rule win_dnspionage_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.dnspionage."
        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.dnspionage"
        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 = { b8abaaaaaa f7e1 d1ea 42 8bc2 2503000080 }
            // n = 6, score = 300
            //   b8abaaaaaa           | mov                 eax, 0xaaaaaaab
            //   f7e1                 | mul                 ecx
            //   d1ea                 | shr                 edx, 1
            //   42                   | inc                 edx
            //   8bc2                 | mov                 eax, edx
            //   2503000080           | and                 eax, 0x80000003

        $sequence_1 = { 85f6 7e14 8bcb 2bfb 8bd6 }
            // n = 5, score = 300
            //   85f6                 | test                esi, esi
            //   7e14                 | jle                 0x16
            //   8bcb                 | mov                 ecx, ebx
            //   2bfb                 | sub                 edi, ebx
            //   8bd6                 | mov                 edx, esi

        $sequence_2 = { 0bf1 0bf8 83eb01 75e1 8bc7 99 33c2 }
            // n = 7, score = 300
            //   0bf1                 | or                  esi, ecx
            //   0bf8                 | or                  edi, eax
            //   83eb01               | sub                 ebx, 1
            //   75e1                 | jne                 0xffffffe3
            //   8bc7                 | mov                 eax, edi
            //   99                   | cdq                 
            //   33c2                 | xor                 eax, edx

        $sequence_3 = { 8d4e01 0f94c3 0f1f4000 8a06 46 84c0 75f9 }
            // n = 7, score = 300
            //   8d4e01               | lea                 ecx, dword ptr [esi + 1]
            //   0f94c3               | sete                bl
            //   0f1f4000             | nop                 dword ptr [eax]
            //   8a06                 | mov                 al, byte ptr [esi]
            //   46                   | inc                 esi
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb

        $sequence_4 = { 46 84c0 75f9 2bf1 3bde 0f8da0000000 0fbe043b }
            // n = 7, score = 300
            //   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 = { c6000a 40 015e08 c60000 8b3f }
            // n = 5, score = 300
            //   c6000a               | mov                 byte ptr [eax], 0xa
            //   40                   | inc                 eax
            //   015e08               | add                 dword ptr [esi + 8], ebx
            //   c60000               | mov                 byte ptr [eax], 0
            //   8b3f                 | mov                 edi, dword ptr [edi]

        $sequence_6 = { 4e c0fa04 c0e102 80e203 }
            // n = 4, score = 300
            //   4e                   | dec                 esi
            //   c0fa04               | sar                 dl, 4
            //   c0e102               | shl                 cl, 2
            //   80e203               | and                 dl, 3

        $sequence_7 = { e8???????? 50 ba50000000 b9???????? }
            // n = 4, score = 300
            //   e8????????           |                     
            //   50                   | push                eax
            //   ba50000000           | mov                 edx, 0x50
            //   b9????????           |                     

        $sequence_8 = { e8???????? 8b4d08 8d7bff 83c404 c745f800000000 c645ff00 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8d7bff               | lea                 edi, dword ptr [ebx - 1]
            //   83c404               | add                 esp, 4
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   c645ff00             | mov                 byte ptr [ebp - 1], 0

        $sequence_9 = { babb010000 b9???????? e8???????? 83c420 }
            // n = 4, score = 300
            //   babb010000           | mov                 edx, 0x1bb
            //   b9????????           |                     
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20

    condition:
        7 of them and filesize < 786432
}