rule win_webc2_adspace_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.webc2_adspace"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 59 740d ff7604 e8???????? 85c0 59 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   740d                 | je                  0xf
            //   ff7604               | push                dword ptr [esi + 4]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx

        $sequence_1 = { 58 2bc3 03f8 57 e8???????? 8d4c3308 57 }
            // n = 7, score = 100
            //   58                   | pop                 eax
            //   2bc3                 | sub                 eax, ebx
            //   03f8                 | add                 edi, eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   8d4c3308             | lea                 ecx, [ebx + esi + 8]
            //   57                   | push                edi

        $sequence_2 = { 50 8d4580 6a00 50 }
            // n = 4, score = 100
            //   50                   | push                eax
            //   8d4580               | lea                 eax, [ebp - 0x80]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_3 = { 6a05 56 ff15???????? 8d45dc }
            // n = 4, score = 100
            //   6a05                 | push                5
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8d45dc               | lea                 eax, [ebp - 0x24]

        $sequence_4 = { 59 3bc1 7609 80343112 41 3bc8 72f7 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   3bc1                 | cmp                 eax, ecx
            //   7609                 | jbe                 0xb
            //   80343112             | xor                 byte ptr [ecx + esi], 0x12
            //   41                   | inc                 ecx
            //   3bc8                 | cmp                 ecx, eax
            //   72f7                 | jb                  0xfffffff9

        $sequence_5 = { e8???????? bf???????? 57 56 ffd3 83c428 85c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   bf????????           |                     
            //   57                   | push                edi
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   83c428               | add                 esp, 0x28
            //   85c0                 | test                eax, eax

        $sequence_6 = { 8bf8 c70424???????? ffd6 59 }
            // n = 4, score = 100
            //   8bf8                 | mov                 edi, eax
            //   c70424????????       |                     
            //   ffd6                 | call                esi
            //   59                   | pop                 ecx

        $sequence_7 = { e8???????? 8b35???????? 8d8580feffff 68???????? 50 ffd6 83c418 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b35????????         |                     
            //   8d8580feffff         | lea                 eax, [ebp - 0x180]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   83c418               | add                 esp, 0x18

        $sequence_8 = { 68???????? ff15???????? 0fb705???????? 33c9 }
            // n = 4, score = 100
            //   68????????           |                     
            //   ff15????????         |                     
            //   0fb705????????       |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_9 = { 8b1d???????? 8d842428010000 50 55 }
            // n = 4, score = 100
            //   8b1d????????         |                     
            //   8d842428010000       | lea                 eax, [esp + 0x128]
            //   50                   | push                eax
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 49152
}