rule win_ave_maria_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 47 8d4de8 e8???????? 8b4df0 e8???????? 8d4df8 e8???????? }
            // n = 7, score = 400
            //   47                   | inc                 edi
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   e8????????           |                     
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     

        $sequence_1 = { 56 57 33ff 8bf2 57 8bd9 ff15???????? }
            // n = 7, score = 400
            //   56                   | push                esi
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   8bf2                 | mov                 esi, edx
            //   57                   | push                edi
            //   8bd9                 | mov                 ebx, ecx
            //   ff15????????         |                     

        $sequence_2 = { 03cb 8b5dfc 03c1 c1cb02 8b4de0 8bd0 334dbc }
            // n = 7, score = 400
            //   03cb                 | add                 ecx, ebx
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]
            //   03c1                 | add                 eax, ecx
            //   c1cb02               | ror                 ebx, 2
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8bd0                 | mov                 edx, eax
            //   334dbc               | xor                 ecx, dword ptr [ebp - 0x44]

        $sequence_3 = { 50 ff15???????? 85c0 7427 85ff 7e1a 8b55f0 }
            // n = 7, score = 400
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7427                 | je                  0x29
            //   85ff                 | test                edi, edi
            //   7e1a                 | jle                 0x1c
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]

        $sequence_4 = { c1cf08 c1c105 81e700ff00ff 0bf8 8bc6 33c3 897dc4 }
            // n = 7, score = 400
            //   c1cf08               | ror                 edi, 8
            //   c1c105               | rol                 ecx, 5
            //   81e700ff00ff         | and                 edi, 0xff00ff00
            //   0bf8                 | or                  edi, eax
            //   8bc6                 | mov                 eax, esi
            //   33c3                 | xor                 eax, ebx
            //   897dc4               | mov                 dword ptr [ebp - 0x3c], edi

        $sequence_5 = { 83c1fc e8???????? 8b4dfc 8d4608 50 e8???????? 8b4dfc }
            // n = 7, score = 400
            //   83c1fc               | add                 ecx, -4
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8d4608               | lea                 eax, [esi + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_6 = { 56 8bf1 ff15???????? 8d8ed8010000 e8???????? 8d4e30 e8???????? }
            // n = 7, score = 400
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   ff15????????         |                     
            //   8d8ed8010000         | lea                 ecx, [esi + 0x1d8]
            //   e8????????           |                     
            //   8d4e30               | lea                 ecx, [esi + 0x30]
            //   e8????????           |                     

        $sequence_7 = { 8b7d08 6a00 ff7708 8b4f04 50 e8???????? }
            // n = 6, score = 400
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   6a00                 | push                0
            //   ff7708               | push                dword ptr [edi + 8]
            //   8b4f04               | mov                 ecx, dword ptr [edi + 4]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 8b4dd8 e8???????? 8b7df0 8365d800 47 897df0 3b7dd0 }
            // n = 7, score = 400
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   e8????????           |                     
            //   8b7df0               | mov                 edi, dword ptr [ebp - 0x10]
            //   8365d800             | and                 dword ptr [ebp - 0x28], 0
            //   47                   | inc                 edi
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   3b7dd0               | cmp                 edi, dword ptr [ebp - 0x30]

        $sequence_9 = { 56 8b35???????? ffd6 53 ffd6 8bc7 5b }
            // n = 7, score = 400
            //   56                   | push                esi
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   8bc7                 | mov                 eax, edi
            //   5b                   | pop                 ebx

    condition:
        7 of them and filesize < 237568
}