rule win_mpkbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.mpkbot."
        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.mpkbot"
        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 = { 38450c 740a eb05 38450c 7503 }
            // n = 5, score = 400
            //   38450c               | cmp                 byte ptr [ebp + 0xc], al
            //   740a                 | je                  0xc
            //   eb05                 | jmp                 7
            //   38450c               | cmp                 byte ptr [ebp + 0xc], al
            //   7503                 | jne                 5

        $sequence_1 = { 8b45f8 8d55ec 52 8d55fc 52 6a01 6aff }
            // n = 7, score = 400
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   52                   | push                edx
            //   8d55fc               | lea                 edx, [ebp - 4]
            //   52                   | push                edx
            //   6a01                 | push                1
            //   6aff                 | push                -1

        $sequence_2 = { a3???????? 8d45fc 50 683f000f00 6a00 }
            // n = 5, score = 400
            //   a3????????           |                     
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   683f000f00           | push                0xf003f
            //   6a00                 | push                0

        $sequence_3 = { 85c0 7fdf 5e 5b c9 c3 }
            // n = 6, score = 400
            //   85c0                 | test                eax, eax
            //   7fdf                 | jg                  0xffffffe1
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c3                   | ret                 

        $sequence_4 = { 50 ff15???????? a3???????? ffe0 55 8bec 68???????? }
            // n = 7, score = 400
            //   50                   | push                eax
            //   ff15????????         |                     
            //   a3????????           |                     
            //   ffe0                 | jmp                 eax
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   68????????           |                     

        $sequence_5 = { 6a01 ff15???????? ebcc 55 8bec }
            // n = 5, score = 400
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   ebcc                 | jmp                 0xffffffce
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_6 = { 56 57 6a00 ff15???????? 8bf0 0fb7450c }
            // n = 6, score = 400
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   0fb7450c             | movzx               eax, word ptr [ebp + 0xc]

        $sequence_7 = { 6800010000 56 e8???????? 46 }
            // n = 4, score = 400
            //   6800010000           | push                0x100
            //   56                   | push                esi
            //   e8????????           |                     
            //   46                   | inc                 esi

        $sequence_8 = { 6a20 68???????? 68???????? 8975f8 8b08 50 ff5150 }
            // n = 7, score = 400
            //   6a20                 | push                0x20
            //   68????????           |                     
            //   68????????           |                     
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   50                   | push                eax
            //   ff5150               | call                dword ptr [ecx + 0x50]

        $sequence_9 = { 8b3d???????? 43 68???????? 895e08 ffd7 6a00 }
            // n = 6, score = 400
            //   8b3d????????         |                     
            //   43                   | inc                 ebx
            //   68????????           |                     
            //   895e08               | mov                 dword ptr [esi + 8], ebx
            //   ffd7                 | call                edi
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 139264
}