 8b45ec 890424 e8???????? 83ec14 }
            // n = 5, score = 500
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec14               | sub                 esp, 0x14

        $sequence_5 = { 837decff 752b 8b45f0 890424 e8???????? 83ec04 8b45f4 }
            // n = 7, score = 500
            //   837decff             | cmp                 dword ptr [ebp - 0x14], -1
            //   752b                 | jne                 0x2d
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_6 = { 891424 e8???????? 85c0 7516 }
            // n = 4, score = 500
            //   891424               | mov                 dword ptr [esp], edx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7516                 | jne                 0x18

        $sequence_7 = { 890424 e8???????? c70424???????? e8???????? 89442404 8d85f8fdffff }
            // n = 6, score = 500
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   c70424????????       |                     
            //   e8????????           |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]

        $sequence_8 = { ad 50 83e807 35ac324195 2bc2 5a ab }
            // n = 7, score = 100
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   50                   | push                eax
            //   83e807               | sub                 eax, 7
            //   35ac324195           | xor                 eax, 0x954132ac
            //   2bc2                 | sub                 eax, edx
            //   5a                   | pop                 edx
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_9 = { 57 ff5500 50 56 8b7610 03f3 8bfe }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ff5500               | call                dword ptr [ebp]
            //   50                   | push                eax
            //   56                   | push                esi
            //   8b7610               | mov                 esi, dword ptr [esi + 0x10]
            //   03f3                 | add                 esi, ebx
            //   8bfe                 | mov                 edi, esi

        $sequence_10 = { ab 83e903 e2db 61 c3 6633f6 }
            // n = 6, score = 100
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   83e903               | sub                 ecx, 3
            //   e2db                 | loop                0xffffffdd
            //   61                   | popal               
            //   c3                   | ret                 
            //   6633f6               | xor                 si, si

        $sequence_11 = { 011407 e2ee 59 8d442404 }
            // n = 4, score = 100
            //   011407               | add                 dword ptr [edi + eax], edx
            //   e2ee                 | loop                0xfffffff0
            //   59                   | pop                 ecx
            //   8d442404             | lea                 eax, [esp + 4]

        $sequence_12 = { 66ad 6633d0 7409 81ee01100000 4e ebec 8d5efe }
            // n = 7, score = 100
            //   66ad                 | lodsw               ax, word ptr [esi]
            //   6633d0               | xor                 dx, ax
            //   7409                 | je                  0xb
            //   81ee01100000         | sub                 esi, 0x1001
            //   4e                   | dec                 esi
            //   ebec                 | jmp                 0xffffffee
            //   8d5efe               | lea                 ebx, [esi - 2]

        $sequence_13 = { c3 58 ffd0 837c240802 7414 }
            // n = 5, score = 100
            //   c3                   | ret                 
            //   58                   | pop                 eax
            //   ffd0                 | call                eax
            //   837c240802           | cmp                 dword ptr [esp + 8], 2
            //   7414                 | je                  0x16

        $sequence_14 = { 8bd8 8b7554 8b4558 50 50 }
            // n = 5, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   8b7554               | mov                 esi, dword ptr [ebp + 0x54]
            //   8b4558               | mov                 eax, dword ptr [ebp + 0x58]
            //   50                   | push                eax
            //   50                   | push                eax

        $sequence_15 = { 8900 e8???????? 58 ff6050 }
            // n = 4, score = 100
            //   8900                 | mov                 dword ptr [eax], eax
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   ff6050               | jmp                 dword ptr [eax + 0x50]

    condition:
        7 of them and filesize < 155648
}