rule win_op_blockbuster_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.op_blockbuster."
        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.op_blockbuster"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 6a00 e8???????? 85c0 7407 83f802 }
            // n = 5, score = 1100
            //   6a00                 | stosb               byte ptr es:[edi], al
            //   e8????????           |                     
            //   85c0                 | pop                 edi
            //   7407                 | test                esi, esi
            //   83f802               | mov                 cl, byte ptr [eax]

        $sequence_1 = { c701???????? 8b497c 85c9 7407 }
            // n = 4, score = 1100
            //   c701????????         |                     
            //   8b497c               | add                 eax, 0x21
            //   85c9                 | jmp                 0xc
            //   7407                 | push                0x4008

        $sequence_2 = { e8???????? 6800400000 6a00 ff15???????? }
            // n = 4, score = 1100
            //   e8????????           |                     
            //   6800400000           | cmp                 al, 0x70
            //   6a00                 | jg                  8
            //   ff15????????         |                     

        $sequence_3 = { ff15???????? 6808400000 6a40 ff15???????? }
            // n = 4, score = 1100
            //   ff15????????         |                     
            //   6808400000           | jg                  8
            //   6a40                 | add                 al, 9
            //   ff15????????         |                     

        $sequence_4 = { 56 57 683c400000 6a40 }
            // n = 4, score = 1100
            //   56                   | add                 al, 9
            //   57                   | jmp                 0xe
            //   683c400000           | cmp                 al, 0x72
            //   6a40                 | jl                  0xa

        $sequence_5 = { 66ab aa 5f 85f6 }
            // n = 4, score = 1100
            //   66ab                 | cmp                 al, 0x70
            //   aa                   | jg                  8
            //   5f                   | add                 al, 9
            //   85f6                 | cmp                 al, 0x70

        $sequence_6 = { 8a08 80f920 7505 83c021 eb05 }
            // n = 5, score = 1100
            //   8a08                 | jg                  6
            //   80f920               | add                 al, 9
            //   7505                 | jmp                 0xc
            //   83c021               | jl                  0xa
            //   eb05                 | cmp                 al, 0x70

        $sequence_7 = { 68???????? 56 ff15???????? 68???????? 56 a3???????? e8???????? }
            // n = 7, score = 1000
            //   68????????           |                     
            //   56                   | stosw               word ptr es:[edi], ax
            //   ff15????????         |                     
            //   68????????           |                     
            //   56                   | stosb               byte ptr es:[edi], al
            //   a3????????           |                     
            //   e8????????           |                     

        $sequence_8 = { 68???????? ff15???????? 85c0 7412 68???????? 50 e8???????? }
            // n = 7, score = 1000
            //   68????????           |                     
            //   ff15????????         |                     
            //   85c0                 | pop                 edi
            //   7412                 | test                esi, esi
            //   68????????           |                     
            //   50                   | pop                 esi
            //   e8????????           |                     

        $sequence_9 = { 56 50 8d45fc 6a04 50 57 }
            // n = 6, score = 1000
            //   56                   | push                esi
            //   50                   | push                edi
            //   8d45fc               | push                0x403c
            //   6a04                 | push                0x40
            //   50                   | push                esi
            //   57                   | push                esi

        $sequence_10 = { 3c70 7f04 0409 eb06 3c72 }
            // n = 5, score = 500
            //   3c70                 | cmp                 al, 0x70
            //   7f04                 | jg                  6
            //   0409                 | add                 al, 9
            //   eb06                 | jmp                 8
            //   3c72                 | cmp                 al, 0x72

        $sequence_11 = { 3c69 7c08 3c70 7f04 }
            // n = 4, score = 500
            //   3c69                 | cmp                 al, 0x69
            //   7c08                 | jl                  0xa
            //   3c70                 | cmp                 al, 0x70
            //   7f04                 | jg                  6

