rule win_moonwalk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.moonwalk."
        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.moonwalk"
        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 = { c1e808 c1ee08 45338c8c00020100 0fb6c8 410fb6c0 45338c8c00fa0000 45338c84301e0100 }
            // n = 7, score = 100
            //   c1e808               | mov                 dword ptr [esp + 0x24], edx
            //   c1ee08               | dec                 eax
            //   45338c8c00020100     | lea                 eax, [ecx + 0x80a0]
            //   0fb6c8               | jmp                 0x1cae
            //   410fb6c0             | dec                 esp
            //   45338c8c00fa0000     | mov                 eax, dword ptr [ecx + 0x10]
            //   45338c84301e0100     | dec                 eax

        $sequence_1 = { 49f7f0 488955d8 420fb6040a 33d2 304317 b818000000 49f7f0 }
            // n = 7, score = 100
            //   49f7f0               | dec                 ecx
            //   488955d8             | div                 eax
            //   420fb6040a           | inc                 edx
            //   33d2                 | movzx               eax, byte ptr [edx + ecx]
            //   304317               | xor                 edx, edx
            //   b818000000           | xor                 byte ptr [edi + 0x2d], al
            //   49f7f0               | mov                 eax, 0x2e

        $sequence_2 = { 8bc3 e9???????? 418bd9 8bc3 e9???????? 4c8b6c2438 33f6 }
            // n = 7, score = 100
            //   8bc3                 | mov                 esp, edi
            //   e9????????           |                     
            //   418bd9               | inc                 esp
            //   8bc3                 | sub                 edi, ebp
            //   e9????????           |                     
            //   4c8b6c2438           | dec                 eax
            //   33f6                 | inc                 edi

        $sequence_3 = { 4903fe 0fb62b 48ffc3 8bf5 448bf5 48c1ee04 }
            // n = 6, score = 100
            //   4903fe               | inc                 esp
            //   0fb62b               | sub                 edi, eax
            //   48ffc3               | add                 ebx, edx
            //   8bf5                 | mov                 eax, ecx
            //   448bf5               | shl                 eax, 0x19
            //   48c1ee04             | mov                 ecx, esi

        $sequence_4 = { 884706 418bc7 c1e810 0fb6c8 418bc6 48c1e818 418b948d00060100 }
            // n = 7, score = 100
            //   884706               | cmp                 dword ptr [eax], 4
            //   418bc7               | je                  0x6fa
            //   c1e810               | mov                 eax, 1
            //   0fb6c8               | dec                 esp
            //   418bc6               | lea                 ebx, [esp + 0x70]
            //   48c1e818             | dec                 ecx
            //   418b948d00060100     | mov                 ebx, dword ptr [ebx + 0x10]

        $sequence_5 = { 4889b42420010000 488d742430 490f45f0 4889bc2428010000 0f11442430 4c89a424f0000000 41bc20000000 }
            // n = 7, score = 100
            //   4889b42420010000     | jb                  0x778
            //   488d742430           | mov                 byte ptr [edi], 0xf0
            //   490f45f0             | dec                 eax
            //   4889bc2428010000     | mov                 ecx, edi
            //   0f11442430           | dec                 eax
            //   4c89a424f0000000     | cmp                 edi, edx
            //   41bc20000000         | jae                 0x751

        $sequence_6 = { e8???????? 488bf0 4885c0 0f849b000000 488b0d???????? 4533c9 48895c2450 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488bf0               | dec                 eax
            //   4885c0               | mov                 edi, dword ptr [esp + 0x40]
            //   0f849b000000         | mov                 ecx, 0xffffffff
            //   488b0d????????       |                     
            //   4533c9               | dec                 eax
            //   48895c2450           | test                eax, eax

        $sequence_7 = { 41884101 8bc3 c1f810 41884102 8bc1 c1f808 41884104 }
            // n = 7, score = 100
            //   41884101             | mov                 eax, ebx
            //   8bc3                 | inc                 esp
            //   c1f810               | sub                 eax, esi
            //   41884102             | dec                 eax
            //   8bc1                 | mov                 ebx, dword ptr [esp + 0xa0]
            //   c1f808               | inc                 ecx
            //   41884104             | lea                 ecx, [eax + 0xf0]

        $sequence_8 = { 48ffc1 4133c0 4469c093010001 483bca 72eb 4e8d0c36 bac59d1c81 }
            // n = 7, score = 100
            //   48ffc1               | mov                 eax, dword ptr [ebx]
            //   4133c0               | dec                 ecx
            //   4469c093010001       | cmp                 ebx, edi
            //   483bca               | jae                 0x2df
            //   72eb                 | nop                 dword ptr [eax + eax]
            //   4e8d0c36             | dec                 eax
            //   bac59d1c81           | mov                 eax, dword ptr [ecx]

        $sequence_9 = { c1e918 884354 884b53 8b4b04 8bc1 c1e808 884355 }
            // n = 7, score = 100
            //   c1e918               | mov                 ecx, dword ptr [ecx]
            //   884354               | dec                 eax
            //   884b53               | mov                 ebp, edx
            //   8b4b04               | mov                 edx, dword ptr [esi + 4]
            //   8bc1                 | lea                 eax, [ecx + edi]
            //   c1e808               | and                 eax, 0x1fffffff
            //   884355               | mov                 dword ptr [esi], eax

    condition:
        7 of them and filesize < 179200
}