rule win_zupdax_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.zupdax."
        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.zupdax"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 52 8d442416 50 6689542418 e8???????? 83c418 }
            // n = 6, score = 300
            //   52                   | push                edx
            //   8d442416             | lea                 eax, [esp + 0x16]
            //   50                   | push                eax
            //   6689542418           | mov                 word ptr [esp + 0x18], dx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_1 = { e8???????? 68c8000000 8d4e7c 6a00 51 e8???????? 83c418 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   68c8000000           | push                0xc8
            //   8d4e7c               | lea                 ecx, [esi + 0x7c]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_2 = { 394c2414 765b 53 41 81e1ff000080 }
            // n = 5, score = 300
            //   394c2414             | cmp                 dword ptr [esp + 0x14], ecx
            //   765b                 | jbe                 0x5d
            //   53                   | push                ebx
            //   41                   | inc                 ecx
            //   81e1ff000080         | and                 ecx, 0x800000ff

        $sequence_3 = { 51 8b4624 53 33db 57 }
            // n = 5, score = 300
            //   51                   | push                ecx
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   57                   | push                edi

        $sequence_4 = { 83c40c 6a00 8d4c2404 51 ff15???????? }
            // n = 5, score = 300
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0
            //   8d4c2404             | lea                 ecx, [esp + 4]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_5 = { 52 68???????? ff15???????? 8d442444 83c0fe 668b4802 83c002 }
            // n = 7, score = 300
            //   52                   | push                edx
            //   68????????           |                     
            //   ff15????????         |                     
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   83c0fe               | add                 eax, -2
            //   668b4802             | mov                 cx, word ptr [eax + 2]
            //   83c002               | add                 eax, 2

        $sequence_6 = { 46 8a1c06 881c01 881406 0fb61c01 }
            // n = 5, score = 300
            //   46                   | inc                 esi
            //   8a1c06               | mov                 bl, byte ptr [esi + eax]
            //   881c01               | mov                 byte ptr [ecx + eax], bl
            //   881406               | mov                 byte ptr [esi + eax], dl
            //   0fb61c01             | movzx               ebx, byte ptr [ecx + eax]

        $sequence_7 = { 3b7c2418 72a7 5b 5f 5e }
            // n = 5, score = 300
            //   3b7c2418             | cmp                 edi, dword ptr [esp + 0x18]
            //   72a7                 | jb                  0xffffffa9
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_8 = { 8a1c06 881c01 881406 0fb61c01 0fb6d2 03da 81e3ff000080 }
            // n = 7, score = 300
            //   8a1c06               | mov                 bl, byte ptr [esi + eax]
            //   881c01               | mov                 byte ptr [ecx + eax], bl
            //   881406               | mov                 byte ptr [esi + eax], dl
            //   0fb61c01             | movzx               ebx, byte ptr [ecx + eax]
            //   0fb6d2               | movzx               edx, dl
            //   03da                 | add                 ebx, edx
            //   81e3ff000080         | and                 ebx, 0x800000ff

        $sequence_9 = { 8b4624 53 33db 57 3bc3 7419 }
            // n = 6, score = 300
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   57                   | push                edi
            //   3bc3                 | cmp                 eax, ebx
            //   7419                 | je                  0x1b

    condition:
        7 of them and filesize < 1032192
}