rule win_doublefinger_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.doublefinger."
        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.doublefinger"
        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 = { c644046890 b801000000 486bc007 c644046897 c74424500d4ce35c b8c90d0000 6689442454 }
            // n = 7, score = 100
            //   c644046890           | cmp                 eax, dword ptr [esp + 0x28]
            //   b801000000           | jbe                 0x8d
            //   486bc007             | dec                 eax
            //   c644046897           | lea                 ecx, [esp + 0x20]
            //   c74424500d4ce35c     | dec                 eax
            //   b8c90d0000           | mov                 eax, dword ptr [esp + 0x58]
            //   6689442454           | call                dword ptr [eax + 0xb0]

        $sequence_1 = { 488b0d???????? 4c8bcb 4533c0 bac2000000 }
            // n = 4, score = 100
            //   488b0d????????       |                     
            //   4c8bcb               | add                 ecx, eax
            //   4533c0               | dec                 eax
            //   bac2000000           | sub                 esp, 0x28

        $sequence_2 = { e8???????? 89442420 488d4c2420 488b442440 ff90b0000000 8b4c2448 8b542450 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   89442420             | mov                 eax, dword ptr [esp + 0x24]
            //   488d4c2420           | dec                 eax
            //   488b442440           | mov                 edx, dword ptr [esp + 0x58]
            //   ff90b0000000         | dec                 eax
            //   8b4c2448             | mov                 ecx, eax
            //   8b542450             | mov                 eax, dword ptr [esp + 0x24]

        $sequence_3 = { 4889842490020000 c78424f8010000436f496e c78424fc01000069746961 c78424000200006c697a65 c784240402000000000000 }
            // n = 5, score = 100
            //   4889842490020000     | je                  0x2d5
            //   c78424f8010000436f496e     | mov    eax, dword ptr [esp + 0x20]
            //   c78424fc01000069746961     | dec    eax
            //   c78424000200006c697a65     | mov    ecx, dword ptr [esp + 0x60]
            //   c784240402000000000000     | movzx    ecx, byte ptr [esp + 1]

        $sequence_4 = { baf961bb46 488b8c2480000000 e8???????? 4889842420040000 }
            // n = 4, score = 100
            //   baf961bb46           | dec                 esp
            //   488b8c2480000000     | lea                 eax, [0x4fe7]
            //   e8????????           |                     
            //   4889842420040000     | dec                 eax

        $sequence_5 = { 488b842468010000 488b88a8000000 e8???????? 488b442438 488b00 488b4c2438 ff5048 }
            // n = 7, score = 100
            //   488b842468010000     | dec                 eax
            //   488b88a8000000       | mov                 dword ptr [esp + 8], ecx
            //   e8????????           |                     
            //   488b442438           | dec                 eax
            //   488b00               | sub                 esp, 0x28
            //   488b4c2438           | mov                 eax, dword ptr [esp + 0x38]
            //   ff5048               | dec                 eax

        $sequence_6 = { 8b05???????? 83f801 751d 488d1593120000 488d0d7c120000 }
            // n = 5, score = 100
            //   8b05????????         |                     
            //   83f801               | mov                 eax, dword ptr [esp + 0x30]
            //   751d                 | dec                 eax
            //   488d1593120000       | mov                 eax, dword ptr [esp + 0x38]
            //   488d0d7c120000       | mov                 ecx, dword ptr [esp + 0x20]

        $sequence_7 = { 4533c0 8b942410010000 488b4c2450 e8???????? 4889842438020000 4533c0 8b942414010000 }
            // n = 7, score = 100
            //   4533c0               | dec                 eax
            //   8b942410010000       | lea                 ecx, [esp + 0x30]
            //   488b4c2450           | dec                 eax
            //   e8????????           |                     
            //   4889842438020000     | mov                 eax, dword ptr [esp + 0x70]
            //   4533c0               | call                dword ptr [eax + 0x48]
            //   8b942414010000       | mov                 edx, 0x18

        $sequence_8 = { 8b08 e8???????? 89442424 488b442440 4883c008 4889442458 }
            // n = 6, score = 100
            //   8b08                 | inc                 esp
            //   e8????????           |                     
            //   89442424             | mov                 eax, dword ptr [eax + 0xc]
            //   488b442440           | dec                 eax
            //   4883c008             | mov                 eax, dword ptr [esp + 0x1d0]
            //   4889442458           | mov                 edx, dword ptr [eax + 8]

        $sequence_9 = { 8bc0 8bd0 b940000000 488b8424d0000000 ff5038 4889442458 48837c245800 }
            // n = 7, score = 100
            //   8bc0                 | mov                 eax, dword ptr [esp]
            //   8bd0                 | dec                 eax
            //   b940000000           | mov                 ecx, dword ptr [esp + 0x20]
            //   488b8424d0000000     | dec                 eax
            //   ff5038               | lea                 eax, [ecx + eax*2 + 2]
            //   4889442458           | dec                 eax
            //   48837c245800         | mov                 dword ptr [esp + 0x24], eax

    condition:
        7 of them and filesize < 115712
}