rule win_snatchcrypto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.snatchcrypto."
        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.snatchcrypto"
        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 = { 7441 e8???????? ba01000000 488bcb ff15???????? 85c0 7821 }
            // n = 7, score = 200
            //   7441                 | je                  0x2ca
            //   e8????????           |                     
            //   ba01000000           | mov                 ecx, eax
            //   488bcb               | dec                 eax
            //   ff15????????         |                     
            //   85c0                 | add                 ecx, dword ptr [esp + 0x90]
            //   7821                 | jne                 0x6ea

        $sequence_1 = { 488d05b2650200 488d15474a0200 480f45d0 4c8d0553ac0200 488d05bd050300 4885db 4d8bc8 }
            // n = 7, score = 200
            //   488d05b2650200       | mov                 ecx, esi
            //   488d15474a0200       | mov                 dword ptr [esp + 0xe0], ebp
            //   480f45d0             | dec                 esp
            //   4c8d0553ac0200       | mov                 eax, dword ptr [esp + 0x78]
            //   488d05bd050300       | dec                 eax
            //   4885db               | lea                 edx, [0x1e3d6]
            //   4d8bc8               | mov                 dword ptr [esp + 0xe0], ebp

        $sequence_2 = { 488b5310 488b83c8030000 4c8d8c24b0000000 4883c275 4d8bc6 488bcb 4889442420 }
            // n = 7, score = 200
            //   488b5310             | jmp                 0x1e00
            //   488b83c8030000       | xor                 eax, eax
            //   4c8d8c24b0000000     | cmp                 byte ptr [ebx + 0x38c], 0
            //   4883c275             | je                  0x1e2c
            //   4d8bc6               | cmp                 byte ptr [ebx + 0x3a0], 0
            //   488bcb               | je                  0x1e2c
            //   4889442420           | mov                 eax, dword ptr [ebx + 0x388]

        $sequence_3 = { e8???????? 488d4c2430 448bc7 498bd4 e8???????? 488d15ae880600 488d4c2430 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   488d4c2430           | xor                 ebp, dword ptr [eax + ecx*4]
            //   448bc7               | inc                 ebp
            //   498bd4               | xor                 ebp, dword ptr [eax + eax*4 + 0xc00]
            //   e8????????           |                     
            //   488d15ae880600       | mov                 eax, ebx
            //   488d4c2430           | inc                 esp

        $sequence_4 = { 488b9340050000 488d0d32090300 e8???????? 4889442450 48898630030000 4885c0 0f845cffffff }
            // n = 7, score = 200
            //   488b9340050000       | inc                 edx
            //   488d0d32090300       | mov                 byte ptr [esp + eax], al
            //   e8????????           |                     
            //   4889442450           | inc                 ecx
            //   48898630030000       | movzx               eax, byte ptr [eax + ebp + 0x87929]
            //   4885c0               | dec                 eax
            //   0f845cffffff         | dec                 eax

        $sequence_5 = { 4f8b8cca80550800 4c8d05ed390200 488d8b60080000 baff3f0000 89442420 e8???????? 4533c9 }
            // n = 7, score = 200
            //   4f8b8cca80550800     | jmp                 0x51f
            //   4c8d05ed390200       | cmp                 dword ptr [ebx + 0x468], 0
            //   488d8b60080000       | dec                 esp
            //   baff3f0000           | mov                 eax, dword ptr [ebp + 0x5a8]
            //   89442420             | dec                 eax
            //   e8????????           |                     
            //   4533c9               | lea                 eax, [0x2636b]

        $sequence_6 = { 8bc2 c3 ba9e010000 8bc2 c3 baa0010000 8bc2 }
            // n = 7, score = 200
            //   8bc2                 | dec                 eax
            //   c3                   | mov                 edx, esi
            //   ba9e010000           | inc                 ecx
            //   8bc2                 | mov                 eax, dword ptr [edi + 0x88]
            //   c3                   | dec                 esp
            //   baa0010000           | mov                 ecx, dword ptr [esp + 0xe8]
            //   8bc2                 | dec                 eax

        $sequence_7 = { 80f901 7517 b8ffdf0000 888b7f020000 6623d0 66899394030000 eb0b }
            // n = 7, score = 200
            //   80f901               | inc                 ecx
            //   7517                 | mov                 esp, 0x100
            //   b8ffdf0000           | xor                 edx, edx
            //   888b7f020000         | inc                 ecx
            //   6623d0               | mov                 eax, 0x206
            //   66899394030000       | inc                 ecx
            //   eb0b                 | mov                 edi, esi

        $sequence_8 = { 488d5590 488d4d80 e8???????? 488d0d7f650100 4d8bc5 488bd3 e8???????? }
            // n = 7, score = 200
            //   488d5590             | lea                 eax, [0x30cc2]
            //   488d4d80             | ret                 
            //   e8????????           |                     
            //   488d0d7f650100       | dec                 eax
            //   4d8bc5               | lea                 eax, [0x30c9a]
            //   488bd3               | ret                 
            //   e8????????           |                     

        $sequence_9 = { 488d05745b0600 4c3bd0 7405 e8???????? 488bc3 eb02 33c0 }
            // n = 7, score = 200
            //   488d05745b0600       | jne                 0x2b7
            //   4c3bd0               | dec                 eax
            //   7405                 | lea                 edx, [0x22f83]
            //   e8????????           |                     
            //   488bc3               | inc                 ebp
            //   eb02                 | mov                 eax, ecx
            //   33c0                 | dec                 ecx

    condition:
        7 of them and filesize < 1400832
}