rule win_zupdax_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 46 8a1c06 881c01 881406 0fb61c01 0fb6d2 }
            // n = 6, 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]
            //   0fb6d2               | movzx               edx, dl

        $sequence_1 = { 895e0c 8b5f10 895e10 894704 894f08 8b4f14 }
            // n = 6, score = 300
            //   895e0c               | mov                 dword ptr [esi + 0xc], ebx
            //   8b5f10               | mov                 ebx, dword ptr [edi + 0x10]
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   894f08               | mov                 dword ptr [edi + 8], ecx
            //   8b4f14               | mov                 ecx, dword ptr [edi + 0x14]

        $sequence_2 = { e8???????? 83c408 8b4618 50 895e24 895e28 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b4618               | mov                 eax, dword ptr [esi + 0x18]
            //   50                   | push                eax
            //   895e24               | mov                 dword ptr [esi + 0x24], ebx
            //   895e28               | mov                 dword ptr [esi + 0x28], ebx

        $sequence_3 = { 6a00 51 e8???????? 83c418 8bc6 c3 }
            // n = 6, score = 300
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   8bc6                 | mov                 eax, esi
            //   c3                   | ret                 

        $sequence_4 = { 8b4c2408 8b7e28 51 e8???????? 8b5624 }
            // n = 5, score = 300
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   8b7e28               | mov                 edi, dword ptr [esi + 0x28]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b5624               | mov                 edx, dword ptr [esi + 0x24]

        $sequence_5 = { 8d4e7c 6a00 51 e8???????? 83c418 8bc6 c3 }
            // n = 7, score = 300
            //   8d4e7c               | lea                 ecx, [esi + 0x7c]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   8bc6                 | mov                 eax, esi
            //   c3                   | ret                 

        $sequence_6 = { 4e 81ce00ffffff 46 8a1c06 881c01 }
            // n = 5, score = 300
            //   4e                   | dec                 esi
            //   81ce00ffffff         | or                  esi, 0xffffff00
            //   46                   | inc                 esi
            //   8a1c06               | mov                 bl, byte ptr [esi + eax]
            //   881c01               | mov                 byte ptr [ecx + eax], bl

        $sequence_7 = { 895e2c e8???????? 8b460c 83c404 3bc3 }
            // n = 5, score = 300
            //   895e2c               | mov                 dword ptr [esi + 0x2c], ebx
            //   e8????????           |                     
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   83c404               | add                 esp, 4
            //   3bc3                 | cmp                 eax, ebx

        $sequence_8 = { 8b460c 83c404 3bc3 7419 }
            // n = 4, score = 300
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   83c404               | add                 esp, 4
            //   3bc3                 | cmp                 eax, ebx
            //   7419                 | je                  0x1b

        $sequence_9 = { c706ffffffff c74604ffffffff e8???????? 68c8000000 }
            // n = 4, score = 300
            //   c706ffffffff         | mov                 dword ptr [esi], 0xffffffff
            //   c74604ffffffff       | mov                 dword ptr [esi + 4], 0xffffffff
            //   e8????????           |                     
            //   68c8000000           | push                0xc8

    condition:
        7 of them and filesize < 1032192
}