rule win_crat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.crat."
        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.crat"
        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 = { 7406 e8???????? 90 488b542420 }
            // n = 4, score = 500
            //   7406                 | inc                 esp
            //   e8????????           |                     
            //   90                   | mov                 eax, edi
            //   488b542420           | je                  8

        $sequence_1 = { 7523 0fb7fa 8bcf e8???????? 4885c0 7427 448bc7 }
            // n = 7, score = 500
            //   7523                 | jne                 0x25
            //   0fb7fa               | movzx               edi, dx
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   4885c0               | dec                 eax
            //   7427                 | test                eax, eax
            //   448bc7               | je                  0x29

        $sequence_2 = { e8???????? 488bc8 4885c0 7433 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bc8               | lea                 ecx, [ebp - 0x70]
            //   4885c0               | nop                 
            //   7433                 | dec                 eax

        $sequence_3 = { e8???????? 488bd0 488d8d28010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | cmp                 ecx, eax
            //   488d8d28010000       | je                  0xb
            //   e8????????           |                     
            //   90                   | nop                 

        $sequence_4 = { e8???????? 488bd0 488d4d90 e8???????? 90 488bd0 }
            // n = 6, score = 500
            //   e8????????           |                     
            //   488bd0               | nop                 
            //   488d4d90             | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 edx, dword ptr [esp + 0x20]
            //   488bd0               | dec                 eax

        $sequence_5 = { e8???????? 488bd0 488d8da8010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 ecx
            //   488d8da8010000       | mov                 eax, esp
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_6 = { e8???????? 488bd0 488d8d78010000 e8???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bd0               | mov                 edx, eax
            //   488d8d78010000       | dec                 eax
            //   e8????????           |                     

        $sequence_7 = { 498bc4 48833d????????10 480f4305???????? 482bc8 }
            // n = 4, score = 500
            //   498bc4               | mov                 edx, eax
            //   48833d????????10     |                     
            //   480f4305????????     |                     
            //   482bc8               | dec                 eax

        $sequence_8 = { 33d2 c1e902 f7f1 eb02 }
            // n = 4, score = 300
            //   33d2                 | mov                 dword ptr [esi + 8], 0
            //   c1e902               | pop                 esi
            //   f7f1                 | mov                 esp, ebp
            //   eb02                 | pop                 ebp

        $sequence_9 = { ffd0 85c0 750f ff15???????? 83f87a }
            // n = 5, score = 300
            //   ffd0                 | mov                 edx, eax
            //   85c0                 | dec                 eax
            //   750f                 | lea                 ecx, [ebp + 0x1a8]
            //   ff15????????         |                     
            //   83f87a               | nop                 

        $sequence_10 = { c745fcffffffff 8b750c 83c6f0 8d460c }
            // n = 4, score = 200
            //   c745fcffffffff       | call                eax
            //   8b750c               | mov                 esi, eax
            //   83c6f0               | jmp                 4
            //   8d460c               | mov                 dword ptr [ebp - 4], 0xffffffff

        $sequence_11 = { 8b4dd4 41 e9???????? 8b45e4 }
            // n = 4, score = 200
            //   8b4dd4               | mov                 ebp, esp
            //   41                   | mov                 eax, dword ptr [ecx + 0x28]
            //   e9????????           |                     
            //   8b45e4               | sub                 eax, dword ptr [ecx + 0x24]

        $sequence_12 = { e8???????? ffd0 8bf0 eb02 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   ffd0                 | dec                 eax
            //   8bf0                 | mov                 edx, eax
            //   eb02                 | dec                 eax

        $sequence_13 = { 8bec 8b4128 2b4124 56 8d7118 83f810 }
            // n = 6, score = 200
            //   8bec                 | mov                 eax, edx
            //   8b4128               | mov                 edx, dword ptr [edi + 8]
            //   2b4124               | cmp                 ecx, edx
            //   56                   | jne                 0x52
            //   8d7118               | mov                 eax, edx
            //   83f810               | sub                 eax, ecx

        $sequence_14 = { e9???????? 8b5708 3bca 754e }
            // n = 4, score = 200
            //   e9????????           |                     
            //   8b5708               | sub                 edx, 0x10
            //   3bca                 | lea                 eax, [edx + 0xc]
            //   754e                 | lock xadd           dword ptr [eax], edi

        $sequence_15 = { 8b4dd4 41 837f1800 0f8517ffffff 294b0c }
            // n = 5, score = 200
            //   8b4dd4               | mov                 esi, dword ptr [ebp + 0xc]
            //   41                   | add                 esi, -0x10
            //   837f1800             | lea                 eax, [esi + 0xc]
            //   0f8517ffffff         | lock xadd           dword ptr [eax], ebx
            //   294b0c               | dec                 ebx

        $sequence_16 = { 8d45f4 64a300000000 c745fc00000000 c745f000000000 8b7508 c70600000000 e8???????? }
            // n = 7, score = 200
            //   8d45f4               | dec                 eax
            //   64a300000000         | mov                 edx, eax
            //   c745fc00000000       | dec                 eax
            //   c745f000000000       | lea                 ecx, [ebp + 0x190]
            //   8b7508               | nop                 
            //   c70600000000         | dec                 eax
            //   e8????????           |                     

        $sequence_17 = { c745fcffffffff 8b5608 83ea10 8d420c }
            // n = 4, score = 200
            //   c745fcffffffff       | lea                 ecx, [ebp + 0x128]
            //   8b5608               | nop                 
            //   83ea10               | dec                 eax
            //   8d420c               | test                edx, 0xffff0000

    condition:
        7 of them and filesize < 4161536
}