rule win_aurora_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.aurora."
        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.aurora"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8b4e14 8945d4 8b4610 3bc1 7530 40 83f8fe }
            // n = 7, score = 300
            //   8b4e14               | mov                 ecx, dword ptr [esi + 0x14]
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   3bc1                 | cmp                 eax, ecx
            //   7530                 | jne                 0x32
            //   40                   | inc                 eax
            //   83f8fe               | cmp                 eax, -2

        $sequence_1 = { 0fb60431 41 33c2 69d093010001 3bcf 72ef 8bb570ffffff }
            // n = 7, score = 300
            //   0fb60431             | movzx               eax, byte ptr [ecx + esi]
            //   41                   | inc                 ecx
            //   33c2                 | xor                 eax, edx
            //   69d093010001         | imul                edx, eax, 0x1000193
            //   3bcf                 | cmp                 ecx, edi
            //   72ef                 | jb                  0xfffffff1
            //   8bb570ffffff         | mov                 esi, dword ptr [ebp - 0x90]

        $sequence_2 = { 6a00 50 8bf2 e8???????? 68???????? }
            // n = 5, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bf2                 | mov                 esi, edx
            //   e8????????           |                     
            //   68????????           |                     

        $sequence_3 = { 8d4da8 e8???????? b001 8b4df4 64890d00000000 59 8b4df0 }
            // n = 7, score = 300
            //   8d4da8               | lea                 ecx, dword ptr [ebp - 0x58]
            //   e8????????           |                     
            //   b001                 | mov                 al, 1
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]

        $sequence_4 = { 33c5 50 8d45f4 64a300000000 8bf1 837e5000 757c }
            // n = 7, score = 300
            //   33c5                 | xor                 eax, ebp
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, dword ptr [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8bf1                 | mov                 esi, ecx
            //   837e5000             | cmp                 dword ptr [esi + 0x50], 0
            //   757c                 | jne                 0x7e

        $sequence_5 = { 85ff 75da 837e1410 897e10 720d 8b06 }
            // n = 6, score = 300
            //   85ff                 | test                edi, edi
            //   75da                 | jne                 0xffffffdc
            //   837e1410             | cmp                 dword ptr [esi + 0x14], 0x10
            //   897e10               | mov                 dword ptr [esi + 0x10], edi
            //   720d                 | jb                  0xf
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_6 = { 8b06 eb02 8bc6 6a08 }
            // n = 4, score = 300
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   eb02                 | jmp                 4
            //   8bc6                 | mov                 eax, esi
            //   6a08                 | push                8

        $sequence_7 = { 50 53 e8???????? 8b45cc 83c408 83f810 7242 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   83c408               | add                 esp, 8
            //   83f810               | cmp                 eax, 0x10
            //   7242                 | jb                  0x44

        $sequence_8 = { e8???????? 8d4dbc e8???????? 8b451c 83f810 0f8289000000 8b4d08 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8d4dbc               | lea                 ecx, dword ptr [ebp - 0x44]
            //   e8????????           |                     
            //   8b451c               | mov                 eax, dword ptr [ebp + 0x1c]
            //   83f810               | cmp                 eax, 0x10
            //   0f8289000000         | jb                  0x8f
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_9 = { 8bce e8???????? 8b45bc 83f810 7242 8b4da8 }
            // n = 6, score = 300
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b45bc               | mov                 eax, dword ptr [ebp - 0x44]
            //   83f810               | cmp                 eax, 0x10
            //   7242                 | jb                  0x44
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]

    condition:
        7 of them and filesize < 827392
}