rule win_kikothac_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kikothac."
        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.kikothac"
        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 = { 9c 8d642448 e9???????? 895c2434 e9???????? }
            // n = 5, score = 200
            //   9c                   | pushfd              
            //   8d642448             | lea                 esp, [esp + 0x48]
            //   e9????????           |                     
            //   895c2434             | mov                 dword ptr [esp + 0x34], ebx
            //   e9????????           |                     

        $sequence_1 = { f8 6639d4 6698 c64424080e 50 38c6 98 }
            // n = 7, score = 200
            //   f8                   | clc                 
            //   6639d4               | cmp                 sp, dx
            //   6698                 | cbw                 
            //   c64424080e           | mov                 byte ptr [esp + 8], 0xe
            //   50                   | push                eax
            //   38c6                 | cmp                 dh, al
            //   98                   | cwde                

        $sequence_2 = { 9c e8???????? c6042405 c644241079 ff742430 8f4500 }
            // n = 6, score = 200
            //   9c                   | pushfd              
            //   e8????????           |                     
            //   c6042405             | mov                 byte ptr [esp], 5
            //   c644241079           | mov                 byte ptr [esp + 0x10], 0x79
            //   ff742430             | push                dword ptr [esp + 0x30]
            //   8f4500               | pop                 dword ptr [ebp]

        $sequence_3 = { 68ff010f00 50 8955e8 ff15???????? 85c0 7419 8b13 }
            // n = 7, score = 200
            //   68ff010f00           | push                0xf01ff
            //   50                   | push                eax
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7419                 | je                  0x1b
            //   8b13                 | mov                 edx, dword ptr [ebx]

        $sequence_4 = { 85f6 7e34 ff15???????? a3???????? 8bc6 8d9de0f8ffff b9???????? }
            // n = 7, score = 200
            //   85f6                 | test                esi, esi
            //   7e34                 | jle                 0x36
            //   ff15????????         |                     
            //   a3????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   8d9de0f8ffff         | lea                 ebx, [ebp - 0x720]
            //   b9????????           |                     

        $sequence_5 = { ff3424 66894500 9c ff3424 8d642438 e9???????? 0fc0c1 }
            // n = 7, score = 200
            //   ff3424               | push                dword ptr [esp]
            //   66894500             | mov                 word ptr [ebp], ax
            //   9c                   | pushfd              
            //   ff3424               | push                dword ptr [esp]
            //   8d642438             | lea                 esp, [esp + 0x38]
            //   e9????????           |                     
            //   0fc0c1               | xadd                cl, al

        $sequence_6 = { 33c0 40 e9???????? 8365d800 c745dc59cb4000 }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   e9????????           |                     
            //   8365d800             | and                 dword ptr [ebp - 0x28], 0
            //   c745dc59cb4000       | mov                 dword ptr [ebp - 0x24], 0x40cb59

        $sequence_7 = { 8b4df4 03c2 668b55f8 8908 8a4dfa 66895004 884806 }
            // n = 7, score = 200
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   03c2                 | add                 eax, edx
            //   668b55f8             | mov                 dx, word ptr [ebp - 8]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8a4dfa               | mov                 cl, byte ptr [ebp - 6]
            //   66895004             | mov                 word ptr [eax + 4], dx
            //   884806               | mov                 byte ptr [eax + 6], cl

        $sequence_8 = { 57 51 ff15???????? 85c0 0f85ae000000 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85ae000000         | jne                 0xb4

        $sequence_9 = { 50 8d75f0 e8???????? 8b75f8 85f6 75d9 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8d75f0               | lea                 esi, [ebp - 0x10]
            //   e8????????           |                     
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   85f6                 | test                esi, esi
            //   75d9                 | jne                 0xffffffdb

    condition:
        7 of them and filesize < 581632
}