rule win_murkytop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.murkytop."
        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.murkytop"
        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 = { ffd6 8b4dec 51 ffd6 5f 5e }
            // n = 6, score = 100
            //   ffd6                 | call                esi
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_1 = { 3dea000000 7544 68???????? e8???????? }
            // n = 4, score = 100
            //   3dea000000           | cmp                 eax, 0xea
            //   7544                 | jne                 0x46
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_2 = { 50 68???????? e8???????? 83c408 83ff06 7c3d 8b4614 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   83ff06               | cmp                 edi, 6
            //   7c3d                 | jl                  0x3f
            //   8b4614               | mov                 eax, dword ptr [esi + 0x14]

        $sequence_3 = { e8???????? 47 3b7d08 0f8c55ffffff 83fb05 7511 6a01 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   47                   | inc                 edi
            //   3b7d08               | cmp                 edi, dword ptr [ebp + 8]
            //   0f8c55ffffff         | jl                  0xffffff5b
            //   83fb05               | cmp                 ebx, 5
            //   7511                 | jne                 0x13
            //   6a01                 | push                1

        $sequence_4 = { 33ff 56 e8???????? 8bc6 c1f805 8b0485e0f54100 83e61f }
            // n = 7, score = 100
            //   33ff                 | xor                 edi, edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   c1f805               | sar                 eax, 5
            //   8b0485e0f54100       | mov                 eax, dword ptr [eax*4 + 0x41f5e0]
            //   83e61f               | and                 esi, 0x1f

        $sequence_5 = { 51 e8???????? 83c404 8945e8 c645ff01 eb17 395dec }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   c645ff01             | mov                 byte ptr [ebp - 1], 1
            //   eb17                 | jmp                 0x19
            //   395dec               | cmp                 dword ptr [ebp - 0x14], ebx

        $sequence_6 = { 6a01 51 ff15???????? 3bc6 743f 50 ff15???????? }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   3bc6                 | cmp                 eax, esi
            //   743f                 | je                  0x41
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_7 = { 51 ff15???????? 85c0 7405 395df4 7541 ff15???????? }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   395df4               | cmp                 dword ptr [ebp - 0xc], ebx
            //   7541                 | jne                 0x43
            //   ff15????????         |                     

        $sequence_8 = { eb08 8b4608 e8???????? 47 3b7d08 0f8c55ffffff 83fb05 }
            // n = 7, score = 100
            //   eb08                 | jmp                 0xa
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   e8????????           |                     
            //   47                   | inc                 edi
            //   3b7d08               | cmp                 edi, dword ptr [ebp + 8]
            //   0f8c55ffffff         | jl                  0xffffff5b
            //   83fb05               | cmp                 ebx, 5

        $sequence_9 = { 3dfeffff3f 0f87d6020000 2bce 40 c1f902 }
            // n = 5, score = 100
            //   3dfeffff3f           | cmp                 eax, 0x3ffffffe
            //   0f87d6020000         | ja                  0x2dc
            //   2bce                 | sub                 ecx, esi
            //   40                   | inc                 eax
            //   c1f902               | sar                 ecx, 2

    condition:
        7 of them and filesize < 294912
}