rule win_ave_maria_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.ave_maria."
        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.ave_maria"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 89462c 894634 894630 e8???????? 8bce 5e e9???????? }
            // n = 7, score = 400
            //   89462c               | mov                 dword ptr [esi + 0x2c], eax
            //   894634               | mov                 dword ptr [esi + 0x34], eax
            //   894630               | mov                 dword ptr [esi + 0x30], eax
            //   e8????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   5e                   | pop                 esi
            //   e9????????           |                     

        $sequence_1 = { 33db 57 391e 7408 8d4e0c e8???????? 6a02 }
            // n = 7, score = 400
            //   33db                 | xor                 ebx, ebx
            //   57                   | push                edi
            //   391e                 | cmp                 dword ptr [esi], ebx
            //   7408                 | je                  0xa
            //   8d4e0c               | lea                 ecx, dword ptr [esi + 0xc]
            //   e8????????           |                     
            //   6a02                 | push                2

        $sequence_2 = { 8bf1 57 33ff 397e40 740f ff7644 ff15???????? }
            // n = 7, score = 400
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   397e40               | cmp                 dword ptr [esi + 0x40], edi
            //   740f                 | je                  0x11
            //   ff7644               | push                dword ptr [esi + 0x44]
            //   ff15????????         |                     

        $sequence_3 = { ff15???????? 8bf0 81fe04010000 7629 8bcb e8???????? 33c9 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   81fe04010000         | cmp                 esi, 0x104
            //   7629                 | jbe                 0x2b
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_4 = { 33c2 894de4 33c6 c1c105 034df0 81c3a1ebd96e 03c8 }
            // n = 7, score = 400
            //   33c2                 | xor                 eax, edx
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   33c6                 | xor                 eax, esi
            //   c1c105               | rol                 ecx, 5
            //   034df0               | add                 ecx, dword ptr [ebp - 0x10]
            //   81c3a1ebd96e         | add                 ebx, 0x6ed9eba1
            //   03c8                 | add                 ecx, eax

        $sequence_5 = { 7408 8d4e14 e8???????? 8d4e14 e8???????? 8b4604 85c0 }
            // n = 7, score = 400
            //   7408                 | je                  0xa
            //   8d4e14               | lea                 ecx, dword ptr [esi + 0x14]
            //   e8????????           |                     
            //   8d4e14               | lea                 ecx, dword ptr [esi + 0x14]
            //   e8????????           |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   85c0                 | test                eax, eax

        $sequence_6 = { c21000 33c0 0f57c0 a3???????? a3???????? a3???????? b8???????? }
            // n = 7, score = 400
            //   c21000               | ret                 0x10
            //   33c0                 | xor                 eax, eax
            //   0f57c0               | xorps               xmm0, xmm0
            //   a3????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     
            //   b8????????           |                     

        $sequence_7 = { 03c7 0345c4 03d8 c1ce02 8b4ddc 8bc3 334dc8 }
            // n = 7, score = 400
            //   03c7                 | add                 eax, edi
            //   0345c4               | add                 eax, dword ptr [ebp - 0x3c]
            //   03d8                 | add                 ebx, eax
            //   c1ce02               | ror                 esi, 2
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8bc3                 | mov                 eax, ebx
            //   334dc8               | xor                 ecx, dword ptr [ebp - 0x38]

        $sequence_8 = { e9???????? 68???????? ff15???????? 68???????? 50 ff15???????? 85c0 }
            // n = 7, score = 400
            //   e9????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_9 = { 57 8d45f8 50 6819000200 6a00 68???????? }
            // n = 6, score = 400
            //   57                   | push                edi
            //   8d45f8               | lea                 eax, dword ptr [ebp - 8]
            //   50                   | push                eax
            //   6819000200           | push                0x20019
            //   6a00                 | push                0
            //   68????????           |                     

    condition:
        7 of them and filesize < 237568
}