rule win_kdcsponge_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kdcsponge."
        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.kdcsponge"
        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 = { e9???????? 4d3bc1 0f84a3000000 8b7500 498b9cf760020500 4885db 7407 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   4d3bc1               | dec                 eax
            //   0f84a3000000         | lea                 ecx, [0x24581]
            //   8b7500               | jmp                 0x1714
            //   498b9cf760020500     | jne                 0x1730
            //   4885db               | cmp                 byte ptr [ebx + 0x4bf], 1
            //   7407                 | mov                 dword ptr [ecx + 0x60], 0x140000

        $sequence_1 = { 4c8bc1 c7416002000100 e8???????? f20f1005???????? 4983a0a000000020 8b05???????? }
            // n = 6, score = 100
            //   4c8bc1               | add                 dword ptr [ebx + 0x420], eax
            //   c7416002000100       | cmp                 byte ptr [ebx + 0x4a4], 1
            //   e8????????           |                     
            //   f20f1005????????     |                     
            //   4983a0a000000020     | dec                 eax
            //   8b05????????         |                     

        $sequence_2 = { 80b9b104000001 0f85df000000 80b9ad04000000 0f85c9000000 f681ae04000008 0f84bc000000 80b9a404000000 }
            // n = 7, score = 100
            //   80b9b104000001       | dec                 eax
            //   0f85df000000         | mov                 eax, dword ptr [edi]
            //   80b9ad04000000       | dec                 eax
            //   0f85c9000000         | lea                 edx, [esp + 0x20]
            //   f681ae04000008       | dec                 eax
            //   0f84bc000000         | lea                 ecx, [0x2da37]
            //   80b9a404000000       | dec                 eax

        $sequence_3 = { ff15???????? 85c0 0f841c010000 85db 0f8497000000 83fb01 0f850b010000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | mov                 ecx, dword ptr [esp + 0x460]
            //   0f841c010000         | dec                 eax
            //   85db                 | xor                 ecx, esp
            //   0f8497000000         | jl                  0x782
            //   83fb01               | dec                 eax
            //   0f850b010000         | mov                 ebx, dword ptr [esp + 0x48]

        $sequence_4 = { 4881ec68010000 488b05???????? 4833c4 4889842450010000 488d442430 41b906000200 4533c0 }
            // n = 7, score = 100
            //   4881ec68010000       | cmp                 byte ptr [ecx + 0x4c2], 2
            //   488b05????????       |                     
            //   4833c4               | mov                 dword ptr [ecx + 0x440], 0x68
            //   4889842450010000     | inc                 esp
            //   488d442430           | cmove               eax, edx
            //   41b906000200         | inc                 esp
            //   4533c0               | mov                 dword ptr [ecx + 0x60], eax

        $sequence_5 = { 80b9c304000001 750c c681c504000003 e9???????? 33c0 c781a0040000ffffffff 898138010000 }
            // n = 7, score = 100
            //   80b9c304000001       | dec                 eax
            //   750c                 | mov                 dword ptr [esp + 0x40], ecx
            //   c681c504000003       | inc                 esp
            //   e9????????           |                     
            //   33c0                 | mov                 dword ptr [esp + 0x34], ebx
            //   c781a0040000ffffffff     | inc    esp
            //   898138010000         | mov                 dword ptr [esp + 0x20], edx

        $sequence_6 = { 498bce e8???????? 85c0 7442 e9???????? 488b9540070000 4c8d05e9aa0000 }
            // n = 7, score = 100
            //   498bce               | cmp                 byte ptr [ecx + 0x4bf], 0
            //   e8????????           |                     
            //   85c0                 | je                  0x15e0
            //   7442                 | cmp                 al, 1
            //   e9????????           |                     
            //   488b9540070000       | jne                 0x15f8
            //   4c8d05e9aa0000       | cmp                 cl, 1

        $sequence_7 = { f20f118384000000 89838c000000 c7833c04000020000000 4883c420 5b c3 33c0 }
            // n = 7, score = 100
            //   f20f118384000000     | mov                 edx, 0x105
            //   89838c000000         | mov                 dword ptr [ecx], eax
            //   c7833c04000020000000     | dec    eax
            //   4883c420             | lea                 ecx, [esp + 0x60]
            //   5b                   | movzx               edi, word ptr [ebp + 6]
            //   c3                   | jne                 0x1aaf
            //   33c0                 | mov                 ecx, dword ptr [ecx]

        $sequence_8 = { eb0a c7834004000002000000 488d8b10010000 488bd3 e8???????? 48c7835c02000002000000 c783ec01000020000000 }
            // n = 7, score = 100
            //   eb0a                 | mov                 eax, 0x140000
            //   c7834004000002000000     | inc    ecx
            //   488d8b10010000       | cmove               eax, eax
            //   488bd3               | add                 eax, 0x15
            //   e8????????           |                     
            //   48c7835c02000002000000     | jne    0xca7
            //   c783ec01000020000000     | cmp    al, 1

        $sequence_9 = { 4883c420 5b c3 3c02 7524 0fb601 488d15190cfeff }
            // n = 7, score = 100
            //   4883c420             | add                 esp, 0x20
            //   5b                   | mov                 dword ptr [ecx + 0x2a8], 0x20
            //   c3                   | dec                 eax
            //   3c02                 | mov                 dword ptr [ecx + 0x2d0], 1
            //   7524                 | dec                 eax
            //   0fb601               | mov                 dword ptr [ecx + 0x2d8], 1
            //   488d15190cfeff       | dec                 eax

    condition:
        7 of them and filesize < 720896
}