rule win_datper_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8d85ecf3ffff 50 e8???????? 68???????? 8d85ecfbffff 50 e8???????? }
            // n = 7, score = 200
            //   8d85ecf3ffff         | lea                 eax, dword ptr [ebp - 0xc14]
            //   50                   | push                eax
            //   e8????????           |                     
            //   68????????           |                     
            //   8d85ecfbffff         | lea                 eax, dword ptr [ebp - 0x414]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_1 = { 0fb77c6efe 83ef30 837c240c00 7509 837c240800 7249 eb02 }
            // n = 7, score = 200
            //   0fb77c6efe           | movzx               edi, word ptr [esi + ebp*2 - 2]
            //   83ef30               | sub                 edi, 0x30
            //   837c240c00           | cmp                 dword ptr [esp + 0xc], 0
            //   7509                 | jne                 0xb
            //   837c240800           | cmp                 dword ptr [esp + 8], 0
            //   7249                 | jb                  0x4b
            //   eb02                 | jmp                 4

        $sequence_2 = { 56 8b45f4 50 a1???????? 8b00 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   50                   | push                eax
            //   a1????????           |                     
            //   8b00                 | mov                 eax, dword ptr [eax]

        $sequence_3 = { 81c4f0fbffff 53 56 57 8955fc 8bf0 33c0 }
            // n = 7, score = 200
            //   81c4f0fbffff         | add                 esp, 0xfffffbf0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   8bf0                 | mov                 esi, eax
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 83c010 50 8b45ec e8???????? 50 e8???????? 8b45ec }
            // n = 7, score = 200
            //   83c010               | add                 eax, 0x10
            //   50                   | push                eax
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   e8????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

        $sequence_5 = { c7432010314000 8bc6 5a 5f }
            // n = 4, score = 200
            //   c7432010314000       | mov                 dword ptr [ebx + 0x20], 0x403110
            //   8bc6                 | mov                 eax, esi
            //   5a                   | pop                 edx
            //   5f                   | pop                 edi

        $sequence_6 = { c78568d7ffff0c000000 33c0 89856cd7ffff c78570d7ffffffffffff 6a00 6a01 8d8568d7ffff }
            // n = 7, score = 200
            //   c78568d7ffff0c000000     | mov    dword ptr [ebp - 0x2898], 0xc
            //   33c0                 | xor                 eax, eax
            //   89856cd7ffff         | mov                 dword ptr [ebp - 0x2894], eax
            //   c78570d7ffffffffffff     | mov    dword ptr [ebp - 0x2890], 0xffffffff
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   8d8568d7ffff         | lea                 eax, dword ptr [ebp - 0x2898]

        $sequence_7 = { ba02000000 e8???????? 8d45ec ba05000000 e8???????? }
            // n = 5, score = 200
            //   ba02000000           | mov                 edx, 2
            //   e8????????           |                     
            //   8d45ec               | lea                 eax, dword ptr [ebp - 0x14]
            //   ba05000000           | mov                 edx, 5
            //   e8????????           |                     

        $sequence_8 = { e8???????? 6800001000 6a40 e8???????? 8bf0 8b45e0 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   6800001000           | push                0x100000
            //   6a40                 | push                0x40
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]

        $sequence_9 = { e8???????? 8b55cc b901000000 b8???????? e8???????? 8bd8 85db }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b55cc               | mov                 edx, dword ptr [ebp - 0x34]
            //   b901000000           | mov                 ecx, 1
            //   b8????????           |                     
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx

    condition:
        7 of them and filesize < 253952
}