rule win_sidetwist_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sidetwist."
        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.sidetwist"
        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 = { 53 4883ec20 488d05d47c0300 488901 4889cb 488d4910 e8???????? }
            // n = 7, score = 100
            //   53                   | lea                 ecx, [0x466ac]
            //   4883ec20             | inc                 ebp
            //   488d05d47c0300       | xor                 eax, eax
            //   488901               | xor                 edx, edx
            //   4889cb               | dec                 eax
            //   488d4910             | mov                 ecx, ebx
            //   e8????????           |                     

        $sequence_1 = { 4839d0 0f8563040000 488b4310 48c7c2ffffffff 488b7828 4885ff 740c }
            // n = 7, score = 100
            //   4839d0               | mov                 ecx, eax
            //   0f8563040000         | dec                 eax
            //   488b4310             | mov                 dword ptr [ebp - 8], eax
            //   48c7c2ffffffff       | dec                 eax
            //   488b7828             | lea                 eax, [ebp - 0x52]
            //   4885ff               | dec                 eax
            //   740c                 | cmp                 edx, eax

        $sequence_2 = { 488906 488b05???????? 8b10 85d2 0f857e030000 83430801 488d05864d0a00 }
            // n = 7, score = 100
            //   488906               | dec                 eax
            //   488b05????????       |                     
            //   8b10                 | mov                 ebx, ecx
            //   85d2                 | setne               al
            //   0f857e030000         | mov                 dword ptr [ecx + 8], eax
            //   83430801             | dec                 eax
            //   488d05864d0a00       | lea                 eax, [0x1f125]

        $sequence_3 = { 66480f6eea 488d1d259c0400 660f6cc2 488d151f9c0400 0f1180a0000000 66480f6ec1 66480f6eca }
            // n = 7, score = 100
            //   66480f6eea           | lea                 ebp, [esp + 0x30]
            //   488d1d259c0400       | dec                 eax
            //   660f6cc2             | mov                 dword ptr [ebp + 0x20], ecx
            //   488d151f9c0400       | dec                 eax
            //   0f1180a0000000       | mov                 dword ptr [ebp + 0x28], edx
            //   66480f6ec1           | dec                 eax
            //   66480f6eca           | mov                 eax, dword ptr [ebp + 0x28]

        $sequence_4 = { 4889c1 e8???????? 4885c0 0f94c0 84c0 7434 488d45f7 }
            // n = 7, score = 100
            //   4889c1               | dec                 eax
            //   e8????????           |                     
            //   4885c0               | mov                 dword ptr [ebx + 0xe0], eax
            //   0f94c0               | dec                 eax
            //   84c0                 | lea                 eax, [0x43821]
            //   7434                 | dec                 eax
            //   488d45f7             | lea                 edi, [ebx + 0x18]

        $sequence_5 = { 66480f6ee2 488d3d4d950400 660f6cc1 488d1554950400 0f118090000000 66480f6ec3 }
            // n = 6, score = 100
            //   66480f6ee2           | mov                 dword ptr [ebx + 0x40], esi
            //   488d3d4d950400       | dec                 eax
            //   660f6cc1             | mov                 dword ptr [ebx], eax
            //   488d1554950400       | mov                 eax, 0xffffffff
            //   0f118090000000       | dec                 eax
            //   66480f6ec3           | mov                 dword ptr [ecx - 8], 0

        $sequence_6 = { 4883ec20 488d05c4ba0400 488901 488b4120 4889cb 488b4918 48c7401800000000 }
            // n = 7, score = 100
            //   4883ec20             | dec                 eax
            //   488d05c4ba0400       | mov                 dword ptr [ebx + 0x10], eax
            //   488901               | dec                 eax
            //   488b4120             | lea                 ecx, [ebx + 0x60]
            //   4889cb               | dec                 eax
            //   488b4918             | add                 eax, 0x50
            //   48c7401800000000     | dec                 eax

        $sequence_7 = { 488d0d69fa0900 c70011000000 48894808 c3 488d0d57fa0900 c70010000000 48894808 }
            // n = 7, score = 100
            //   488d0d69fa0900       | dec                 eax
            //   c70011000000         | lea                 ecx, [ecx + 0x10]
            //   48894808             | dec                 eax
            //   c3                   | mov                 ecx, ebx
            //   488d0d57fa0900       | dec                 eax
            //   c70010000000         | add                 esp, 0x20
            //   48894808             | dec                 eax

        $sequence_8 = { 41395f58 0f85e8faffff 488b8c2440010000 4889f2 e8???????? e9???????? 488b4110 }
            // n = 7, score = 100
            //   41395f58             | je                  0x167
            //   0f85e8faffff         | dec                 eax
            //   488b8c2440010000     | mov                 eax, dword ptr [esi]
            //   4889f2               | dec                 eax
            //   e8????????           |                     
            //   e9????????           |                     
            //   488b4110             | lea                 edx, [0xfffe8a6b]

        $sequence_9 = { 7421 4531c9 4c8d05dc1f0100 488d15750d0100 e8???????? 4885c0 740b }
            // n = 7, score = 100
            //   7421                 | add                 eax, 0x50
            //   4531c9               | dec                 eax
            //   4c8d05dc1f0100       | mov                 ebx, ecx
            //   488d15750d0100       | dec                 eax
            //   e8????????           |                     
            //   4885c0               | lea                 ecx, [ecx + 0x18]
            //   740b                 | dec                 eax

    condition:
        7 of them and filesize < 2002944
}