rule win_holerun_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.holerun."
        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.holerun"
        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 = { 488b45f8 48f7d0 488905???????? 4883c440 5d }
            // n = 5, score = 100
            //   488b45f8             | mov                 ecx, eax
            //   48f7d0               | call                eax
            //   488905????????       |                     
            //   4883c440             | mov                 eax, dword ptr [ebp + 0x3cc]
            //   5d                   | dec                 eax

        $sequence_1 = { 4889c1 e8???????? eb07 c745fc01000000 }
            // n = 4, score = 100
            //   4889c1               | mov                 dword ptr [ebp - 0x38], eax
            //   e8????????           |                     
            //   eb07                 | jmp                 0x1e5
            //   c745fc01000000       | dec                 eax

        $sequence_2 = { 488b45e0 0fb74006 0fb7c0 3b45f4 77c7 b800000000 4883c440 }
            // n = 7, score = 100
            //   488b45e0             | dec                 eax
            //   0fb74006             | mov                 ecx, eax
            //   0fb7c0               | call                eax
            //   3b45f4               | dec                 eax
            //   77c7                 | mov                 dword ptr [ebp - 0x18], 0
            //   b800000000           | mov                 dword ptr [ebp - 0x34], 0x30
            //   4883c440             | mov                 eax, dword ptr [ebp - 0x34]

        $sequence_3 = { 4889c1 488b05???????? ffd0 488b45e0 483145f8 48b8ffffffffffff0000 482145f8 }
            // n = 7, score = 100
            //   4889c1               | dec                 ecx
            //   488b05????????       |                     
            //   ffd0                 | mov                 eax, edx
            //   488b45e0             | dec                 eax
            //   483145f8             | lea                 edx, [0x3cbc]
            //   48b8ffffffffffff0000     | dec    eax
            //   482145f8             | mov                 ecx, eax

        $sequence_4 = { 4889e5 4883ec40 48894d10 c745fc00000000 488b4510 488b4008 }
            // n = 6, score = 100
            //   4889e5               | mov                 ecx, dword ptr [ebp + 0x10]
            //   4883ec40             | call                eax
            //   48894d10             | dec                 eax
            //   c745fc00000000       | cmp                 eax, -1
            //   488b4510             | jne                 0x31c
            //   488b4008             | dec                 eax

        $sequence_5 = { 488945f8 488d55d8 488b45f8 41b800000000 4889c1 488b05???????? ffd0 }
            // n = 7, score = 100
            //   488945f8             | mov                 eax, dword ptr [ebp + 0x10]
            //   488d55d8             | dec                 eax
            //   488b45f8             | mov                 eax, dword ptr [eax]
            //   41b800000000         | inc                 ecx
            //   4889c1               | mov                 eax, edx
            //   488b05????????       |                     
            //   ffd0                 | ja                  0x1bd

        $sequence_6 = { 4889c1 e8???????? 85c0 7507 b800000000 eb22 }
            // n = 6, score = 100
            //   4889c1               | mov                 eax, dword ptr [ebp - 0x40]
            //   e8????????           |                     
            //   85c0                 | dec                 eax
            //   7507                 | add                 eax, edx
            //   b800000000           | dec                 eax
            //   eb22                 | shl                 eax, 3

        $sequence_7 = { ac 30e0 aa e2fa }
            // n = 4, score = 100
            //   ac                   | jne                 0x64a
            //   30e0                 | dec                 eax
            //   aa                   | mov                 eax, dword ptr [ebp + 0x10]
            //   e2fa                 | dec                 eax

        $sequence_8 = { 48898590000000 488b85e0020000 488b4018 48898598000000 488b85e0020000 488b4020 }
            // n = 6, score = 100
            //   48898590000000       | dec                 eax
            //   488b85e0020000       | mov                 edx, dword ptr [ebp - 0x48]
            //   488b4018             | dec                 eax
            //   48898598000000       | add                 eax, eax
            //   488b85e0020000       | dec                 eax
            //   488b4020             | add                 eax, edx

        $sequence_9 = { c70000000000 e8???????? e8???????? 8945fc 90 90 8b45fc }
            // n = 7, score = 100
            //   c70000000000         | mov                 ecx, eax
            //   e8????????           |                     
            //   e8????????           |                     
            //   8945fc               | dec                 eax
            //   90                   | mov                 eax, dword ptr [ebp - 8]
            //   90                   | dec                 eax
            //   8b45fc               | lea                 edx, [eax*8]

    condition:
        7 of them and filesize < 156672
}