rule win_ave_maria_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        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 = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 895e04 e9???????? 6a0c 59 e8???????? 8bf0 85f6 }
            // n = 7, score = 400
            //   895e04               | mov                 dword ptr [esi + 4], ebx
            //   e9????????           |                     
            //   6a0c                 | push                0xc
            //   59                   | pop                 ecx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi

        $sequence_1 = { 83660400 8d4e0c e8???????? 832600 8bc6 }
            // n = 5, score = 400
            //   83660400             | and                 dword ptr [esi + 4], 0
            //   8d4e0c               | lea                 ecx, [esi + 0xc]
            //   e8????????           |                     
            //   832600               | and                 dword ptr [esi], 0
            //   8bc6                 | mov                 eax, esi

        $sequence_2 = { e9???????? 51 ff7204 51 e8???????? 59 c3 }
            // n = 7, score = 400
            //   e9????????           |                     
            //   51                   | push                ecx
            //   ff7204               | push                dword ptr [edx + 4]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c3                   | ret                 

        $sequence_3 = { 8b12 e8???????? 59 6a14 8d45e8 8bce 50 }
            // n = 7, score = 400
            //   8b12                 | mov                 edx, dword ptr [edx]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   6a14                 | push                0x14
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   8bce                 | mov                 ecx, esi
            //   50                   | push                eax

        $sequence_4 = { 51 68???????? 8d4df8 e8???????? 68???????? 8d4dfc e8???????? }
            // n = 7, score = 400
            //   51                   | push                ecx
            //   68????????           |                     
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     
            //   68????????           |                     
            //   8d4dfc               | lea                 ecx, [ebp - 4]
            //   e8????????           |                     

        $sequence_5 = { 751f 85c0 7413 6810200000 68???????? 68???????? 6a00 }
            // n = 7, score = 400
            //   751f                 | jne                 0x21
            //   85c0                 | test                eax, eax
            //   7413                 | je                  0x15
            //   6810200000           | push                0x2010
            //   68????????           |                     
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_6 = { ff507c 8b45e4 59 ff5064 8d4dd0 e8???????? 8d8d4cffffff }
            // n = 7, score = 400
            //   ff507c               | call                dword ptr [eax + 0x7c]
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   59                   | pop                 ecx
            //   ff5064               | call                dword ptr [eax + 0x64]
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   e8????????           |                     
            //   8d8d4cffffff         | lea                 ecx, [ebp - 0xb4]

        $sequence_7 = { 8b75f8 03c1 8b4dbc 8bd0 334df0 334dd4 334db0 }
            // n = 7, score = 400
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   03c1                 | add                 eax, ecx
            //   8b4dbc               | mov                 ecx, dword ptr [ebp - 0x44]
            //   8bd0                 | mov                 edx, eax
            //   334df0               | xor                 ecx, dword ptr [ebp - 0x10]
            //   334dd4               | xor                 ecx, dword ptr [ebp - 0x2c]
            //   334db0               | xor                 ecx, dword ptr [ebp - 0x50]

        $sequence_8 = { 23de d1c0 0bcb 03c8 8945f0 034dec }
            // n = 6, score = 400
            //   23de                 | and                 ebx, esi
            //   d1c0                 | rol                 eax, 1
            //   0bcb                 | or                  ecx, ebx
            //   03c8                 | add                 ecx, eax
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   034dec               | add                 ecx, dword ptr [ebp - 0x14]

        $sequence_9 = { 8d4c2430 e8???????? 85c0 7418 51 8d442414 50 }
            // n = 7, score = 400
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7418                 | je                  0x1a
            //   51                   | push                ecx
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 237568
}