rule win_mpkbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8bd1 6689500c 6a18 5a }
            // n = 4, score = 400
            //   8bd1                 | mov                 edx, ecx
            //   6689500c             | mov                 word ptr [eax + 0xc], dx
            //   6a18                 | push                0x18
            //   5a                   | pop                 edx

        $sequence_1 = { ff15???????? 68???????? 50 ff15???????? ff7508 a3???????? }
            // n = 6, score = 400
            //   ff15????????         |                     
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   a3????????           |                     

        $sequence_2 = { ff15???????? 8b45fc 3bc6 7406 }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   3bc6                 | cmp                 eax, esi
            //   7406                 | je                  8

        $sequence_3 = { 53 ffd6 85c0 750a 6a01 ff15???????? }
            // n = 6, score = 400
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   6a01                 | push                1
            //   ff15????????         |                     

        $sequence_4 = { 740c 68???????? 53 ffd6 85c0 750a 6a01 }
            // n = 7, score = 400
            //   740c                 | je                  0xe
            //   68????????           |                     
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   6a01                 | push                1

        $sequence_5 = { ffd6 50 ffd7 40 }
            // n = 4, score = 400
            //   ffd6                 | call                esi
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   40                   | inc                 eax

        $sequence_6 = { ff15???????? ebcc 55 8bec }
            // n = 4, score = 400
            //   ff15????????         |                     
            //   ebcc                 | jmp                 0xffffffce
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_7 = { 56 ff15???????? b90180ffff 663bc1 750d 6a00 6800010000 }
            // n = 7, score = 400
            //   56                   | push                esi
            //   ff15????????         |                     
            //   b90180ffff           | mov                 ecx, 0xffff8001
            //   663bc1               | cmp                 ax, cx
            //   750d                 | jne                 0xf
            //   6a00                 | push                0
            //   6800010000           | push                0x100

        $sequence_8 = { 33c0 384508 7507 38450c 740a eb05 }
            // n = 6, score = 400
            //   33c0                 | xor                 eax, eax
            //   384508               | cmp                 byte ptr [ebp + 8], al
            //   7507                 | jne                 9
            //   38450c               | cmp                 byte ptr [ebp + 0xc], al
            //   740a                 | je                  0xc
            //   eb05                 | jmp                 7

        $sequence_9 = { 68???????? ff15???????? 68???????? 50 ff15???????? ff750c a3???????? }
            // n = 7, score = 400
            //   68????????           |                     
            //   ff15????????         |                     
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   a3????????           |                     

    condition:
        7 of them and filesize < 139264
}