rule win_webc2_rave_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 83f830 720b 83f839 7706 83c004 c20400 83f82d }
            // n = 7, score = 100
            //   83f830               | cmp                 eax, 0x30
            //   720b                 | jb                  0xd
            //   83f839               | cmp                 eax, 0x39
            //   7706                 | ja                  8
            //   83c004               | add                 eax, 4
            //   c20400               | ret                 4
            //   83f82d               | cmp                 eax, 0x2d

        $sequence_1 = { 85db 759e 8dbc242c010000 83c9ff 33c0 }
            // n = 5, score = 100
            //   85db                 | test                ebx, ebx
            //   759e                 | jne                 0xffffffa0
            //   8dbc242c010000       | lea                 edi, [esp + 0x12c]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_2 = { 03de 81e3ff000000 8bf3 8a5c3410 885c0c10 }
            // n = 5, score = 100
            //   03de                 | add                 ebx, esi
            //   81e3ff000000         | and                 ebx, 0xff
            //   8bf3                 | mov                 esi, ebx
            //   8a5c3410             | mov                 bl, byte ptr [esp + esi + 0x10]
            //   885c0c10             | mov                 byte ptr [esp + ecx + 0x10], bl

        $sequence_3 = { be???????? 8d8c241c010000 8a01 8ad0 3a06 }
            // n = 5, score = 100
            //   be????????           |                     
            //   8d8c241c010000       | lea                 ecx, [esp + 0x11c]
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   8ad0                 | mov                 dl, al
            //   3a06                 | cmp                 al, byte ptr [esi]

        $sequence_4 = { 8b3d???????? 8d542414 8d4604 51 }
            // n = 4, score = 100
            //   8b3d????????         |                     
            //   8d542414             | lea                 edx, [esp + 0x14]
            //   8d4604               | lea                 eax, [esi + 4]
            //   51                   | push                ecx

        $sequence_5 = { b941000000 33c0 8dbc24b0020000 83c410 }
            // n = 4, score = 100
            //   b941000000           | mov                 ecx, 0x41
            //   33c0                 | xor                 eax, eax
            //   8dbc24b0020000       | lea                 edi, [esp + 0x2b0]
            //   83c410               | add                 esp, 0x10

        $sequence_6 = { 33c9 eb05 1bc9 83d9ff 85c9 7423 8b4508 }
            // n = 7, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   eb05                 | jmp                 7
            //   1bc9                 | sbb                 ecx, ecx
            //   83d9ff               | sbb                 ecx, -1
            //   85c9                 | test                ecx, ecx
            //   7423                 | je                  0x25
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_7 = { 56 57 b900010000 33c0 8d7c2414 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   b900010000           | mov                 ecx, 0x100
            //   33c0                 | xor                 eax, eax
            //   8d7c2414             | lea                 edi, [esp + 0x14]

        $sequence_8 = { 5d 5b 81c454030000 c3 6a20 ffd7 }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   81c454030000         | add                 esp, 0x354
            //   c3                   | ret                 
            //   6a20                 | push                0x20
            //   ffd7                 | call                edi

        $sequence_9 = { 85c0 0f8426010000 8d4c244c 6804010000 8d542450 }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   0f8426010000         | je                  0x12c
            //   8d4c244c             | lea                 ecx, [esp + 0x4c]
            //   6804010000           | push                0x104
            //   8d542450             | lea                 edx, [esp + 0x50]

    condition:
        7 of them and filesize < 57344
}