rule win_snatch_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.snatch_loader."
        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.snatch_loader"
        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 = { a3???????? 85c0 7403 57 }
            // n = 4, score = 600
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   57                   | push                edi

        $sequence_1 = { 33f6 8bd9 57 85c0 7522 }
            // n = 5, score = 600
            //   33f6                 | xor                 esi, esi
            //   8bd9                 | mov                 ebx, ecx
            //   57                   | push                edi
            //   85c0                 | test                eax, eax
            //   7522                 | jne                 0x24

        $sequence_2 = { eb0d 53 53 53 53 }
            // n = 5, score = 600
            //   eb0d                 | jmp                 0xf
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_3 = { eb05 53 56 57 ffd0 }
            // n = 5, score = 600
            //   eb05                 | jmp                 7
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ffd0                 | call                eax

        $sequence_4 = { 32c3 43 8802 42 83e901 75f2 }
            // n = 6, score = 600
            //   32c3                 | xor                 al, bl
            //   43                   | inc                 ebx
            //   8802                 | mov                 byte ptr [edx], al
            //   42                   | inc                 edx
            //   83e901               | sub                 ecx, 1
            //   75f2                 | jne                 0xfffffff4

        $sequence_5 = { 744b 33c0 66894606 a1???????? 85c0 }
            // n = 5, score = 600
            //   744b                 | je                  0x4d
            //   33c0                 | xor                 eax, eax
            //   66894606             | mov                 word ptr [esi + 6], ax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_6 = { a3???????? 85c0 7406 57 6a00 56 ffd0 }
            // n = 7, score = 600
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   57                   | push                edi
            //   6a00                 | push                0
            //   56                   | push                esi
            //   ffd0                 | call                eax

        $sequence_7 = { ffd0 8bf0 a1???????? 85c0 751d 33c9 }
            // n = 6, score = 600
            //   ffd0                 | call                eax
            //   8bf0                 | mov                 esi, eax
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   751d                 | jne                 0x1f
            //   33c9                 | xor                 ecx, ecx

        $sequence_8 = { eb03 83c704 83c304 41 }
            // n = 4, score = 500
            //   eb03                 | jmp                 5
            //   83c704               | add                 edi, 4
            //   83c304               | add                 ebx, 4
            //   41                   | inc                 ecx

        $sequence_9 = { 55 8bec 83c4fc 53 33db 837d0800 }
            // n = 6, score = 500
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83c4fc               | add                 esp, -4
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0

        $sequence_10 = { c9 c20c00 42 46 3bf3 76d8 }
            // n = 6, score = 500
            //   c9                   | leave               
            //   c20c00               | ret                 0xc
            //   42                   | inc                 edx
            //   46                   | inc                 esi
            //   3bf3                 | cmp                 esi, ebx
            //   76d8                 | jbe                 0xffffffda

        $sequence_11 = { 33d2 33c9 8a0431 0ac0 741f }
            // n = 5, score = 500
            //   33d2                 | xor                 edx, edx
            //   33c9                 | xor                 ecx, ecx
            //   8a0431               | mov                 al, byte ptr [ecx + esi]
            //   0ac0                 | or                  al, al
            //   741f                 | je                  0x21

        $sequence_12 = { 33c0 48 5a 59 5f 5e }
            // n = 6, score = 500
            //   33c0                 | xor                 eax, eax
            //   48                   | dec                 eax
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_13 = { 3a0439 7514 41 3b4df8 }
            // n = 4, score = 500
            //   3a0439               | cmp                 al, byte ptr [ecx + edi]
            //   7514                 | jne                 0x16
            //   41                   | inc                 ecx
            //   3b4df8               | cmp                 ecx, dword ptr [ebp - 8]

        $sequence_14 = { 7454 394508 734f ff7510 e8???????? 8945f8 0bc0 }
            // n = 7, score = 500
            //   7454                 | je                  0x56
            //   394508               | cmp                 dword ptr [ebp + 8], eax
            //   734f                 | jae                 0x51
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0bc0                 | or                  eax, eax

        $sequence_15 = { 0bc0 7454 394508 734f }
            // n = 4, score = 500
            //   0bc0                 | or                  eax, eax
            //   7454                 | je                  0x56
            //   394508               | cmp                 dword ptr [ebp + 8], eax
            //   734f                 | jae                 0x51

    condition:
        7 of them and filesize < 262144
}