rule win_campoloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.campoloader."
        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.campoloader"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 8bec 83ec68 a1???????? 33c5 8945fc c745c800000000 }
            // n = 6, score = 300
            //   8bec                 | mov                 ebp, esp
            //   83ec68               | sub                 esp, 0x68
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   c745c800000000       | mov                 dword ptr [ebp - 0x38], 0

        $sequence_1 = { 8b4dc4 8a11 8855e3 8345c401 807de300 75ee }
            // n = 6, score = 300
            //   8b4dc4               | mov                 ecx, dword ptr [ebp - 0x3c]
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   8855e3               | mov                 byte ptr [ebp - 0x1d], dl
            //   8345c401             | add                 dword ptr [ebp - 0x3c], 1
            //   807de300             | cmp                 byte ptr [ebp - 0x1d], 0
            //   75ee                 | jne                 0xfffffff0

        $sequence_2 = { 0fb78554efffff 50 ff15???????? 66898522f1ffff b902000000 66898d20f1ffff ba04000000 }
            // n = 7, score = 300
            //   0fb78554efffff       | movzx               eax, word ptr [ebp - 0x10ac]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   66898522f1ffff       | mov                 word ptr [ebp - 0xede], ax
            //   b902000000           | mov                 ecx, 2
            //   66898d20f1ffff       | mov                 word ptr [ebp - 0xee0], cx
            //   ba04000000           | mov                 edx, 4

        $sequence_3 = { 8b55c0 2b55c8 52 8b4508 0345c8 50 8b4d0c }
            // n = 7, score = 300
            //   8b55c0               | mov                 edx, dword ptr [ebp - 0x40]
            //   2b55c8               | sub                 edx, dword ptr [ebp - 0x38]
            //   52                   | push                edx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0345c8               | add                 eax, dword ptr [ebp - 0x38]
            //   50                   | push                eax
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_4 = { 8945ec 8b4dec 83c101 894dd8 8b55ec 8a02 }
            // n = 6, score = 300
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   83c101               | add                 ecx, 1
            //   894dd8               | mov                 dword ptr [ebp - 0x28], ecx
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8a02                 | mov                 al, byte ptr [edx]

        $sequence_5 = { 83c404 898584efffff c78564efffff01000000 c7856cefffff00000000 6a00 68b80b0000 }
            // n = 6, score = 300
            //   83c404               | add                 esp, 4
            //   898584efffff         | mov                 dword ptr [ebp - 0x107c], eax
            //   c78564efffff01000000     | mov    dword ptr [ebp - 0x109c], 1
            //   c7856cefffff00000000     | mov    dword ptr [ebp - 0x1094], 0
            //   6a00                 | push                0
            //   68b80b0000           | push                0xbb8

        $sequence_6 = { 898584efffff c78564efffff01000000 c7856cefffff00000000 6a00 }
            // n = 4, score = 300
            //   898584efffff         | mov                 dword ptr [ebp - 0x107c], eax
            //   c78564efffff01000000     | mov    dword ptr [ebp - 0x109c], 1
            //   c7856cefffff00000000     | mov    dword ptr [ebp - 0x1094], 0
            //   6a00                 | push                0

        $sequence_7 = { 52 ff15???????? 83c408 898584efffff 8b858cefffff }
            // n = 5, score = 300
            //   52                   | push                edx
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   898584efffff         | mov                 dword ptr [ebp - 0x107c], eax
            //   8b858cefffff         | mov                 eax, dword ptr [ebp - 0x1074]

        $sequence_8 = { 88958befffff 838580efffff01 80bd8befffff00 75e2 8b8580efffff 2b8560efffff }
            // n = 6, score = 300
            //   88958befffff         | mov                 byte ptr [ebp - 0x1075], dl
            //   838580efffff01       | add                 dword ptr [ebp - 0x1080], 1
            //   80bd8befffff00       | cmp                 byte ptr [ebp - 0x1075], 0
            //   75e2                 | jne                 0xffffffe4
            //   8b8580efffff         | mov                 eax, dword ptr [ebp - 0x1080]
            //   2b8560efffff         | sub                 eax, dword ptr [ebp - 0x10a0]

        $sequence_9 = { 8345d801 807de600 75ee 8b45d8 2b45b4 8945b0 }
            // n = 6, score = 300
            //   8345d801             | add                 dword ptr [ebp - 0x28], 1
            //   807de600             | cmp                 byte ptr [ebp - 0x1a], 0
            //   75ee                 | jne                 0xfffffff0
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   2b45b4               | sub                 eax, dword ptr [ebp - 0x4c]
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax

    condition:
        7 of them and filesize < 66560
}