rule win_webc2_bolid_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.webc2_bolid."
        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_bolid"
        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 = { 837b2404 7515 8d450c 6a04 50 56 8bcb }
            // n = 7, score = 100
            //   837b2404             | cmp                 dword ptr [ebx + 0x24], 4
            //   7515                 | jne                 0x17
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   6a04                 | push                4
            //   50                   | push                eax
            //   56                   | push                esi
            //   8bcb                 | mov                 ecx, ebx

        $sequence_1 = { e8???????? 84c0 742b 8bbb00010000 8bce 8d83fc000000 8bd1 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   742b                 | je                  0x2d
            //   8bbb00010000         | mov                 edi, dword ptr [ebx + 0x100]
            //   8bce                 | mov                 ecx, esi
            //   8d83fc000000         | lea                 eax, [ebx + 0xfc]
            //   8bd1                 | mov                 edx, ecx

        $sequence_2 = { 03c9 51 50 6a2b 52 ffd6 85c0 }
            // n = 7, score = 100
            //   03c9                 | add                 ecx, ecx
            //   51                   | push                ecx
            //   50                   | push                eax
            //   6a2b                 | push                0x2b
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax

        $sequence_3 = { 6a00 c645fc0a 8811 e8???????? 8a45f3 8d8bfc000000 6a00 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   c645fc0a             | mov                 byte ptr [ebp - 4], 0xa
            //   8811                 | mov                 byte ptr [ecx], dl
            //   e8????????           |                     
            //   8a45f3               | mov                 al, byte ptr [ebp - 0xd]
            //   8d8bfc000000         | lea                 ecx, [ebx + 0xfc]
            //   6a00                 | push                0

        $sequence_4 = { 8b8bc8000000 8b4508 8b93c4000000 41 }
            // n = 4, score = 100
            //   8b8bc8000000         | mov                 ecx, dword ptr [ebx + 0xc8]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b93c4000000         | mov                 edx, dword ptr [ebx + 0xc4]
            //   41                   | inc                 ecx

        $sequence_5 = { 3bc7 7714 8b55fc 8a92e0164100 }
            // n = 4, score = 100
            //   3bc7                 | cmp                 eax, edi
            //   7714                 | ja                  0x16
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8a92e0164100         | mov                 dl, byte ptr [edx + 0x4116e0]

        $sequence_6 = { f7d1 49 8bf9 8d4b7c }
            // n = 4, score = 100
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   8bf9                 | mov                 edi, ecx
            //   8d4b7c               | lea                 ecx, [ebx + 0x7c]

        $sequence_7 = { eb09 c1e602 8b86941c4100 8bd3 8d4801 69d26d010000 }
            // n = 6, score = 100
            //   eb09                 | jmp                 0xb
            //   c1e602               | shl                 esi, 2
            //   8b86941c4100         | mov                 eax, dword ptr [esi + 0x411c94]
            //   8bd3                 | mov                 edx, ebx
            //   8d4801               | lea                 ecx, [eax + 1]
            //   69d26d010000         | imul                edx, edx, 0x16d

        $sequence_8 = { 8b74242c 56 e8???????? 83c404 8d4c2414 }
            // n = 5, score = 100
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d4c2414             | lea                 ecx, [esp + 0x14]

        $sequence_9 = { 8b4dbc 85c9 7505 b9???????? }
            // n = 4, score = 100
            //   8b4dbc               | mov                 ecx, dword ptr [ebp - 0x44]
            //   85c9                 | test                ecx, ecx
            //   7505                 | jne                 7
            //   b9????????           |                     

    condition:
        7 of them and filesize < 163840
}