rule win_ksl0t_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.ksl0t."
        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.ksl0t"
        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 = { 66898424d0040000 488dbc24d2040000 33c0 b906020000 f3aa }
            // n = 5, score = 200
            //   66898424d0040000     | add                 edx, 0x96
            //   488dbc24d2040000     | inc                 ecx
            //   33c0                 | mov                 eax, 1
            //   b906020000           | dec                 eax
            //   f3aa                 | lea                 ecx, [0xe6b1]

        $sequence_1 = { 894dd8 3bce 732b b81f85eb51 f7e3 c1ea05 6bd264 }
            // n = 7, score = 200
            //   894dd8               | mov                 dword ptr [ebp - 0x28], ecx
            //   3bce                 | cmp                 ecx, esi
            //   732b                 | jae                 0x2d
            //   b81f85eb51           | mov                 eax, 0x51eb851f
            //   f7e3                 | mul                 ebx
            //   c1ea05               | shr                 edx, 5
            //   6bd264               | imul                edx, edx, 0x64

        $sequence_2 = { 49d1e0 488d9424b0100000 488d0d2eec0000 ff15???????? }
            // n = 4, score = 200
            //   49d1e0               | dec                 eax
            //   488d9424b0100000     | lea                 edx, [0xc405]
            //   488d0d2eec0000       | dec                 eax
            //   ff15????????         |                     

        $sequence_3 = { 55 8dac2494f7ffff 81ec6c080000 6afe }
            // n = 4, score = 200
            //   55                   | push                ebp
            //   8dac2494f7ffff       | lea                 ebp, [esp - 0x86c]
            //   81ec6c080000         | sub                 esp, 0x86c
            //   6afe                 | push                -2

        $sequence_4 = { 8d8500080000 50 ff15???????? 897dcc 8d4dcc 51 53 }
            // n = 7, score = 200
            //   8d8500080000         | lea                 eax, [ebp + 0x800]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   897dcc               | mov                 dword ptr [ebp - 0x34], edi
            //   8d4dcc               | lea                 ecx, [ebp - 0x34]
            //   51                   | push                ecx
            //   53                   | push                ebx

        $sequence_5 = { c684249e02000027 c684249f02000032 c68424a002000023 c68424a102000002 }
            // n = 4, score = 200
            //   c684249e02000027     | mov                 eax, dword ptr [esp + 0x14b4]
            //   c684249f02000032     | dec                 eax
            //   c68424a002000023     | lea                 edx, [0xc95a]
            //   c68424a102000002     | dec                 ecx

        $sequence_6 = { 68???????? 68???????? ff15???????? 8935???????? 83c40c 393d???????? }
            // n = 6, score = 200
            //   68????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   8935????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   393d????????         |                     

        $sequence_7 = { 41b800020000 33d2 488d8c24b0100000 ff15???????? 448b8424b4140000 488d155ac90000 }
            // n = 6, score = 200
            //   41b800020000         | call                dword ptr [esp + 0x418]
            //   33d2                 | dec                 esp
            //   488d8c24b0100000     | mov                 ebx, eax
            //   ff15????????         |                     
            //   448b8424b4140000     | dec                 eax
            //   488d155ac90000       | mov                 eax, dword ptr [esp + 0x420]

        $sequence_8 = { 488b842420040000 4c899870010000 488d9424e8010000 488b8c24e0000000 ff942418040000 4c8bd8 488b842420040000 }
            // n = 7, score = 200
            //   488b842420040000     | mov                 dword ptr [esp + 0x14b4], eax
            //   4c899870010000       | inc                 ecx
            //   488d9424e8010000     | mov                 eax, 0x200
            //   488b8c24e0000000     | dec                 eax
            //   ff942418040000       | mov                 eax, dword ptr [esp + 0x420]
            //   4c8bd8               | dec                 esp
            //   488b842420040000     | mov                 dword ptr [eax + 0x170], ebx

        $sequence_9 = { c68424e100000027 888424e2000000 c68424e300000034 889c24e4000000 888424e5000000 c68424e600000018 }
            // n = 6, score = 200
            //   c68424e100000027     | mov                 byte ptr [esp + 0xe1], 0x27
            //   888424e2000000       | mov                 byte ptr [esp + 0xe2], al
            //   c68424e300000034     | mov                 byte ptr [esp + 0xe3], 0x34
            //   889c24e4000000       | mov                 byte ptr [esp + 0xe4], bl
            //   888424e5000000       | mov                 byte ptr [esp + 0xe5], al
            //   c68424e600000018     | mov                 byte ptr [esp + 0xe6], 0x18

        $sequence_10 = { 83f819 72f3 33c0 90 308c0400010000 }
            // n = 5, score = 200
            //   83f819               | cmp                 eax, 0x19
            //   72f3                 | jb                  0xfffffff5
            //   33c0                 | xor                 eax, eax
            //   90                   | nop                 
            //   308c0400010000       | xor                 byte ptr [esp + eax + 0x100], cl

        $sequence_11 = { 2bc1 56 57 89442418 }
            // n = 4, score = 200
            //   2bc1                 | sub                 eax, ecx
            //   56                   | push                esi
            //   57                   | push                edi
            //   89442418             | mov                 dword ptr [esp + 0x18], eax

        $sequence_12 = { 6a04 68???????? 68???????? ff15???????? 83c40c e9???????? 6a07 }
            // n = 7, score = 200
            //   6a04                 | push                4
            //   68????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   e9????????           |                     
            //   6a07                 | push                7

        $sequence_13 = { 488d1505c40000 4881c296000000 41b801000000 488d0db1e60000 }
            // n = 4, score = 200
            //   488d1505c40000       | dec                 eax
            //   4881c296000000       | lea                 edx, [esp + 0x1e8]
            //   41b801000000         | dec                 eax
            //   488d0db1e60000       | mov                 ecx, dword ptr [esp + 0xe0]

        $sequence_14 = { 83c00c 898424f4080000 0fb705???????? 85c0 7475 488d152adc0000 4883c20c }
            // n = 7, score = 200
            //   83c00c               | inc                 ecx
            //   898424f4080000       | mov                 eax, 0x200
            //   0fb705????????       |                     
            //   85c0                 | xor                 edx, edx
            //   7475                 | dec                 eax
            //   488d152adc0000       | lea                 ecx, [esp + 0x10b0]
            //   4883c20c             | inc                 esp

        $sequence_15 = { 4889442458 48837c245800 756e ff15???????? 898424b4140000 41b800020000 }
            // n = 6, score = 200
            //   4889442458           | dec                 eax
            //   48837c245800         | mov                 dword ptr [esp + 0x58], eax
            //   756e                 | dec                 eax
            //   ff15????????         |                     
            //   898424b4140000       | cmp                 dword ptr [esp + 0x58], 0
            //   41b800020000         | jne                 0x70

    condition:
        7 of them and filesize < 196608
}