rule win_rorschach_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.rorschach."
        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.rorschach"
        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 = { e8???????? 8885df000000 33d2 488d8da0000000 e8???????? 8885e0000000 b26d }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8885df000000         | inc                 eax
            //   33d2                 | nop                 
            //   488d8da0000000       | dec                 esp
            //   e8????????           |                     
            //   8885e0000000         | mov                 dword ptr [eax], ecx
            //   b26d                 | dec                 esp

        $sequence_1 = { 488bf0 400fb6d7 488d4dc8 e8???????? 8806 49ffc6 4983fe0e }
            // n = 7, score = 100
            //   488bf0               | lea                 ecx, [edx + 0x1640]
            //   400fb6d7             | dec                 eax
            //   488d4dc8             | lea                 ecx, [edx + 0x1680]
            //   e8????????           |                     
            //   8806                 | dec                 eax
            //   49ffc6               | lea                 ecx, [edx + 0x1640]
            //   4983fe0e             | dec                 eax

        $sequence_2 = { e9???????? 0fb75106 8915???????? 0fb77914 4803f9 488b0d???????? 4885c9 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   0fb75106             | dec                 ebp
            //   8915????????         |                     
            //   0fb77914             | lea                 esp, [esi + 0x448]
            //   4803f9               | dec                 eax
            //   488b0d????????       |                     
            //   4885c9               | lea                 edx, [ebp + 0x389]

        $sequence_3 = { e8???????? 8885d1070000 33d2 488d8dd0060000 e8???????? 8885d2070000 b222 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8885d1070000         | lea                 ecx, [ebp + 0x14e1]
            //   33d2                 | dec                 eax
            //   488d8dd0060000       | mov                 esi, eax
            //   e8????????           |                     
            //   8885d2070000         | mov                 word ptr [ebp + 0xb25], ax
            //   b222                 | dec                 esp

        $sequence_4 = { 0fb64db0 ebed 66c745bd0000 488b8da8000000 4903cf 488d55b1 e8???????? }
            // n = 7, score = 100
            //   0fb64db0             | mov                 dl, 0x67
            //   ebed                 | mov                 byte ptr [ebp + 0xe77], al
            //   66c745bd0000         | xor                 edx, edx
            //   488b8da8000000       | dec                 eax
            //   4903cf               | lea                 ecx, [ebp + 0xb30]
            //   488d55b1             | mov                 byte ptr [ebp + 0xe78], al
            //   e8????????           |                     

        $sequence_5 = { e8???????? 8885fa020000 b26e 488d8dd0020000 e8???????? 8885fb020000 33d2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8885fa020000         | mov                 edx, dword ptr [eax]
            //   b26e                 | dec                 ecx
            //   488d8dd0020000       | mov                 ecx, dword ptr [eax + 0x10]
            //   e8????????           |                     
            //   8885fb020000         | dec                 eax
            //   33d2                 | test                ecx, ecx

        $sequence_6 = { e8???????? 8885c00b0000 b265 488d8d300b0000 e8???????? 8885c10b0000 33d2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8885c00b0000         | nop                 dword ptr [eax]
            //   b265                 | nop                 dword ptr [eax + eax]
            //   488d8d300b0000       | dec                 ecx
            //   e8????????           |                     
            //   8885c10b0000         | mov                 edx, edi
            //   33d2                 | dec                 eax

        $sequence_7 = { eb0f 488bd3 488d0dff6c0300 e8???????? 33c9 85c0 480f44cb }
            // n = 7, score = 100
            //   eb0f                 | mov                 dword ptr [ebp + 0x1a0], edi
            //   488bd3               | dec                 eax
            //   488d0dff6c0300       | mov                 dword ptr [ebp + 0x1a8], 7
            //   e8????????           |                     
            //   33c9                 | inc                 sp
            //   85c0                 | mov                 dword ptr [ebp + 0x190], edi
            //   480f44cb             | dec                 eax

        $sequence_8 = { 4983ff12 72c1 ba12000000 488d8d91000000 e8???????? c60000 ba13000000 }
            // n = 7, score = 100
            //   4983ff12             | dec                 eax
            //   72c1                 | lea                 ecx, [ebp + 0x8e0]
            //   ba12000000           | xor                 edx, edx
            //   488d8d91000000       | dec                 eax
            //   e8????????           |                     
            //   c60000               | lea                 ecx, [ebp + 0x8e0]
            //   ba13000000           | mov                 byte ptr [ebp + 0xae8], al

        $sequence_9 = { e8???????? 8885ee090000 b273 488d8de0080000 e8???????? 8885ef090000 33d2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8885ee090000         | shr                 ax, cl
            //   b273                 | xor                 edx, edx
            //   488d8de0080000       | cmp                 bl, ch
            //   e8????????           |                     
            //   8885ef090000         | stc                 
            //   33d2                 | dec                 al

    condition:
        7 of them and filesize < 3921930
}