rule win_datper_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.datper"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { b802000000 81c404f0ffff 50 48 75f6 8b45fc 81c468f7ffff }
            // n = 7, score = 200
            //   b802000000           | mov                 eax, 2
            //   81c404f0ffff         | add                 esp, 0xfffff004
            //   50                   | push                eax
            //   48                   | dec                 eax
            //   75f6                 | jne                 0xfffffff8
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   81c468f7ffff         | add                 esp, 0xfffff768

        $sequence_1 = { 8985bcd7ffff 8d8574d7ffff 50 8d8584d7ffff }
            // n = 4, score = 200
            //   8985bcd7ffff         | mov                 dword ptr [ebp - 0x2844], eax
            //   8d8574d7ffff         | lea                 eax, [ebp - 0x288c]
            //   50                   | push                eax
            //   8d8584d7ffff         | lea                 eax, [ebp - 0x287c]

        $sequence_2 = { 50 e8???????? 83c003 03c0 8b55d4 83c210 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c003               | add                 eax, 3
            //   03c0                 | add                 eax, eax
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   83c210               | add                 edx, 0x10

        $sequence_3 = { 83ee04 8b06 d1e8 8bf0 8d45e8 50 }
            // n = 6, score = 200
            //   83ee04               | sub                 esi, 4
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   d1e8                 | shr                 eax, 1
            //   8bf0                 | mov                 esi, eax
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax

        $sequence_4 = { 4b 3bd3 7507 03c1 8945f8 eb0a }
            // n = 6, score = 200
            //   4b                   | dec                 ebx
            //   3bd3                 | cmp                 edx, ebx
            //   7507                 | jne                 9
            //   03c1                 | add                 eax, ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   eb0a                 | jmp                 0xc

        $sequence_5 = { 8b55e4 8d45f4 e8???????? 43 8b45fc }
            // n = 5, score = 200
            //   8b55e4               | mov                 edx, dword ptr [ebp - 0x1c]
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   e8????????           |                     
            //   43                   | inc                 ebx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_6 = { 50 33c9 33d2 8b45f0 e8???????? 8945e0 837de000 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   33c9                 | xor                 ecx, ecx
            //   33d2                 | xor                 edx, edx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   837de000             | cmp                 dword ptr [ebp - 0x20], 0

        $sequence_7 = { 8b45f8 e8???????? 8945fc 8bd7 2b55fc }
            // n = 5, score = 200
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8bd7                 | mov                 edx, edi
            //   2b55fc               | sub                 edx, dword ptr [ebp - 4]

        $sequence_8 = { 8b4508 9b 8bc9 90 }
            // n = 4, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   9b                   | wait                
            //   8bc9                 | mov                 ecx, ecx
            //   90                   | nop                 

        $sequence_9 = { f7d0 f7d0 f7d2 f7d2 8bdb }
            // n = 5, score = 100
            //   f7d0                 | not                 eax
            //   f7d0                 | not                 eax
            //   f7d2                 | not                 edx
            //   f7d2                 | not                 edx
            //   8bdb                 | mov                 ebx, ebx

        $sequence_10 = { 8b842430f3ffff 9b 87e4 b301 }
            // n = 4, score = 100
            //   8b842430f3ffff       | mov                 eax, dword ptr [esp - 0xcd0]
            //   9b                   | wait                
            //   87e4                 | xchg                esp, esp
            //   b301                 | mov                 bl, 1

        $sequence_11 = { 7500 7500 90 8bff 5e f7d0 f7d0 }
            // n = 7, score = 100
            //   7500                 | jne                 2
            //   7500                 | jne                 2
            //   90                   | nop                 
            //   8bff                 | mov                 edi, edi
            //   5e                   | pop                 esi
            //   f7d0                 | not                 eax
            //   f7d0                 | not                 eax

        $sequence_12 = { c605????????02 c705????????743b4000 e8???????? 84c0 7405 e8???????? }
            // n = 6, score = 100
            //   c605????????02       |                     
            //   c705????????743b4000     |     
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7405                 | je                  7
            //   e8????????           |                     

        $sequence_13 = { 9b 93 899c2410f3ffff 8bd8 8b842410f3ffff 8d36 }
            // n = 6, score = 100
            //   9b                   | wait                
            //   93                   | xchg                eax, ebx
            //   899c2410f3ffff       | mov                 dword ptr [esp - 0xcf0], ebx
            //   8bd8                 | mov                 ebx, eax
            //   8b842410f3ffff       | mov                 eax, dword ptr [esp - 0xcf0]
            //   8d36                 | lea                 esi, [esi]

        $sequence_14 = { 8bc9 9b 812b0be3da3f 7500 }
            // n = 4, score = 100
            //   8bc9                 | mov                 ecx, ecx
            //   9b                   | wait                
            //   812b0be3da3f         | sub                 dword ptr [ebx], 0x3fdae30b
            //   7500                 | jne                 2

        $sequence_15 = { 8bd0 8b842420f1ffff f7d3 f7d3 }
            // n = 4, score = 100
            //   8bd0                 | mov                 edx, eax
            //   8b842420f1ffff       | mov                 eax, dword ptr [esp - 0xee0]
            //   f7d3                 | not                 ebx
            //   f7d3                 | not                 ebx

    condition:
        7 of them and filesize < 565248
}