rule win_murkytop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 68???????? e8???????? 83c410 68???????? ff15???????? 5f }
            // n = 6, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   68????????           |                     
            //   ff15????????         |                     
            //   5f                   | pop                 edi

        $sequence_1 = { ff15???????? 81feea000000 0f843affffff 57 ff15???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   81feea000000         | cmp                 esi, 0xea
            //   0f843affffff         | je                  0xffffff40
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_2 = { 3b7df8 72e0 8b45f4 3bc6 7407 }
            // n = 5, score = 100
            //   3b7df8               | cmp                 edi, dword ptr [ebp - 8]
            //   72e0                 | jb                  0xffffffe2
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   3bc6                 | cmp                 eax, esi
            //   7407                 | je                  9

        $sequence_3 = { 895df0 895de8 e8???????? 83c40c 8d95d0feffff 52 }
            // n = 6, score = 100
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d95d0feffff         | lea                 edx, [ebp - 0x130]
            //   52                   | push                edx

        $sequence_4 = { 0fb6f3 0bce 8bd8 c1fb10 0fb6f3 66c1e608 }
            // n = 6, score = 100
            //   0fb6f3               | movzx               esi, bl
            //   0bce                 | or                  ecx, esi
            //   8bd8                 | mov                 ebx, eax
            //   c1fb10               | sar                 ebx, 0x10
            //   0fb6f3               | movzx               esi, bl
            //   66c1e608             | shl                 si, 8

        $sequence_5 = { 0f8485000000 3c76 747b 3c56 }
            // n = 4, score = 100
            //   0f8485000000         | je                  0x8b
            //   3c76                 | cmp                 al, 0x76
            //   747b                 | je                  0x7d
            //   3c56                 | cmp                 al, 0x56

        $sequence_6 = { 8bc1 c1e004 2bc1 8d0c87 69c960ea0000 53 894de0 }
            // n = 7, score = 100
            //   8bc1                 | mov                 eax, ecx
            //   c1e004               | shl                 eax, 4
            //   2bc1                 | sub                 eax, ecx
            //   8d0c87               | lea                 ecx, [edi + eax*4]
            //   69c960ea0000         | imul                ecx, ecx, 0xea60
            //   53                   | push                ebx
            //   894de0               | mov                 dword ptr [ebp - 0x20], ecx

        $sequence_7 = { e8???????? 83c410 8937 8b7f04 3bfe }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8937                 | mov                 dword ptr [edi], esi
            //   8b7f04               | mov                 edi, dword ptr [edi + 4]
            //   3bfe                 | cmp                 edi, esi

        $sequence_8 = { 0fb6ca 0fbe8960cf4100 85c9 750d e8???????? c7002a000000 eb7a }
            // n = 7, score = 100
            //   0fb6ca               | movzx               ecx, dl
            //   0fbe8960cf4100       | movsx               ecx, byte ptr [ecx + 0x41cf60]
            //   85c9                 | test                ecx, ecx
            //   750d                 | jne                 0xf
            //   e8????????           |                     
            //   c7002a000000         | mov                 dword ptr [eax], 0x2a
            //   eb7a                 | jmp                 0x7c

        $sequence_9 = { 6a00 6a00 68???????? 8b45c8 50 ffd7 3dea000000 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   3dea000000           | cmp                 eax, 0xea

    condition:
        7 of them and filesize < 294912
}