rule win_isspace_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-29"
        version = "1"
        description = "Detects win.isspace."
        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.isspace"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 6a00 6a1c eb0a 6a00 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   6a1c                 | push                0x1c
            //   eb0a                 | jmp                 0xc
            //   6a00                 | push                0

        $sequence_1 = { 6a03 6a02 ff15???????? 894604 }
            // n = 4, score = 200
            //   6a03                 | push                3
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   894604               | mov                 dword ptr [esi + 4], eax

        $sequence_2 = { 6870170000 ff15???????? e9???????? 6a40 6a00 }
            // n = 5, score = 200
            //   6870170000           | push                0x1770
            //   ff15????????         |                     
            //   e9????????           |                     
            //   6a40                 | push                0x40
            //   6a00                 | push                0

        $sequence_3 = { c78548ffffff9c000000 e8???????? 8ad8 c745fc00000000 8d8548ffffff }
            // n = 5, score = 200
            //   c78548ffffff9c000000     | mov    dword ptr [ebp - 0xb8], 0x9c
            //   e8????????           |                     
            //   8ad8                 | mov                 bl, al
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8d8548ffffff         | lea                 eax, [ebp - 0xb8]

        $sequence_4 = { b898a30000 e8???????? a1???????? 3145f8 33c5 8945e4 53 }
            // n = 7, score = 200
            //   b898a30000           | mov                 eax, 0xa398
            //   e8????????           |                     
            //   a1????????           |                     
            //   3145f8               | xor                 dword ptr [ebp - 8], eax
            //   33c5                 | xor                 eax, ebp
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   53                   | push                ebx

        $sequence_5 = { 6800200300 a3???????? e8???????? 6800200300 a3???????? }
            // n = 5, score = 200
            //   6800200300           | push                0x32000
            //   a3????????           |                     
            //   e8????????           |                     
            //   6800200300           | push                0x32000
            //   a3????????           |                     

        $sequence_6 = { 0570010000 50 56 ff15???????? 56 ff15???????? }
            // n = 6, score = 200
            //   0570010000           | add                 eax, 0x170
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_7 = { c3 6a00 6a2b 68???????? }
            // n = 4, score = 200
            //   c3                   | ret                 
            //   6a00                 | push                0
            //   6a2b                 | push                0x2b
            //   68????????           |                     

    condition:
        7 of them and filesize < 434176
}