rule win_dnspionage_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dnspionage"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 8ac2 c0ec02 c0e804 80e603 8ada c0e604 8a55ff }
            // n = 7, score = 200
            //   8ac2                 | mov                 al, dl
            //   c0ec02               | shr                 ah, 2
            //   c0e804               | shr                 al, 4
            //   80e603               | and                 dh, 3
            //   8ada                 | mov                 bl, dl
            //   c0e604               | shl                 dh, 4
            //   8a55ff               | mov                 dl, byte ptr [ebp - 1]

        $sequence_1 = { e8???????? 8bd8 83c408 2bdf 78cc 8d4301 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   83c408               | add                 esp, 8
            //   2bdf                 | sub                 ebx, edi
            //   78cc                 | js                  0xffffffce
            //   8d4301               | lea                 eax, [ebx + 1]

        $sequence_2 = { c6843518feffff00 8d8500feffff 50 6a00 ff15???????? }
            // n = 5, score = 200
            //   c6843518feffff00     | mov                 byte ptr [ebp + esi - 0x1e8], 0
            //   8d8500feffff         | lea                 eax, [ebp - 0x200]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_3 = { 57 8b7908 897dfc 85f6 7508 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8b7908               | mov                 edi, dword ptr [ecx + 8]
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   85f6                 | test                esi, esi
            //   7508                 | jne                 0xa

        $sequence_4 = { 6a00 6a00 ff75ec 57 50 }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   57                   | push                edi
            //   50                   | push                eax

        $sequence_5 = { 8b01 ff5010 33c0 5b }
            // n = 4, score = 200
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5010               | call                dword ptr [eax + 0x10]
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx

        $sequence_6 = { 53 50 ff75fc ff15???????? 5b }
            // n = 5, score = 200
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   5b                   | pop                 ebx

        $sequence_7 = { 895dfc 8903 ff15???????? 83c404 85c0 }
            // n = 5, score = 200
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   8903                 | mov                 dword ptr [ebx], eax
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_8 = { 8b4de4 83c404 33f6 8945e8 8975ec 8945f0 8a01 }
            // n = 7, score = 200
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   83c404               | add                 esp, 4
            //   33f6                 | xor                 esi, esi
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8975ec               | mov                 dword ptr [ebp - 0x14], esi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8a01                 | mov                 al, byte ptr [ecx]

        $sequence_9 = { 8bce 8903 83c408 c1e902 }
            // n = 4, score = 200
            //   8bce                 | mov                 ecx, esi
            //   8903                 | mov                 dword ptr [ebx], eax
            //   83c408               | add                 esp, 8
            //   c1e902               | shr                 ecx, 2

    condition:
        7 of them and filesize < 786432
}