rule win_datper_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 85d2 7240 42 33ff 8d8350020000 80381a }
            // n = 6, score = 200
            //   85d2                 | test                edx, edx
            //   7240                 | jb                  0x42
            //   42                   | inc                 edx
            //   33ff                 | xor                 edi, edi
            //   8d8350020000         | lea                 eax, [ebx + 0x250]
            //   80381a               | cmp                 byte ptr [eax], 0x1a

        $sequence_1 = { ff4d90 7592 8b5db8 03db }
            // n = 4, score = 200
            //   ff4d90               | dec                 dword ptr [ebp - 0x70]
            //   7592                 | jne                 0xffffff94
            //   8b5db8               | mov                 ebx, dword ptr [ebp - 0x48]
            //   03db                 | add                 ebx, ebx

        $sequence_2 = { 7302 0c20 8801 41 46 4a 85d2 }
            // n = 7, score = 200
            //   7302                 | jae                 4
            //   0c20                 | or                  al, 0x20
            //   8801                 | mov                 byte ptr [ecx], al
            //   41                   | inc                 ecx
            //   46                   | inc                 esi
            //   4a                   | dec                 edx
            //   85d2                 | test                edx, edx

        $sequence_3 = { 33c0 8945ac 8d85dcefffff 50 8d852cf2ffff }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   8945ac               | mov                 dword ptr [ebp - 0x54], eax
            //   8d85dcefffff         | lea                 eax, [ebp - 0x1024]
            //   50                   | push                eax
            //   8d852cf2ffff         | lea                 eax, [ebp - 0xdd4]

        $sequence_4 = { c78588feffff07000000 6945ac50020000 83c004 89858cfeffff 8b55d4 8d8580feffff b910000000 }
            // n = 7, score = 200
            //   c78588feffff07000000     | mov    dword ptr [ebp - 0x178], 7
            //   6945ac50020000       | imul                eax, dword ptr [ebp - 0x54], 0x250
            //   83c004               | add                 eax, 4
            //   89858cfeffff         | mov                 dword ptr [ebp - 0x174], eax
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   8d8580feffff         | lea                 eax, [ebp - 0x180]
            //   b910000000           | mov                 ecx, 0x10

        $sequence_5 = { a3???????? 8d95bcfbffff b8???????? e8???????? 8b85bcfbffff e8???????? }
            // n = 6, score = 200
            //   a3????????           |                     
            //   8d95bcfbffff         | lea                 edx, [ebp - 0x444]
            //   b8????????           |                     
            //   e8????????           |                     
            //   8b85bcfbffff         | mov                 eax, dword ptr [ebp - 0x444]
            //   e8????????           |                     

        $sequence_6 = { 33c0 8945f8 8d45fc ba00280000 e8???????? 8b4508 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   ba00280000           | mov                 edx, 0x2800
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_7 = { b904000000 ba???????? 8b45fc e8???????? 8b9508faffff }
            // n = 5, score = 200
            //   b904000000           | mov                 ecx, 4
            //   ba????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   8b9508faffff         | mov                 edx, dword ptr [ebp - 0x5f8]

        $sequence_8 = { 7205 48 7410 eb15 8bc3 e8???????? }
            // n = 6, score = 200
            //   7205                 | jb                  7
            //   48                   | dec                 eax
            //   7410                 | je                  0x12
            //   eb15                 | jmp                 0x17
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     

        $sequence_9 = { 8d85ccfcffff 50 6a00 6a00 6a40 6a00 6a00 }
            // n = 7, score = 200
            //   8d85ccfcffff         | lea                 eax, [ebp - 0x334]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a40                 | push                0x40
            //   6a00                 | push                0
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 253952
}