rule win_ployx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.ployx."
        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.ployx"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 56 e8???????? 83c410 8d45ec 8d7508 50 83ec20 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d45ec               | lea                 eax, dword ptr [ebp - 0x14]
            //   8d7508               | lea                 esi, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   83ec20               | sub                 esp, 0x20

        $sequence_1 = { e8???????? bf???????? 8d45fc 57 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   bf????????           |                     
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]
            //   57                   | push                edi

        $sequence_2 = { 3bc7 59 894604 7507 6a01 }
            // n = 5, score = 100
            //   3bc7                 | cmp                 eax, edi
            //   59                   | pop                 ecx
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   7507                 | jne                 9
            //   6a01                 | push                1

        $sequence_3 = { 8b4508 c1f805 8d1c85007d2700 8b4508 83e01f 8d34c0 8b03 }
            // n = 7, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   c1f805               | sar                 eax, 5
            //   8d1c85007d2700       | lea                 ebx, dword ptr [eax*4 + 0x277d00]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83e01f               | and                 eax, 0x1f
            //   8d34c0               | lea                 esi, dword ptr [eax + eax*8]
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_4 = { 8b7e0c 8b0490 2bf9 c1e814 c1ef0c 0fafc7 03c1 }
            // n = 7, score = 100
            //   8b7e0c               | mov                 edi, dword ptr [esi + 0xc]
            //   8b0490               | mov                 eax, dword ptr [eax + edx*4]
            //   2bf9                 | sub                 edi, ecx
            //   c1e814               | shr                 eax, 0x14
            //   c1ef0c               | shr                 edi, 0xc
            //   0fafc7               | imul                eax, edi
            //   03c1                 | add                 eax, ecx

        $sequence_5 = { 8bd8 e8???????? 59 8945f8 59 8bc6 2bc7 }
            // n = 7, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   59                   | pop                 ecx
            //   8bc6                 | mov                 eax, esi
            //   2bc7                 | sub                 eax, edi

        $sequence_6 = { 50 e8???????? 50 e8???????? 8bd8 895dfc 8d7b04 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   8d7b04               | lea                 edi, dword ptr [ebx + 4]

        $sequence_7 = { 8945ec 0f8438010000 80a5e8fcffff00 6a3f 59 33c0 }
            // n = 6, score = 100
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   0f8438010000         | je                  0x13e
            //   80a5e8fcffff00       | and                 byte ptr [ebp - 0x318], 0
            //   6a3f                 | push                0x3f
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { 8945f8 ff75f4 50 e8???????? ff75f4 e8???????? 83c41c }
            // n = 7, score = 100
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   50                   | push                eax
            //   e8????????           |                     
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_9 = { 884dfc 80e20f 8acb 80e33f c0e202 c0e906 0ad1 }
            // n = 7, score = 100
            //   884dfc               | mov                 byte ptr [ebp - 4], cl
            //   80e20f               | and                 dl, 0xf
            //   8acb                 | mov                 cl, bl
            //   80e33f               | and                 bl, 0x3f
            //   c0e202               | shl                 dl, 2
            //   c0e906               | shr                 cl, 6
            //   0ad1                 | or                  dl, cl

    condition:
        7 of them and filesize < 229376
}