rule win_zupdax_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b4c2408 8b7e28 51 e8???????? 8b5624 52 e8???????? }
            // n = 7, 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]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_1 = { 30142f 47 3b7c2418 72a7 5b 5f 5e }
            // n = 7, score = 300
            //   30142f               | xor                 byte ptr [edi + ebp], dl
            //   47                   | inc                 edi
            //   3b7c2418             | cmp                 edi, dword ptr [esp + 0x18]
            //   72a7                 | jb                  0xffffffa9
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_2 = { 83e902 f7d9 1bc9 83e10c }
            // n = 4, score = 300
            //   83e902               | sub                 ecx, 2
            //   f7d9                 | neg                 ecx
            //   1bc9                 | sbb                 ecx, ecx
            //   83e10c               | and                 ecx, 0xc

        $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 = { 8d542448 52 68???????? ff15???????? 8d442444 83c0fe 668b4802 }
            // n = 7, score = 300
            //   8d542448             | lea                 edx, [esp + 0x48]
            //   52                   | push                edx
            //   68????????           |                     
            //   ff15????????         |                     
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   83c0fe               | add                 eax, -2
            //   668b4802             | mov                 cx, word ptr [eax + 2]

        $sequence_5 = { 68???????? ff15???????? 8d442444 83c0fe 668b4802 83c002 }
            // n = 6, score = 300
            //   68????????           |                     
            //   ff15????????         |                     
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   83c0fe               | add                 eax, -2
            //   668b4802             | mov                 cx, word ptr [eax + 2]
            //   83c002               | add                 eax, 2

        $sequence_6 = { 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_7 = { c74604ffffffff e8???????? 68c8000000 8d4e7c }
            // n = 4, score = 300
            //   c74604ffffffff       | mov                 dword ptr [esi + 4], 0xffffffff
            //   e8????????           |                     
            //   68c8000000           | push                0xc8
            //   8d4e7c               | lea                 ecx, [esi + 0x7c]

        $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 = { 8b15???????? a1???????? 668b0d???????? 68f6000000 }
            // n = 4, score = 300
            //   8b15????????         |                     
            //   a1????????           |                     
            //   668b0d????????       |                     
            //   68f6000000           | push                0xf6

    condition:
        7 of them and filesize < 1032192
}