rule win_webc2_rave_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.webc2_rave."
        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_rave"
        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 = { b900010000 8dbc24b0040000 f3ab 8d4c241c 53 }
            // n = 5, score = 100
            //   b900010000           | mov                 ecx, 0x100
            //   8dbc24b0040000       | lea                 edi, [esp + 0x4b0]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   53                   | push                ebx

        $sequence_1 = { ff15???????? 83c410 3dffff0000 7f11 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10
            //   3dffff0000           | cmp                 eax, 0xffff
            //   7f11                 | jg                  0x13

        $sequence_2 = { 33c0 8d7c2450 895c244c 8bb424b8080000 }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   8d7c2450             | lea                 edi, [esp + 0x50]
            //   895c244c             | mov                 dword ptr [esp + 0x4c], ebx
            //   8bb424b8080000       | mov                 esi, dword ptr [esp + 0x8b8]

        $sequence_3 = { 3bdd 57 0f845d010000 8b7c2420 3bfd 0f8451010000 396c2424 }
            // n = 7, score = 100
            //   3bdd                 | cmp                 ebx, ebp
            //   57                   | push                edi
            //   0f845d010000         | je                  0x163
            //   8b7c2420             | mov                 edi, dword ptr [esp + 0x20]
            //   3bfd                 | cmp                 edi, ebp
            //   0f8451010000         | je                  0x157
            //   396c2424             | cmp                 dword ptr [esp + 0x24], ebp

        $sequence_4 = { 51 ffd7 8b4608 3bc3 7409 50 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ffd7                 | call                edi
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   3bc3                 | cmp                 eax, ebx
            //   7409                 | je                  0xb
            //   50                   | push                eax

        $sequence_5 = { a1???????? 83f805 7d27 8bd0 8d4c2410 42 }
            // n = 6, score = 100
            //   a1????????           |                     
            //   83f805               | cmp                 eax, 5
            //   7d27                 | jge                 0x29
            //   8bd0                 | mov                 edx, eax
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   42                   | inc                 edx

        $sequence_6 = { 6a00 51 56 53 ffd5 8bf8 }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   56                   | push                esi
            //   53                   | push                ebx
            //   ffd5                 | call                ebp
            //   8bf8                 | mov                 edi, eax

        $sequence_7 = { 8bf3 8a5c3410 885c0c10 88443410 8a5c0c10 }
            // n = 5, score = 100
            //   8bf3                 | mov                 esi, ebx
            //   8a5c3410             | mov                 bl, byte ptr [esp + esi + 0x10]
            //   885c0c10             | mov                 byte ptr [esp + ecx + 0x10], bl
            //   88443410             | mov                 byte ptr [esp + esi + 0x10], al
            //   8a5c0c10             | mov                 bl, byte ptr [esp + ecx + 0x10]

        $sequence_8 = { f3a5 8bcd 83e103 f3a4 8b742410 2bf2 }
            // n = 6, score = 100
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bcd                 | mov                 ecx, ebp
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   2bf2                 | sub                 esi, edx

        $sequence_9 = { ff15???????? 83f8ff 746d 8b9424d4010000 66c74424140200 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   746d                 | je                  0x6f
            //   8b9424d4010000       | mov                 edx, dword ptr [esp + 0x1d4]
            //   66c74424140200       | mov                 word ptr [esp + 0x14], 2

    condition:
        7 of them and filesize < 57344
}