rule win_webc2_adspace_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.webc2_adspace."
        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.webc2_adspace"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b1d???????? 8d842428010000 50 55 ffd3 83c414 }
            // n = 6, score = 100
            //   8b1d????????         |                     
            //   8d842428010000       | lea                 eax, [esp + 0x128]
            //   50                   | push                eax
            //   55                   | push                ebp
            //   ffd3                 | call                ebx
            //   83c414               | add                 esp, 0x14

        $sequence_1 = { e8???????? 53 e8???????? 8b1d???????? 83c440 bf???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   83c440               | add                 esp, 0x40
            //   bf????????           |                     

        $sequence_2 = { 83c410 8bf0 e8???????? 6a50 59 }
            // n = 5, score = 100
            //   83c410               | add                 esp, 0x10
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   6a50                 | push                0x50
            //   59                   | pop                 ecx

        $sequence_3 = { ffd6 b8???????? 5e 5b c9 }
            // n = 5, score = 100
            //   ffd6                 | call                esi
            //   b8????????           |                     
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               

        $sequence_4 = { 8be8 68???????? 55 e8???????? 83c410 85c0 0f84f8010000 }
            // n = 7, score = 100
            //   8be8                 | mov                 ebp, eax
            //   68????????           |                     
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   0f84f8010000         | je                  0x1fe

        $sequence_5 = { 57 55 e8???????? 83c40c 8bf8 57 56 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8bf8                 | mov                 edi, eax
            //   57                   | push                edi
            //   56                   | push                esi

        $sequence_6 = { 85c0 0f85a7000000 8d8580feffff 68???????? 50 ffd6 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f85a7000000         | jne                 0xad
            //   8d8580feffff         | lea                 eax, [ebp - 0x180]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi

        $sequence_7 = { ffd3 59 85c0 59 7403 }
            // n = 5, score = 100
            //   ffd3                 | call                ebx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   7403                 | je                  5

        $sequence_8 = { 56 ff15???????? 8b45fc 56 8b35???????? 881c38 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   56                   | push                esi
            //   8b35????????         |                     
            //   881c38               | mov                 byte ptr [eax + edi], bl

        $sequence_9 = { 59 33c0 8d7d81 6a00 }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   8d7d81               | lea                 edi, [ebp - 0x7f]
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 49152
}