rule win_crat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { ebd0 498bc4 48833d????????10 480f4305???????? }
            // n = 4, score = 500
            //   ebd0                 | dec                 eax
            //   498bc4               | lea                 ecx, [ebp + 0x170]
            //   48833d????????10     |                     
            //   480f4305????????     |                     

        $sequence_1 = { e8???????? 488bd0 488d8da0010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8da0010000       | mov                 edx, eax
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_2 = { e8???????? 488bd0 488d8d40010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | lea                 ecx, [ebp + 0x158]
            //   488d8d40010000       | nop                 
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_3 = { e8???????? 488bd0 488d8d70010000 e8???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8d70010000       | mov                 edx, eax
            //   e8????????           |                     

        $sequence_4 = { e8???????? 488bd0 488d8d78010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | nop                 
            //   488d8d78010000       | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 edx, eax

        $sequence_5 = { e8???????? 488bd0 488d8d90010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | mov                 edx, eax
            //   488d8d90010000       | dec                 eax
            //   e8????????           |                     
            //   90                   | lea                 ecx, [ebp + 0x1a0]

        $sequence_6 = { e8???????? 488bd0 488d8d58010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | jmp                 0xffffffd2
            //   488d8d58010000       | dec                 ecx
            //   e8????????           |                     
            //   90                   | mov                 eax, esp

        $sequence_7 = { 483bc8 7406 e8???????? 90 488b542420 4883c2e8 }
            // n = 6, score = 500
            //   483bc8               | dec                 eax
            //   7406                 | lea                 ecx, [ebp + 0x140]
            //   e8????????           |                     
            //   90                   | nop                 
            //   488b542420           | dec                 eax
            //   4883c2e8             | mov                 edx, eax

        $sequence_8 = { ffd0 85c0 750f ff15???????? }
            // n = 4, score = 300
            //   ffd0                 | dec                 eax
            //   85c0                 | mov                 edx, dword ptr [esp + 0x20]
            //   750f                 | dec                 eax
            //   ff15????????         |                     

        $sequence_9 = { 33d2 c1e902 f7f1 eb02 }
            // n = 4, score = 300
            //   33d2                 | mov                 edi, dword ptr [esi]
            //   c1e902               | inc                 dword ptr [esi + 4]
            //   f7f1                 | shr                 eax, 0xc
            //   eb02                 | and                 al, 0x3f

        $sequence_10 = { e8???????? c645fc02 83c9ff 8b55ec }
            // n = 4, score = 200
            //   e8????????           |                     
            //   c645fc02             | mov                 dword ptr [esi + 0x24], 0
            //   83c9ff               | mov                 dword ptr [esi + 0x28], 0
            //   8b55ec               | lea                 ecx, [esi + 0x30]

        $sequence_11 = { 8d4e2c 68???????? c7461c00000000 c7462000000000 c7462400000000 c7462800000000 e8???????? }
            // n = 7, score = 200
            //   8d4e2c               | dec                 eax
            //   68????????           |                     
            //   c7461c00000000       | mov                 edx, eax
            //   c7462000000000       | dec                 eax
            //   c7462400000000       | lea                 ecx, [ebp + 0x338]
            //   c7462800000000       | nop                 
            //   e8????????           |                     

        $sequence_12 = { c1e80c 243f 0c80 8801 8b3e }
            // n = 5, score = 200
            //   c1e80c               | jmp                 0x4d
            //   243f                 | cmp                 eax, 1
            //   0c80                 | jge                 0x11
            //   8801                 | shr                 eax, 0xc
            //   8b3e                 | or                  al, 0xe0

        $sequence_13 = { 0f42f8 85ff 751f 51 }
            // n = 4, score = 200
            //   0f42f8               | inc                 dword ptr [esi + 4]
            //   85ff                 | mov                 eax, dword ptr [edi + 0x10]
            //   751f                 | sub                 eax, dword ptr [edi + 0xc]
            //   51                   | lea                 ecx, [esi + 0x40]

        $sequence_14 = { c1e80c 0ce0 eb49 83f801 }
            // n = 4, score = 200
            //   c1e80c               | lea                 ecx, [ebp + 0x338]
            //   0ce0                 | nop                 
            //   eb49                 | call                eax
            //   83f801               | test                eax, eax

        $sequence_15 = { c1e812 0cf0 8801 8b3e }
            // n = 4, score = 200
            //   c1e812               | mov                 edx, dword ptr [ebp - 0x14]
            //   0cf0                 | add                 edx, -0x10
            //   8801                 | lea                 eax, [edx + 0xc]
            //   8b3e                 | mov                 byte ptr [ebp - 4], 2

        $sequence_16 = { e8???????? ffd0 8bf0 eb02 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   ffd0                 | nop                 
            //   8bf0                 | dec                 eax
            //   eb02                 | mov                 edx, dword ptr [esp + 0x20]

        $sequence_17 = { 8d4e30 c645fc05 e8???????? c645fc06 }
            // n = 4, score = 200
            //   8d4e30               | dec                 eax
            //   c645fc05             | cmp                 ecx, eax
            //   e8????????           |                     
            //   c645fc06             | je                  8

    condition:
        7 of them and filesize < 4161536
}