rule win_webc2_cson_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 57 50 e8???????? 56 8d8570ffffff 57 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d8570ffffff         | lea                 eax, [ebp - 0x90]
            //   57                   | push                edi

        $sequence_1 = { 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_2 = { 83e864 0f845b010000 48 0f843d010000 }
            // n = 4, score = 100
            //   83e864               | sub                 eax, 0x64
            //   0f845b010000         | je                  0x161
            //   48                   | dec                 eax
            //   0f843d010000         | je                  0x143

        $sequence_3 = { 0f84ef000000 83e805 0f8496000000 83e803 742f 83e805 740a }
            // n = 7, score = 100
            //   0f84ef000000         | je                  0xf5
            //   83e805               | sub                 eax, 5
            //   0f8496000000         | je                  0x9c
            //   83e803               | sub                 eax, 3
            //   742f                 | je                  0x31
            //   83e805               | sub                 eax, 5
            //   740a                 | je                  0xc

        $sequence_4 = { 81ec80000000 66a1???????? 56 57 6a1f 66894580 59 }
            // n = 7, score = 100
            //   81ec80000000         | sub                 esp, 0x80
            //   66a1????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a1f                 | push                0x1f
            //   66894580             | mov                 word ptr [ebp - 0x80], ax
            //   59                   | pop                 ecx

        $sequence_5 = { ff15???????? 8d85c4fdffff 56 50 8d85c4fdffff 50 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8d85c4fdffff         | lea                 eax, [ebp - 0x23c]
            //   56                   | push                esi
            //   50                   | push                eax
            //   8d85c4fdffff         | lea                 eax, [ebp - 0x23c]
            //   50                   | push                eax

        $sequence_6 = { 53 53 8d45b8 57 50 68???????? }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   57                   | push                edi
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_7 = { e8???????? 8064241800 6a0f 59 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8064241800           | and                 byte ptr [esp + 0x18], 0
            //   6a0f                 | push                0xf
            //   59                   | pop                 ecx

        $sequence_8 = { 8d85d8feffff 50 56 c785d8feffff28010000 e8???????? 85c0 744d }
            // n = 7, score = 100
            //   8d85d8feffff         | lea                 eax, [ebp - 0x128]
            //   50                   | push                eax
            //   56                   | push                esi
            //   c785d8feffff28010000     | mov    dword ptr [ebp - 0x128], 0x128
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   744d                 | je                  0x4f

        $sequence_9 = { 59 33ff 6a01 c745f40c000000 58 897df8 a3???????? }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   33ff                 | xor                 edi, edi
            //   6a01                 | push                1
            //   c745f40c000000       | mov                 dword ptr [ebp - 0xc], 0xc
            //   58                   | pop                 eax
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   a3????????           |                     

    condition:
        7 of them and filesize < 98304
}