rule win_gpcode_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.gpcode."
        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.gpcode"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { ff35???????? e8???????? e8???????? c705????????01000000 c3 55 8bec }
            // n = 7, score = 1400
            //   ff35????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   c705????????01000000     |     
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_1 = { ff35???????? e8???????? a1???????? a3???????? 6800001000 68???????? }
            // n = 6, score = 1400
            //   ff35????????         |                     
            //   e8????????           |                     
            //   a1????????           |                     
            //   a3????????           |                     
            //   6800001000           | push                0x100000
            //   68????????           |                     

        $sequence_2 = { ff35???????? e8???????? e8???????? c705????????01000000 c3 55 }
            // n = 6, score = 1400
            //   ff35????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   c705????????01000000     |     
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_3 = { ff35???????? e8???????? e8???????? c705????????01000000 c3 }
            // n = 5, score = 1400
            //   ff35????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   c705????????01000000     |     
            //   c3                   | ret                 

        $sequence_4 = { 68???????? e8???????? 91 6a00 }
            // n = 4, score = 1400
            //   68????????           |                     
            //   e8????????           |                     
            //   91                   | xchg                eax, ecx
            //   6a00                 | push                0

        $sequence_5 = { ff35???????? ff35???????? ff35???????? e8???????? a1???????? a3???????? 6800001000 }
            // n = 7, score = 1400
            //   ff35????????         |                     
            //   ff35????????         |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   a1????????           |                     
            //   a3????????           |                     
            //   6800001000           | push                0x100000

        $sequence_6 = { a1???????? a3???????? 6800001000 68???????? ff35???????? 6a00 }
            // n = 6, score = 1400
            //   a1????????           |                     
            //   a3????????           |                     
            //   6800001000           | push                0x100000
            //   68????????           |                     
            //   ff35????????         |                     
            //   6a00                 | push                0

        $sequence_7 = { e8???????? a1???????? a3???????? 6800001000 68???????? }
            // n = 5, score = 1400
            //   e8????????           |                     
            //   a1????????           |                     
            //   a3????????           |                     
            //   6800001000           | push                0x100000
            //   68????????           |                     

        $sequence_8 = { e8???????? a1???????? a3???????? 6800001000 68???????? ff35???????? 6a00 }
            // n = 7, score = 1400
            //   e8????????           |                     
            //   a1????????           |                     
            //   a3????????           |                     
            //   6800001000           | push                0x100000
            //   68????????           |                     
            //   ff35????????         |                     
            //   6a00                 | push                0

        $sequence_9 = { c3 ff35???????? e8???????? e8???????? c705????????01000000 }
            // n = 5, score = 1400
            //   c3                   | ret                 
            //   ff35????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   c705????????01000000     |     

    condition:
        7 of them and filesize < 761856
}