rule win_lowkey_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.lowkey."
        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.lowkey"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 498b9cf7a09c0400 4885db 7407 483bdf 747a }
            // n = 5, score = 100
            //   498b9cf7a09c0400     | lea                 ecx, dword ptr [0x131be]
            //   4885db               | mov                 ebx, edx
            //   7407                 | dec                 esp
            //   483bdf               | lea                 eax, dword ptr [0x131ad]
            //   747a                 | dec                 eax

        $sequence_1 = { 6666660f1f840000000000 803077 488d4001 4883e901 75f3 33d2 c784243001000043726561 }
            // n = 7, score = 100
            //   6666660f1f840000000000     | jl    0x13ef
            //   803077               | dec                 ecx
            //   488d4001             | mov                 ecx, esi
            //   4883e901             | add                 eax, eax
            //   75f3                 | sub                 ecx, eax
            //   33d2                 | je                  0x152f
            //   c784243001000043726561     | lea    eax, dword ptr [ecx - 1]

        $sequence_2 = { b808000000 486bc000 488d0d322d0400 48c7040102000000 b808000000 }
            // n = 5, score = 100
            //   b808000000           | dec                 eax
            //   486bc000             | mov                 ecx, edi
            //   488d0d322d0400       | dec                 ecx
            //   48c7040102000000     | mov                 edi, esi
            //   b808000000           | mov                 edx, dword ptr [esp + 0x44]

        $sequence_3 = { 488b4c2430 85c0 0f94c3 ff15???????? 8bc3 488b4c2448 }
            // n = 6, score = 100
            //   488b4c2430           | mov                 ecx, dword ptr [esi + 0x10]
            //   85c0                 | inc                 ecx
            //   0f94c3               | sub                 ebp, edi
            //   ff15????????         |                     
            //   8bc3                 | mov                 eax, dword ptr [esi + 0x20]
            //   488b4c2448           | dec                 edx

        $sequence_4 = { 33c0 488b8d60460000 4833cc e8???????? 4881c470470000 415e }
            // n = 6, score = 100
            //   33c0                 | test                eax, eax
            //   488b8d60460000       | dec                 esp
            //   4833cc               | lea                 eax, dword ptr [0xffffe744]
            //   e8????????           |                     
            //   4881c470470000       | xor                 edx, edx
            //   415e                 | xor                 ecx, ecx

        $sequence_5 = { 740a 413a84196cf00100 7542 48ff4210 488b4210 4c394208 7406 }
            // n = 7, score = 100
            //   740a                 | dec                 eax
            //   413a84196cf00100     | lea                 ecx, dword ptr [esp + 0x70]
            //   7542                 | dec                 esp
            //   48ff4210             | mov                 dword ptr [esp + 0x21c0], ebp
            //   488b4210             | je                  0x1ed6
            //   4c394208             | jmp                 0x1d1a
            //   7406                 | inc                 cx

        $sequence_6 = { e8???????? 33ff 4c8d4c2420 4c8d442440 897c2420 488d1561090200 488bcb }
            // n = 7, score = 100
            //   e8????????           |                     
            //   33ff                 | dec                 eax
            //   4c8d4c2420           | lea                 ecx, dword ptr [edi + 0x50]
            //   4c8d442440           | dec                 eax
            //   897c2420             | lea                 ecx, dword ptr [edi + 0x28]
            //   488d1561090200       | dec                 eax
            //   488bcb               | mov                 dword ptr [ebx], eax

        $sequence_7 = { 7561 4533c0 66448964243d 488d542438 4489742440 e8???????? 488b15???????? }
            // n = 7, score = 100
            //   7561                 | dec                 esp
            //   4533c0               | lea                 edi, dword ptr [0xfffec386]
            //   66448964243d         | dec                 ebp
            //   488d542438           | mov                 esp, ecx
            //   4489742440           | inc                 ecx
            //   e8????????           |                     
            //   488b15????????       |                     

        $sequence_8 = { 488d15de63feff c1e803 89442438 448be0 89442440 }
            // n = 5, score = 100
            //   488d15de63feff       | movzx               eax, byte ptr [edx + edx]
            //   c1e803               | inc                 edx
            //   89442438             | movzx               eax, byte ptr [ecx + edx]
            //   448be0               | inc                 edx
            //   89442440             | mov                 byte ptr [edx + edx], al

        $sequence_9 = { c6435401 488d0d4f1e0100 480f45cf 48894b48 e8???????? eb17 4885ff }
            // n = 7, score = 100
            //   c6435401             | dec                 eax
            //   488d0d4f1e0100       | xor                 eax, esp
            //   480f45cf             | dec                 eax
            //   48894b48             | mov                 dword ptr [esp + 0x38], eax
            //   e8????????           |                     
            //   eb17                 | dec                 eax
            //   4885ff               | mov                 edi, ecx

    condition:
        7 of them and filesize < 643072
}