rule win_skyplex_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.skyplex."
        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.skyplex"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 e8???????? 83c408 85c0 7430 68???????? }
            // n = 6, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7430                 | je                  0x32
            //   68????????           |                     

        $sequence_1 = { 68???????? 8d9538f7ffff 52 e8???????? 83c408 85c0 0f8490000000 }
            // n = 7, score = 100
            //   68????????           |                     
            //   8d9538f7ffff         | lea                 edx, [ebp - 0x8c8]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   0f8490000000         | je                  0x96

        $sequence_2 = { 8d45fc 50 8d8d30ffffff 51 ff15???????? 8d9530ffffff 52 }
            // n = 7, score = 100
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   8d8d30ffffff         | lea                 ecx, [ebp - 0xd0]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8d9530ffffff         | lea                 edx, [ebp - 0xd0]
            //   52                   | push                edx

        $sequence_3 = { 85c0 0f85d0000000 68???????? 8d85b0f9ffff 50 e8???????? }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f85d0000000         | jne                 0xd6
            //   68????????           |                     
            //   8d85b0f9ffff         | lea                 eax, [ebp - 0x650]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 89430c 8d4310 8d89649c4100 5a 668b31 }
            // n = 5, score = 100
            //   89430c               | mov                 dword ptr [ebx + 0xc], eax
            //   8d4310               | lea                 eax, [ebx + 0x10]
            //   8d89649c4100         | lea                 ecx, [ecx + 0x419c64]
            //   5a                   | pop                 edx
            //   668b31               | mov                 si, word ptr [ecx]

        $sequence_5 = { 8d95b0f9ffff 52 e8???????? 83c408 85c0 }
            // n = 5, score = 100
            //   8d95b0f9ffff         | lea                 edx, [ebp - 0x650]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_6 = { 83c201 88953ff6ffff 8d8d38f6ffff e8???????? 0fb6853ff6ffff }
            // n = 5, score = 100
            //   83c201               | add                 edx, 1
            //   88953ff6ffff         | mov                 byte ptr [ebp - 0x9c1], dl
            //   8d8d38f6ffff         | lea                 ecx, [ebp - 0x9c8]
            //   e8????????           |                     
            //   0fb6853ff6ffff       | movzx               eax, byte ptr [ebp - 0x9c1]

        $sequence_7 = { 752b e8???????? 0fb6d0 85d2 }
            // n = 4, score = 100
            //   752b                 | jne                 0x2d
            //   e8????????           |                     
            //   0fb6d0               | movzx               edx, al
            //   85d2                 | test                edx, edx

        $sequence_8 = { 8b36 8bce c1f905 8b0c8dc0af4100 83e61f c1e606 89040e }
            // n = 7, score = 100
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   8bce                 | mov                 ecx, esi
            //   c1f905               | sar                 ecx, 5
            //   8b0c8dc0af4100       | mov                 ecx, dword ptr [ecx*4 + 0x41afc0]
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   89040e               | mov                 dword ptr [esi + ecx], eax

        $sequence_9 = { c7851cf7ffff04000000 c78520f7ffffb0454100 c78524f7ffffe8454100 c78528f7ffff30464100 c7852cf7ffff80464100 }
            // n = 5, score = 100
            //   c7851cf7ffff04000000     | mov    dword ptr [ebp - 0x8e4], 4
            //   c78520f7ffffb0454100     | mov    dword ptr [ebp - 0x8e0], 0x4145b0
            //   c78524f7ffffe8454100     | mov    dword ptr [ebp - 0x8dc], 0x4145e8
            //   c78528f7ffff30464100     | mov    dword ptr [ebp - 0x8d8], 0x414630
            //   c7852cf7ffff80464100     | mov    dword ptr [ebp - 0x8d4], 0x414680

    condition:
        7 of them and filesize < 262144
}