rule win_webc2_qbp_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.webc2_qbp."
        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_qbp"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8d95ecfdffff 52 ff15???????? 33c0 e9???????? 8d85ecfdffff 50 }
            // n = 7, score = 100
            //   8d95ecfdffff         | lea                 edx, [ebp - 0x214]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax

        $sequence_1 = { ff15???????? c745d800000000 68???????? ff15???????? 8945d8 837dd800 7414 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   c745d800000000       | mov                 dword ptr [ebp - 0x28], 0
            //   68????????           |                     
            //   ff15????????         |                     
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   837dd800             | cmp                 dword ptr [ebp - 0x28], 0
            //   7414                 | je                  0x16

        $sequence_2 = { 52 e8???????? 83c408 85c0 7440 8b45fc }
            // n = 6, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7440                 | je                  0x42
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_3 = { 83c40c eb62 8b95f0feffff 2b55fc 52 8b85e8fdffff 0345fc }
            // n = 7, score = 100
            //   83c40c               | add                 esp, 0xc
            //   eb62                 | jmp                 0x64
            //   8b95f0feffff         | mov                 edx, dword ptr [ebp - 0x110]
            //   2b55fc               | sub                 edx, dword ptr [ebp - 4]
            //   52                   | push                edx
            //   8b85e8fdffff         | mov                 eax, dword ptr [ebp - 0x218]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]

        $sequence_4 = { 66894dec 66c745f00000 eb0c 668b55f0 }
            // n = 4, score = 100
            //   66894dec             | mov                 word ptr [ebp - 0x14], cx
            //   66c745f00000         | mov                 word ptr [ebp - 0x10], 0
            //   eb0c                 | jmp                 0xe
            //   668b55f0             | mov                 dx, word ptr [ebp - 0x10]

        $sequence_5 = { d1f8 50 ff15???????? 83c404 8945fc 837dfc00 7504 }
            // n = 7, score = 100
            //   d1f8                 | sar                 eax, 1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0
            //   7504                 | jne                 6

        $sequence_6 = { 68???????? 8d854c6cffff 50 e8???????? 83c408 68???????? }
            // n = 6, score = 100
            //   68????????           |                     
            //   8d854c6cffff         | lea                 eax, [ebp - 0x93b4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   68????????           |                     

        $sequence_7 = { 668b55f0 6683ea01 668955f0 0fbf45f0 0fbf4d08 8b55ec }
            // n = 6, score = 100
            //   668b55f0             | mov                 dx, word ptr [ebp - 0x10]
            //   6683ea01             | sub                 dx, 1
            //   668955f0             | mov                 word ptr [ebp - 0x10], dx
            //   0fbf45f0             | movsx               eax, word ptr [ebp - 0x10]
            //   0fbf4d08             | movsx               ecx, word ptr [ebp + 8]
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]

        $sequence_8 = { 668b4df4 6683e902 66894df4 8b55f4 }
            // n = 4, score = 100
            //   668b4df4             | mov                 cx, word ptr [ebp - 0xc]
            //   6683e902             | sub                 cx, 2
            //   66894df4             | mov                 word ptr [ebp - 0xc], cx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]

        $sequence_9 = { 0fbf5508 0fbf45fc 8b4df8 8b75f8 668b945648100000 6689944148100000 }
            // n = 6, score = 100
            //   0fbf5508             | movsx               edx, word ptr [ebp + 8]
            //   0fbf45fc             | movsx               eax, word ptr [ebp - 4]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   668b945648100000     | mov                 dx, word ptr [esi + edx*2 + 0x1048]
            //   6689944148100000     | mov                 word ptr [ecx + eax*2 + 0x1048], dx

    condition:
        7 of them and filesize < 630784
}