rule win_webc2_cson_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 5b c9 c20400 c605????????01 be00900100 }
            // n = 5, score = 100
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c20400               | ret                 4
            //   c605????????01       |                     
            //   be00900100           | mov                 esi, 0x19000

        $sequence_1 = { eb2a 8d45c0 68???????? 50 ff15???????? 59 }
            // n = 6, score = 100
            //   eb2a                 | jmp                 0x2c
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   59                   | pop                 ecx

        $sequence_2 = { 53 ff15???????? 85c0 7515 53 ffd6 55 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7515                 | jne                 0x17
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   55                   | push                ebp

        $sequence_3 = { c745f420000000 ffd6 8d8540ffffff 50 ff15???????? }
            // n = 5, score = 100
            //   c745f420000000       | mov                 dword ptr [ebp - 0xc], 0x20
            //   ffd6                 | call                esi
            //   8d8540ffffff         | lea                 eax, [ebp - 0xc0]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_4 = { e8???????? 83f807 59 730a }
            // n = 4, score = 100
            //   e8????????           |                     
            //   83f807               | cmp                 eax, 7
            //   59                   | pop                 ecx
            //   730a                 | jae                 0xc

        $sequence_5 = { 8d8540ffffff 50 e8???????? 8d8540ffffff 50 e8???????? }
            // n = 6, score = 100
            //   8d8540ffffff         | lea                 eax, [ebp - 0xc0]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8540ffffff         | lea                 eax, [ebp - 0xc0]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 7512 55 ffd6 57 }
            // n = 4, score = 100
            //   7512                 | jne                 0x14
            //   55                   | push                ebp
            //   ffd6                 | call                esi
            //   57                   | push                edi

        $sequence_7 = { 50 e8???????? 8d45c0 50 8d8540ffffff 50 e8???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   50                   | push                eax
            //   8d8540ffffff         | lea                 eax, [ebp - 0xc0]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 59 33c0 8dbdc1feffff 889dc0feffff }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   8dbdc1feffff         | lea                 edi, [ebp - 0x13f]
            //   889dc0feffff         | mov                 byte ptr [ebp - 0x140], bl

        $sequence_9 = { 50 ff15???????? 8b35???????? 8d85c4fdffff 50 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   8d85c4fdffff         | lea                 eax, [ebp - 0x23c]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 98304
}