        $sequence_12 = { 85c0 0f84bf000000 440fb7442430 488d942450010000 4c8bcf 488bcb }
            // n = 6, score = 300
            //   85c0                 | dec                 eax
            //   0f84bf000000         | mov                 dword ptr [esp + 0x48], eax
            //   440fb7442430         | dec                 esp
            //   488d942450010000     | mov                 dword ptr [esp + 0x40], esp
            //   4c8bcf               | dec                 esp
            //   488bcb               | mov                 dword ptr [esp + 0x38], esp

        $sequence_13 = { 8b442450 33db 48895c2430 89442428 }
            // n = 4, score = 300
            //   8b442450             | inc                 esp
            //   33db                 | mov                 ebp, esi
            //   48895c2430           | mov                 edi, 2
            //   89442428             | cmp                 esi, ecx

        $sequence_14 = { 4889442448 4c89642440 4c89642438 4489642430 4533c9 33d2 4489642428 }
            // n = 7, score = 300
            //   4889442448           | inc                 esp
            //   4c89642440           | cmovg               ebp, ecx
            //   4c89642438           | mov                 eax, dword ptr [esp + 0x50]
            //   4489642430           | xor                 ebx, ebx
            //   4533c9               | dec                 eax
            //   33d2                 | mov                 dword ptr [esp + 0x30], ebx
            //   4489642428           | mov                 dword ptr [esp + 0x28], eax

        $sequence_15 = { a3???????? 5e c3 68???????? ff15???????? 85c0 }
            // n = 6, score = 300
            //   a3????????           |                     
            //   5e                   | push                esi
            //   c3                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   85c0                 | lea                 eax, [ebp - 4]

        $sequence_16 = { ff15???????? 4c8bf0 4885c0 0f84b9000000 4883c008 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   4c8bf0               | dec                 esp
            //   4885c0               | mov                 esi, eax
            //   0f84b9000000         | dec                 eax
            //   4883c008             | test                eax, eax

        $sequence_17 = { 4883c008 b900400000 448bee bf02000000 3bf1 440f4fe9 }
            // n = 6, score = 300
            //   4883c008             | je                  0xbf
            //   b900400000           | dec                 eax
            //   448bee               | add                 eax, 8
            //   bf02000000           | dec                 eax
            //   3bf1                 | add                 eax, 8
            //   440f4fe9             | mov                 ecx, 0x4000

        $sequence_18 = { 488bfa 4533c9 ba7a341200 4d8be8 4c8be1 e8???????? }
            // n = 6, score = 300
            //   488bfa               | inc                 esp
            //   4533c9               | mov                 dword ptr [esp + 0x30], esp
            //   ba7a341200           | inc                 ebp
            //   4d8be8               | xor                 ecx, ecx
            //   4c8be1               | xor                 edx, edx
            //   e8????????           |                     

        $sequence_19 = { 56 50 e8???????? ff75f4 e8???????? ff75ec e8???????? }
            // n = 7, score = 100
            //   56                   | lea                 eax, [ebp - 4]
            //   50                   | push                4
            //   e8????????           |                     
            //   ff75f4               | push                eax
            //   e8????????           |                     
            //   ff75ec               | push                edi
            //   e8????????           |                     

        $sequence_20 = { 53 68???????? ffd6 3bc3 7518 53 }
            // n = 6, score = 100
            //   53                   | push                eax
            //   68????????           |                     
            //   ffd6                 | lea                 eax, [ebp - 4]
            //   3bc3                 | push                4
            //   7518                 | push                eax
            //   53                   | push                edi

        $sequence_21 = { 5e 5d c3 55 8bec 81ecec0d0000 53 }
            // n = 7, score = 100
            //   5e                   | je                  0x14
            //   5d                   | push                eax
            //   c3                   | pop                 esi
            //   55                   | ret                 
            //   8bec                 | test                eax, eax
            //   81ecec0d0000         | pop                 esi
            //   53                   | ret                 

    condition:
        7 of them and filesize < 74309632
}