rule win_ave_maria_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { 52 6a01 8b08 50 ff510c 85c0 74db }
            // n = 7, score = 400
            //   52                   | push                edx
            //   6a01                 | push                1
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   50                   | push                eax
            //   ff510c               | call                dword ptr [ecx + 0xc]
            //   85c0                 | test                eax, eax
            //   74db                 | je                  0xffffffdd

        $sequence_1 = { 72bf 83fe28 7656 83fe2e 7451 ebb3 81feb3000000 }
            // n = 7, score = 400
            //   72bf                 | jb                  0xffffffc1
            //   83fe28               | cmp                 esi, 0x28
            //   7656                 | jbe                 0x58
            //   83fe2e               | cmp                 esi, 0x2e
            //   7451                 | je                  0x53
            //   ebb3                 | jmp                 0xffffffb5
            //   81feb3000000         | cmp                 esi, 0xb3

        $sequence_2 = { 8bd9 57 6a05 58 6a14 33ff 89460c }
            // n = 7, score = 400
            //   8bd9                 | mov                 ebx, ecx
            //   57                   | push                edi
            //   6a05                 | push                5
            //   58                   | pop                 eax
            //   6a14                 | push                0x14
            //   33ff                 | xor                 edi, edi
            //   89460c               | mov                 dword ptr [esi + 0xc], eax

        $sequence_3 = { c9 c3 3c02 7408 3c03 0f859a000000 83bde8feffff05 }
            // n = 7, score = 400
            //   c9                   | leave               
            //   c3                   | ret                 
            //   3c02                 | cmp                 al, 2
            //   7408                 | je                  0xa
            //   3c03                 | cmp                 al, 3
            //   0f859a000000         | jne                 0xa0
            //   83bde8feffff05       | cmp                 dword ptr [ebp - 0x118], 5

        $sequence_4 = { 741c e8???????? 8906 8bc8 ff7704 8b17 }
            // n = 6, score = 400
            //   741c                 | je                  0x1e
            //   e8????????           |                     
            //   8906                 | mov                 dword ptr [esi], eax
            //   8bc8                 | mov                 ecx, eax
            //   ff7704               | push                dword ptr [edi + 4]
            //   8b17                 | mov                 edx, dword ptr [edi]

        $sequence_5 = { 85c0 7507 68???????? eb1c 8d45fc 50 56 }
            // n = 7, score = 400
            //   85c0                 | test                eax, eax
            //   7507                 | jne                 9
            //   68????????           |                     
            //   eb1c                 | jmp                 0x1e
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_6 = { 55 8bec 56 57 8b7d08 832700 83670400 }
            // n = 7, score = 400
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   832700               | and                 dword ptr [edi], 0
            //   83670400             | and                 dword ptr [edi + 4], 0

        $sequence_7 = { 50 ff510c 85c0 0f8437ffffff 8b4dfc 85c9 7409 }
            // n = 7, score = 400
            //   50                   | push                eax
            //   ff510c               | call                dword ptr [ecx + 0xc]
            //   85c0                 | test                eax, eax
            //   0f8437ffffff         | je                  0xffffff3d
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   85c9                 | test                ecx, ecx
            //   7409                 | je                  0xb

        $sequence_8 = { ff7510 03550c 8bcf e8???????? 8b7508 83c404 8bce }
            // n = 7, score = 400
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   03550c               | add                 edx, dword ptr [ebp + 0xc]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   83c404               | add                 esp, 4
            //   8bce                 | mov                 ecx, esi

        $sequence_9 = { c1c105 33c2 c1cf02 33c6 81c2d6c162ca 05d6c162ca 0345d0 }
            // n = 7, score = 400
            //   c1c105               | rol                 ecx, 5
            //   33c2                 | xor                 eax, edx
            //   c1cf02               | ror                 edi, 2
            //   33c6                 | xor                 eax, esi
            //   81c2d6c162ca         | add                 edx, 0xca62c1d6
            //   05d6c162ca           | add                 eax, 0xca62c1d6
            //   0345d0               | add                 eax, dword ptr [ebp - 0x30]

    condition:
        7 of them and filesize < 237568
}