rule win_dnspionage_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dnspionage"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 81ec00020000 a1???????? 33c5 8945fc 56 8d8500feffff 8bf1 }
            // n = 7, score = 200
            //   81ec00020000         | sub                 esp, 0x200
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   56                   | push                esi
            //   8d8500feffff         | lea                 eax, [ebp - 0x200]
            //   8bf1                 | mov                 esi, ecx

        $sequence_1 = { 885102 83c103 894df0 33f6 }
            // n = 4, score = 200
            //   885102               | mov                 byte ptr [ecx + 2], dl
            //   83c103               | add                 ecx, 3
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx
            //   33f6                 | xor                 esi, esi

        $sequence_2 = { 84c0 75f9 2bd1 8bc7 33c9 03c2 }
            // n = 6, score = 200
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   2bd1                 | sub                 edx, ecx
            //   8bc7                 | mov                 eax, edi
            //   33c9                 | xor                 ecx, ecx
            //   03c2                 | add                 eax, edx

        $sequence_3 = { 8d4e01 51 e8???????? 83c404 8bd8 56 57 }
            // n = 7, score = 200
            //   8d4e01               | lea                 ecx, [esi + 1]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8bd8                 | mov                 ebx, eax
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_4 = { 46 84c0 75f9 2bf1 3bde 0f8da0000000 0fbe043b }
            // n = 7, score = 200
            //   46                   | inc                 esi
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   2bf1                 | sub                 esi, ecx
            //   3bde                 | cmp                 ebx, esi
            //   0f8da0000000         | jge                 0xa6
            //   0fbe043b             | movsx               eax, byte ptr [ebx + edi]

        $sequence_5 = { 3bc2 730e 803c0820 7706 40 8945e4 }
            // n = 6, score = 200
            //   3bc2                 | cmp                 eax, edx
            //   730e                 | jae                 0x10
            //   803c0820             | cmp                 byte ptr [eax + ecx], 0x20
            //   7706                 | ja                  8
            //   40                   | inc                 eax
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_6 = { c0fa04 8ac8 c0e102 80e203 02d1 8345ec03 8b5de0 }
            // n = 7, score = 200
            //   c0fa04               | sar                 dl, 4
            //   8ac8                 | mov                 cl, al
            //   c0e102               | shl                 cl, 2
            //   80e203               | and                 dl, 3
            //   02d1                 | add                 dl, cl
            //   8345ec03             | add                 dword ptr [ebp - 0x14], 3
            //   8b5de0               | mov                 ebx, dword ptr [ebp - 0x20]

        $sequence_7 = { be7f000000 eb11 8bf7 8d4e01 0f1f00 }
            // n = 5, score = 200
            //   be7f000000           | mov                 esi, 0x7f
            //   eb11                 | jmp                 0x13
            //   8bf7                 | mov                 esi, edi
            //   8d4e01               | lea                 ecx, [esi + 1]
            //   0f1f00               | nop                 dword ptr [eax]

        $sequence_8 = { 51 e8???????? 8b4de4 83c414 8b45ec }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   83c414               | add                 esp, 0x14
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

        $sequence_9 = { 57 8b7d08 85db 7534 6a01 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   85db                 | test                ebx, ebx
            //   7534                 | jne                 0x36
            //   6a01                 | push                1

    condition:
        7 of them and filesize < 786432
}