rule win_void_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.void."
        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.void"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 68???????? 50 8d4d30 c745fc03000000 e8???????? 68???????? 8d4530 }
            // n = 7, score = 200
            //   68????????           |                     
            //   50                   | push                eax
            //   8d4d30               | lea                 ecx, [ebp + 0x30]
            //   c745fc03000000       | mov                 dword ptr [ebp - 4], 3
            //   e8????????           |                     
            //   68????????           |                     
            //   8d4530               | lea                 eax, [ebp + 0x30]

        $sequence_1 = { 747e 6a01 8d8d64ffffff e8???????? 8d47a0 c745fc0f000000 50 }
            // n = 7, score = 200
            //   747e                 | je                  0x80
            //   6a01                 | push                1
            //   8d8d64ffffff         | lea                 ecx, [ebp - 0x9c]
            //   e8????????           |                     
            //   8d47a0               | lea                 eax, [edi - 0x60]
            //   c745fc0f000000       | mov                 dword ptr [ebp - 4], 0xf
            //   50                   | push                eax

        $sequence_2 = { 6a01 8d4ddc 895d68 e8???????? 8b5d64 8bc7 83c80c }
            // n = 7, score = 200
            //   6a01                 | push                1
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   895d68               | mov                 dword ptr [ebp + 0x68], ebx
            //   e8????????           |                     
            //   8b5d64               | mov                 ebx, dword ptr [ebp + 0x64]
            //   8bc7                 | mov                 eax, edi
            //   83c80c               | or                  eax, 0xc

        $sequence_3 = { 83c40c 8d8d34ffffff 57 e8???????? 8b55ec 83fa10 7228 }
            // n = 7, score = 200
            //   83c40c               | add                 esp, 0xc
            //   8d8d34ffffff         | lea                 ecx, [ebp - 0xcc]
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   83fa10               | cmp                 edx, 0x10
            //   7228                 | jb                  0x2a

        $sequence_4 = { 83c404 c645fc09 8d4ddc ff751c e8???????? 83e3df 895d6c }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   c645fc09             | mov                 byte ptr [ebp - 4], 9
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   e8????????           |                     
            //   83e3df               | and                 ebx, 0xffffffdf
            //   895d6c               | mov                 dword ptr [ebp + 0x6c], ebx

        $sequence_5 = { 50 ff75e8 8d45bc c645fc0c 50 ff5214 8bf0 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   c645fc0c             | mov                 byte ptr [ebp - 4], 0xc
            //   50                   | push                eax
            //   ff5214               | call                dword ptr [edx + 0x14]
            //   8bf0                 | mov                 esi, eax

        $sequence_6 = { 56 e8???????? 8b74242c 83c40c 8b7c242c 8d460c 50 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   83c40c               | add                 esp, 0xc
            //   8b7c242c             | mov                 edi, dword ptr [esp + 0x2c]
            //   8d460c               | lea                 eax, [esi + 0xc]
            //   50                   | push                eax

        $sequence_7 = { 0f8c0affffff e9???????? 803d????????00 0f8599000000 33c0 bfc2010000 66a3???????? }
            // n = 7, score = 200
            //   0f8c0affffff         | jl                  0xffffff10
            //   e9????????           |                     
            //   803d????????00       |                     
            //   0f8599000000         | jne                 0x9f
            //   33c0                 | xor                 eax, eax
            //   bfc2010000           | mov                 edi, 0x1c2
            //   66a3????????         |                     

    condition:
        7 of them and filesize < 2744320
}