rule win_webc2_cson_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.webc2_cson."
        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_cson"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { e9???????? 8d45f4 53 50 8d8540ffffff 50 }
            // n = 6, score = 100
            //   e9????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   8d8540ffffff         | lea                 eax, [ebp - 0xc0]
            //   50                   | push                eax

        $sequence_1 = { 33c0 8dbd01fcffff f3ab 66ab 6a00 }
            // n = 5, score = 100
            //   33c0                 | xor                 eax, eax
            //   8dbd01fcffff         | lea                 edi, [ebp - 0x3ff]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   6a00                 | push                0

        $sequence_2 = { 8dbded6bfeff 889dec6bfeff f3ab 66ab aa 8d45ec }
            // n = 6, score = 100
            //   8dbded6bfeff         | lea                 edi, [ebp - 0x19413]
            //   889dec6bfeff         | mov                 byte ptr [ebp - 0x19414], bl
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d45ec               | lea                 eax, [ebp - 0x14]

        $sequence_3 = { 57 ff15???????? 8b35???????? 8be8 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   8be8                 | mov                 ebp, eax

        $sequence_4 = { 8d85acfeffff 6800010000 50 ff15???????? 8d85acfeffff }
            // n = 5, score = 100
            //   8d85acfeffff         | lea                 eax, [ebp - 0x154]
            //   6800010000           | push                0x100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85acfeffff         | lea                 eax, [ebp - 0x154]

        $sequence_5 = { 68???????? 50 ff15???????? 8bf8 3bfb 7511 }
            // n = 6, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   3bfb                 | cmp                 edi, ebx
            //   7511                 | jne                 0x13

        $sequence_6 = { 3bf3 59 7428 56 ff75fc 6a01 ff75f0 }
            // n = 7, score = 100
            //   3bf3                 | cmp                 esi, ebx
            //   59                   | pop                 ecx
            //   7428                 | je                  0x2a
            //   56                   | push                esi
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6a01                 | push                1
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_7 = { 33c0 59 8dbd41ffffff 889d40ffffff 68???????? f3ab 66ab }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8dbd41ffffff         | lea                 edi, [ebp - 0xbf]
            //   889d40ffffff         | mov                 byte ptr [ebp - 0xc0], bl
            //   68????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_8 = { 50 ff15???????? e9???????? 8d45c0 68???????? 50 ff15???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   e9????????           |                     
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_9 = { 8b35???????? 8d45f4 53 50 8d45e0 c745f410000000 50 }
            // n = 7, score = 100
            //   8b35????????         |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   c745f410000000       | mov                 dword ptr [ebp - 0xc], 0x10
            //   50                   | push                eax

    condition:
        7 of them and filesize < 98304
}