rule win_webc2_bolid_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 7445 8b4dc4 8bd6 c1e204 03d1 8d8558ffffff 52 }
            // n = 7, score = 100
            //   7445                 | je                  0x47
            //   8b4dc4               | mov                 ecx, dword ptr [ebp - 0x3c]
            //   8bd6                 | mov                 edx, esi
            //   c1e204               | shl                 edx, 4
            //   03d1                 | add                 edx, ecx
            //   8d8558ffffff         | lea                 eax, [ebp - 0xa8]
            //   52                   | push                edx

        $sequence_1 = { f7d1 49 51 68???????? 8d8d78ffffff e8???????? }
            // n = 6, score = 100
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   51                   | push                ecx
            //   68????????           |                     
            //   8d8d78ffffff         | lea                 ecx, [ebp - 0x88]
            //   e8????????           |                     

        $sequence_2 = { 8841ff b001 eb30 49 51 }
            // n = 5, score = 100
            //   8841ff               | mov                 byte ptr [ecx - 1], al
            //   b001                 | mov                 al, 1
            //   eb30                 | jmp                 0x32
            //   49                   | dec                 ecx
            //   51                   | push                ecx

        $sequence_3 = { 0f85db000000 6a01 8d4d88 c645fc0f e8???????? 6a01 }
            // n = 6, score = 100
            //   0f85db000000         | jne                 0xe1
            //   6a01                 | push                1
            //   8d4d88               | lea                 ecx, [ebp - 0x78]
            //   c645fc0f             | mov                 byte ptr [ebp - 4], 0xf
            //   e8????????           |                     
            //   6a01                 | push                1

        $sequence_4 = { e8???????? 83c404 8b4df4 5f 5e 32c0 64890d00000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   32c0                 | xor                 al, al
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_5 = { c645fc16 c6451b5c e8???????? 8d4dd0 }
            // n = 4, score = 100
            //   c645fc16             | mov                 byte ptr [ebp - 4], 0x16
            //   c6451b5c             | mov                 byte ptr [ebp + 0x1b], 0x5c
            //   e8????????           |                     
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]

        $sequence_6 = { 8b4f08 3bc8 7305 e8???????? 8bcf e8???????? 8b4708 }
            // n = 7, score = 100
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]
            //   3bc8                 | cmp                 ecx, eax
            //   7305                 | jae                 7
            //   e8????????           |                     
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8b4708               | mov                 eax, dword ptr [edi + 8]

        $sequence_7 = { 8bf1 89742408 c706???????? 8b4644 33db 3bc3 }
            // n = 6, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   89742408             | mov                 dword ptr [esp + 8], esi
            //   c706????????         |                     
            //   8b4644               | mov                 eax, dword ptr [esi + 0x44]
            //   33db                 | xor                 ebx, ebx
            //   3bc3                 | cmp                 eax, ebx

        $sequence_8 = { 83e203 83f908 7229 f3a5 ff2495b8734000 8bc7 ba03000000 }
            // n = 7, score = 100
            //   83e203               | and                 edx, 3
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495b8734000       | jmp                 dword ptr [edx*4 + 0x4073b8]
            //   8bc7                 | mov                 eax, edi
            //   ba03000000           | mov                 edx, 3

        $sequence_9 = { 895c2434 8d4c2428 8d54244c 51 c68424000200000c 83ec10 }
            // n = 6, score = 100
            //   895c2434             | mov                 dword ptr [esp + 0x34], ebx
            //   8d4c2428             | lea                 ecx, [esp + 0x28]
            //   8d54244c             | lea                 edx, [esp + 0x4c]
            //   51                   | push                ecx
            //   c68424000200000c     | mov                 byte ptr [esp + 0x200], 0xc
            //   83ec10               | sub                 esp, 0x10

    condition:
        7 of them and filesize < 163840
}