rule win_voidoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.voidoor."
        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.voidoor"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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???????? 83c40c 8b4710 c6040600 c7471480ad4200 c74718c0ad4200 c7471c60ad4200 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b4710               | mov                 eax, dword ptr [edi + 0x10]
            //   c6040600             | mov                 byte ptr [esi + eax], 0
            //   c7471480ad4200       | mov                 dword ptr [edi + 0x14], 0x42ad80
            //   c74718c0ad4200       | mov                 dword ptr [edi + 0x18], 0x42adc0
            //   c7471c60ad4200       | mov                 dword ptr [edi + 0x1c], 0x42ad60

        $sequence_1 = { 8b442404 57 8b7808 8b8770030000 8b4008 85c0 7431 }
            // n = 7, score = 100
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   57                   | push                edi
            //   8b7808               | mov                 edi, dword ptr [eax + 8]
            //   8b8770030000         | mov                 eax, dword ptr [edi + 0x370]
            //   8b4008               | mov                 eax, dword ptr [eax + 8]
            //   85c0                 | test                eax, eax
            //   7431                 | je                  0x33

        $sequence_2 = { 8d442448 50 ff760c 33db 6a00 85d2 8d442438 }
            // n = 7, score = 100
            //   8d442448             | lea                 eax, [esp + 0x48]
            //   50                   | push                eax
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   33db                 | xor                 ebx, ebx
            //   6a00                 | push                0
            //   85d2                 | test                edx, edx
            //   8d442438             | lea                 eax, [esp + 0x38]

        $sequence_3 = { eb07 a801 7418 53 6a20 ff542414 83c408 }
            // n = 7, score = 100
            //   eb07                 | jmp                 9
            //   a801                 | test                al, 1
            //   7418                 | je                  0x1a
            //   53                   | push                ebx
            //   6a20                 | push                0x20
            //   ff542414             | call                dword ptr [esp + 0x14]
            //   83c408               | add                 esp, 8

        $sequence_4 = { eb3a 8b5010 85d2 744d 8b7818 8b4014 b9???????? }
            // n = 7, score = 100
            //   eb3a                 | jmp                 0x3c
            //   8b5010               | mov                 edx, dword ptr [eax + 0x10]
            //   85d2                 | test                edx, edx
            //   744d                 | je                  0x4f
            //   8b7818               | mov                 edi, dword ptr [eax + 0x18]
            //   8b4014               | mov                 eax, dword ptr [eax + 0x14]
            //   b9????????           |                     

        $sequence_5 = { c70000000000 c7400400000000 c7400800000000 8b4608 ff4e0c 85c0 7407 }
            // n = 7, score = 100
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   c7400400000000       | mov                 dword ptr [eax + 4], 0
            //   c7400800000000       | mov                 dword ptr [eax + 8], 0
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   ff4e0c               | dec                 dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9

        $sequence_6 = { c645fc07 83bdacfaffff10 720e ffb598faffff e8???????? 83c404 83c718 }
            // n = 7, score = 100
            //   c645fc07             | mov                 byte ptr [ebp - 4], 7
            //   83bdacfaffff10       | cmp                 dword ptr [ebp - 0x554], 0x10
            //   720e                 | jb                  0x10
            //   ffb598faffff         | push                dword ptr [ebp - 0x568]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83c718               | add                 edi, 0x18

        $sequence_7 = { c705????????01000000 69c06d4ec641 0539300000 69c06d4ec641 0539300000 69c06d4ec641 0539300000 }
            // n = 7, score = 100
            //   c705????????01000000     |     
            //   69c06d4ec641         | imul                eax, eax, 0x41c64e6d
            //   0539300000           | add                 eax, 0x3039
            //   69c06d4ec641         | imul                eax, eax, 0x41c64e6d
            //   0539300000           | add                 eax, 0x3039
            //   69c06d4ec641         | imul                eax, eax, 0x41c64e6d
            //   0539300000           | add                 eax, 0x3039

        $sequence_8 = { 83c408 85c0 740e 99 6a09 52 50 }
            // n = 7, score = 100
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   99                   | cdq                 
            //   6a09                 | push                9
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_9 = { 837d1c10 57 6880000000 6a03 57 57 8d4508 }
            // n = 7, score = 100
            //   837d1c10             | cmp                 dword ptr [ebp + 0x1c], 0x10
            //   57                   | push                edi
            //   6880000000           | push                0x80
            //   6a03                 | push                3
            //   57                   | push                edi
            //   57                   | push                edi
            //   8d4508               | lea                 eax, [ebp + 8]

    condition:
        7 of them and filesize < 1744896
}