rule win_datper_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.datper."
        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.datper"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 741d 66ffc8 742b e9???????? b800000080 ba03000000 c7431cd0304000 }
            // n = 7, score = 200
            //   741d                 | je                  0x1f
            //   66ffc8               | dec                 ax
            //   742b                 | je                  0x2d
            //   e9????????           |                     
            //   b800000080           | mov                 eax, 0x80000000
            //   ba03000000           | mov                 edx, 3
            //   c7431cd0304000       | mov                 dword ptr [ebx + 0x1c], 0x4030d0

        $sequence_1 = { 8b03 e8???????? 8b55dc b8???????? e8???????? 8d45f4 e8???????? }
            // n = 7, score = 200
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   e8????????           |                     
            //   8b55dc               | mov                 edx, dword ptr [ebp - 0x24]
            //   b8????????           |                     
            //   e8????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   e8????????           |                     

        $sequence_2 = { 8d8580feffff e8???????? c78588feffff02000000 33c0 89858cfeffff 8b55d0 8b45d4 }
            // n = 7, score = 200
            //   8d8580feffff         | lea                 eax, [ebp - 0x180]
            //   e8????????           |                     
            //   c78588feffff02000000     | mov    dword ptr [ebp - 0x178], 2
            //   33c0                 | xor                 eax, eax
            //   89858cfeffff         | mov                 dword ptr [ebp - 0x174], eax
            //   8b55d0               | mov                 edx, dword ptr [ebp - 0x30]
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]

        $sequence_3 = { 46 83fb03 75dd 0fb6442414 c1e802 88442417 0fb6442414 }
            // n = 7, score = 200
            //   46                   | inc                 esi
            //   83fb03               | cmp                 ebx, 3
            //   75dd                 | jne                 0xffffffdf
            //   0fb6442414           | movzx               eax, byte ptr [esp + 0x14]
            //   c1e802               | shr                 eax, 2
            //   88442417             | mov                 byte ptr [esp + 0x17], al
            //   0fb6442414           | movzx               eax, byte ptr [esp + 0x14]

        $sequence_4 = { 8bc3 b20d e8???????? 8bc3 b20a e8???????? }
            // n = 6, score = 200
            //   8bc3                 | mov                 eax, ebx
            //   b20d                 | mov                 dl, 0xd
            //   e8????????           |                     
            //   8bc3                 | mov                 eax, ebx
            //   b20a                 | mov                 dl, 0xa
            //   e8????????           |                     

        $sequence_5 = { 740c 8b03 50 e8???????? 85c0 7510 }
            // n = 6, score = 200
            //   740c                 | je                  0xe
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7510                 | jne                 0x12

        $sequence_6 = { e8???????? 8bf0 81fe03010000 7e0f b803000000 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   81fe03010000         | cmp                 esi, 0x103
            //   7e0f                 | jle                 0x11
            //   b803000000           | mov                 eax, 3

        $sequence_7 = { 50 53 e8???????? a3???????? 8d55e8 b8???????? }
            // n = 6, score = 200
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   a3????????           |                     
            //   8d55e8               | lea                 edx, [ebp - 0x18]
            //   b8????????           |                     

        $sequence_8 = { a1???????? e8???????? 50 a1???????? 0582000000 50 e8???????? }
            // n = 7, score = 200
            //   a1????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax
            //   a1????????           |                     
            //   0582000000           | add                 eax, 0x82
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_9 = { 6880000000 6a02 6a00 6a02 6800000040 8b45f4 e8???????? }
            // n = 7, score = 200
            //   6880000000           | push                0x80
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   6800000040           | push                0x40000000
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 253952
}