rule win_crat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { e8???????? 488bd0 488d8d28010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8d28010000       | lea                 ecx, [ebp - 0x70]
            //   e8????????           |                     
            //   90                   | nop                 

        $sequence_1 = { ebd0 498bc4 48833d????????10 480f4305???????? 482bc8 }
            // n = 5, score = 500
            //   ebd0                 | lea                 ecx, [ebp + 0xe8]
            //   498bc4               | nop                 
            //   48833d????????10     |                     
            //   480f4305????????     |                     
            //   482bc8               | jmp                 0xffffffd2

        $sequence_2 = { 48f7c20000ffff 7523 0fb7fa 8bcf e8???????? 4885c0 7427 }
            // n = 7, score = 500
            //   48f7c20000ffff       | dec                 eax
            //   7523                 | mov                 edx, eax
            //   0fb7fa               | dec                 eax
            //   8bcf                 | lea                 ecx, [ebp + 0x178]
            //   e8????????           |                     
            //   4885c0               | dec                 eax
            //   7427                 | mov                 edx, eax

        $sequence_3 = { e8???????? 488bc8 4885c0 7433 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bc8               | dec                 ecx
            //   4885c0               | mov                 eax, esp
            //   7433                 | dec                 eax

        $sequence_4 = { e8???????? 488bd0 488d8de8000000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8de8000000       | mov                 edx, eax
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_5 = { e8???????? 488bd0 488d4d90 e8???????? 90 488bd0 }
            // n = 6, score = 500
            //   e8????????           |                     
            //   488bd0               | mov                 ecx, eax
            //   488d4d90             | dec                 eax
            //   e8????????           |                     
            //   90                   | test                eax, eax
            //   488bd0               | je                  0x35

        $sequence_6 = { e8???????? 488bd0 488d8d88010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8d88010000       | mov                 edx, eax
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_7 = { e8???????? 488bd0 488d8d78010000 e8???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bd0               | sub                 ecx, eax
            //   488d8d78010000       | dec                 eax
            //   e8????????           |                     

        $sequence_8 = { ffd0 85c0 750f ff15???????? 83f87a }
            // n = 5, score = 300
            //   ffd0                 | nop                 
            //   85c0                 | dec                 eax
            //   750f                 | mov                 edx, eax
            //   ff15????????         |                     
            //   83f87a               | dec                 eax

        $sequence_9 = { 33d2 c1e902 f7f1 eb02 }
            // n = 4, score = 300
            //   33d2                 | lock xadd           dword ptr [eax], ecx
            //   c1e902               | mov                 dword ptr [ebp - 4], 0xffffffff
            //   f7f1                 | mov                 edx, dword ptr [esi + 8]
            //   eb02                 | sub                 edx, 0x10

        $sequence_10 = { 52 8b01 ff5004 c645fc0b 8bcf 8b5658 83ea10 }
            // n = 7, score = 200
            //   52                   | shr                 ecx, 2
            //   8b01                 | div                 ecx
            //   ff5004               | jmp                 9
            //   c645fc0b             | mov                 ecx, edx
            //   8bcf                 | xor                 edx, edx
            //   8b5658               | shr                 ecx, 2
            //   83ea10               | div                 ecx

        $sequence_11 = { 8b5648 83ea10 8d420c f00fc108 49 85c9 }
            // n = 6, score = 200
            //   8b5648               | call                eax
            //   83ea10               | test                eax, eax
            //   8d420c               | jne                 0x11
            //   f00fc108             | call                eax
            //   49                   | mov                 esi, eax
            //   85c9                 | jmp                 4

        $sequence_12 = { e8???????? ffd0 8bf0 eb02 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   ffd0                 | mov                 edx, eax
            //   8bf0                 | dec                 eax
            //   eb02                 | lea                 ecx, [ebp + 0x1a8]

        $sequence_13 = { e9???????? 8b45e4 8b4dd4 8945d8 }
            // n = 4, score = 200
            //   e9????????           |                     
            //   8b45e4               | lea                 ecx, [ecx - 0x18]
            //   8b4dd4               | inc                 edi
            //   8945d8               | mov                 dword ptr [ebp - 0x1c], edi

        $sequence_14 = { 8d49e8 47 897de4 8d0c48 894dd4 }
            // n = 5, score = 200
            //   8d49e8               | nop                 
            //   47                   | dec                 eax
            //   897de4               | cmp                 ecx, eax
            //   8d0c48               | je                  8
            //   894dd4               | nop                 

        $sequence_15 = { c745fcffffffff 8b5608 83ea10 8d420c }
            // n = 4, score = 200
            //   c745fcffffffff       | mov                 edx, dword ptr [esi + 0x58]
            //   8b5608               | sub                 edx, 0x10
            //   83ea10               | lea                 eax, [edx + 0xc]
            //   8d420c               | lock xadd           dword ptr [eax], ecx

        $sequence_16 = { c645fc00 8bcf 8b560c 83ea10 }
            // n = 4, score = 200
            //   c645fc00             | lock xadd           dword ptr [eax], ecx
            //   8bcf                 | dec                 ecx
            //   8b560c               | mov                 edx, dword ptr [esi + 0x54]
            //   83ea10               | sub                 edx, 0x10

        $sequence_17 = { 8bec 56 8bf1 57 837e0c00 751b }
            // n = 6, score = 200
            //   8bec                 | mov                 eax, dword ptr [ebp - 0x1c]
            //   56                   | mov                 esi, dword ptr [ebp - 0x20]
            //   8bf1                 | mov                 edx, dword ptr [esi + 0x4c]
            //   57                   | sub                 edx, 0x10
            //   837e0c00             | lea                 eax, [edx + 0xc]
            //   751b                 | lock xadd           dword ptr [eax], ecx

    condition:
        7 of them and filesize < 4161536
}