rule win_cotx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.cotx."
        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.cotx"
        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 = { c705????????4506ce62 c705????????b60451f0 c705????????3f3f5288 c705????????6a62ae99 c705????????b872ad0c c705????????8ee66789 }
            // n = 6, score = 500
            //   c705????????4506ce62     |     
            //   c705????????b60451f0     |     
            //   c705????????3f3f5288     |     
            //   c705????????6a62ae99     |     
            //   c705????????b872ad0c     |     
            //   c705????????8ee66789     |     

        $sequence_1 = { c78504f8ffff6c732e64 66c78508f8ffff6c6c e8???????? 83c438 }
            // n = 4, score = 500
            //   c78504f8ffff6c732e64     | mov    dword ptr [ebp - 0x7fc], 0x642e736c
            //   66c78508f8ffff6c6c     | mov    word ptr [ebp - 0x7f8], 0x6c6c
            //   e8????????           |                     
            //   83c438               | add                 esp, 0x38

        $sequence_2 = { 66c745fc3a46 c645fe00 e8???????? 83c430 }
            // n = 4, score = 500
            //   66c745fc3a46         | mov                 word ptr [ebp - 4], 0x463a
            //   c645fe00             | mov                 byte ptr [ebp - 2], 0
            //   e8????????           |                     
            //   83c430               | add                 esp, 0x30

        $sequence_3 = { 8b4dfc a3???????? e8???????? 8b15???????? }
            // n = 4, score = 500
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   a3????????           |                     
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_4 = { 8bca 8bd3 83e103 f3a4 8d8d98f6ffff e8???????? }
            // n = 6, score = 500
            //   8bca                 | mov                 ecx, edx
            //   8bd3                 | mov                 edx, ebx
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8d8d98f6ffff         | lea                 ecx, dword ptr [ebp - 0x968]
            //   e8????????           |                     

        $sequence_5 = { c705????????890e9944 c705????????dbd99823 c705????????d468bcb5 c705????????a1a14538 c705????????2086e659 }
            // n = 5, score = 500
            //   c705????????890e9944     |     
            //   c705????????dbd99823     |     
            //   c705????????d468bcb5     |     
            //   c705????????a1a14538     |     
            //   c705????????2086e659     |     

        $sequence_6 = { 83c438 8d8500f8ffff 6a00 50 68???????? ff15???????? }
            // n = 6, score = 500
            //   83c438               | add                 esp, 0x38
            //   8d8500f8ffff         | lea                 eax, dword ptr [ebp - 0x800]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_7 = { 3dbfbc9e63 740e 3d10b6afa6 7407 }
            // n = 4, score = 500
            //   3dbfbc9e63           | cmp                 eax, 0x639ebcbf
            //   740e                 | je                  0x10
            //   3d10b6afa6           | cmp                 eax, 0xa6afb610
            //   7407                 | je                  9

        $sequence_8 = { c785b8faffff39313044 c1e902 f3a5 8bca }
            // n = 4, score = 500
            //   c785b8faffff39313044     | mov    dword ptr [ebp - 0x548], 0x44303139
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx

        $sequence_9 = { c705????????b60451f0 c705????????3f3f5288 c705????????6a62ae99 c705????????b872ad0c c705????????8ee66789 }
            // n = 5, score = 500
            //   c705????????b60451f0     |     
            //   c705????????3f3f5288     |     
            //   c705????????6a62ae99     |     
            //   c705????????b872ad0c     |     
            //   c705????????8ee66789     |     

    condition:
        7 of them and filesize < 1171456
}