rule win_grateful_pos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.grateful_pos."
        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.grateful_pos"
        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 = { 7407 b8f6ffffff eb02 33c0 }
            // n = 4, score = 600
            //   7407                 | je                  9
            //   b8f6ffffff           | mov                 eax, 0xfffffff6
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 83f801 7510 e8???????? e8???????? }
            // n = 4, score = 600
            //   83f801               | cmp                 eax, 1
            //   7510                 | jne                 0x12
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_2 = { eb07 b8fcffffff eb02 33c0 }
            // n = 4, score = 600
            //   eb07                 | jmp                 9
            //   b8fcffffff           | mov                 eax, 0xfffffffc
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { e8???????? 99 b980ee3600 f7f9 }
            // n = 4, score = 600
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b980ee3600           | mov                 ecx, 0x36ee80
            //   f7f9                 | idiv                ecx

        $sequence_4 = { b8fdffffff eb13 b8fcffffff eb0c }
            // n = 4, score = 600
            //   b8fdffffff           | mov                 eax, 0xfffffffd
            //   eb13                 | jmp                 0x15
            //   b8fcffffff           | mov                 eax, 0xfffffffc
            //   eb0c                 | jmp                 0xe

        $sequence_5 = { b8feffffff eb1a b8fdffffff eb13 }
            // n = 4, score = 600
            //   b8feffffff           | mov                 eax, 0xfffffffe
            //   eb1a                 | jmp                 0x1c
            //   b8fdffffff           | mov                 eax, 0xfffffffd
            //   eb13                 | jmp                 0x15

        $sequence_6 = { 7411 e8???????? e8???????? 33c0 e9???????? }
            // n = 5, score = 600
            //   7411                 | je                  0x13
            //   e8????????           |                     
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_7 = { 83c40c c785c8fbffff00000000 c785b4fbffff00000000 c785dcfbffff00000000 eb0f 8b85dcfbffff 83c001 }
            // n = 7, score = 500
            //   83c40c               | mov                 edx, dword ptr [ebp - 0x20008]
            //   c785c8fbffff00000000     | movzx    eax, byte ptr [ebp + edx - 0x20005]
            //   c785b4fbffff00000000     | cmp    eax, 0x30
            //   c785dcfbffff00000000     | jl    0x7a
            //   eb0f                 | add                 esp, 0xc
            //   8b85dcfbffff         | mov                 dword ptr [ebp - 0x438], 0
            //   83c001               | mov                 dword ptr [ebp - 0x44c], 0

        $sequence_8 = { 6a02 8b0d???????? 8b550c 8d044a 50 e8???????? 83c410 }
            // n = 7, score = 500
            //   6a02                 | mov                 dword ptr [ebp - 0x430], eax
            //   8b0d????????         |                     
            //   8b550c               | jle                 0xf
            //   8d044a               | push                0x2710
            //   50                   | add                 esp, 4
            //   e8????????           |                     
            //   83c410               | push                2

        $sequence_9 = { 52 e8???????? 83c404 0385d0fbffff 8985d0fbffff }
            // n = 5, score = 500
            //   52                   | mov                 eax, dword ptr [ebp - 0x20008]
            //   e8????????           |                     
            //   83c404               | movzx               ecx, byte ptr [ebp + eax - 0x20003]
            //   0385d0fbffff         | test                ecx, ecx
            //   8985d0fbffff         | jne                 0x31

        $sequence_10 = { 8d8574ffffff 50 e8???????? 83c40c 6a14 8d8d74fdffff }
            // n = 6, score = 500
            //   8d8574ffffff         | lea                 eax, [ebp - 0x8c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a14                 | push                0x14
            //   8d8d74fdffff         | lea                 ecx, [ebp - 0x28c]

        $sequence_11 = { 0fb6940dfbfffdff 85d2 7541 8b85f8fffdff 0fb68c05fdfffdff 85c9 752f }
            // n = 7, score = 500
            //   0fb6940dfbfffdff     | lea                 ecx, [ebp - 0x28c]
            //   85d2                 | push                ecx
            //   7541                 | lea                 edx, [ebp - 0x78]
            //   8b85f8fffdff         | push                edx
            //   0fb68c05fdfffdff     | movzx               edx, byte ptr [ebp + ecx - 0x20005]
            //   85c9                 | test                edx, edx
            //   752f                 | jne                 0x45

        $sequence_12 = { 833d????????00 745a 6a28 8d9574ffffff 52 a1???????? }
            // n = 6, score = 500
            //   833d????????00       |                     
            //   745a                 | mov                 dword ptr [ebp - 0x424], 0
            //   6a28                 | jmp                 0x1b
            //   8d9574ffffff         | mov                 eax, dword ptr [ebp - 0x424]
            //   52                   | add                 eax, 1
            //   a1????????           |                     

        $sequence_13 = { e9???????? 8b95f8fffdff 0fb68415fbfffdff 83f830 7c6d }
            // n = 5, score = 500
            //   e9????????           |                     
            //   8b95f8fffdff         | mov                 edx, dword ptr [ebp + 0xc]
            //   0fb68415fbfffdff     | lea                 eax, [edx + ecx*2]
            //   83f830               | push                eax
            //   7c6d                 | add                 esp, 0x10

        $sequence_14 = { 833d????????00 7e0d 6810270000 e8???????? 83c404 }
            // n = 5, score = 500
            //   833d????????00       |                     
            //   7e0d                 | push                edx
            //   6810270000           | add                 esp, 4
            //   e8????????           |                     
            //   83c404               | add                 eax, dword ptr [ebp - 0x430]

        $sequence_15 = { 888424b2000000 b801000000 486bc003 488d0da4c70100 0fbe0401 83f04d 888424b3000000 }
            // n = 7, score = 200
            //   888424b2000000       | mov                 byte ptr [esp + 0xb2], al
            //   b801000000           | mov                 eax, 1
            //   486bc003             | dec                 eax
            //   488d0da4c70100       | imul                eax, eax, 3
            //   0fbe0401             | dec                 eax
            //   83f04d               | lea                 ecx, [0x1c7a4]
            //   888424b3000000       | movsx               eax, byte ptr [ecx + eax]

    condition:
        7 of them and filesize < 3964928
}