rule win_campoloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8a11 8855e4 8345d001 807de400 75ee 8b45d0 }
            // n = 6, score = 200
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   8855e4               | mov                 byte ptr [ebp - 0x1c], dl
            //   8345d001             | add                 dword ptr [ebp - 0x30], 1
            //   807de400             | cmp                 byte ptr [ebp - 0x1c], 0
            //   75ee                 | jne                 0xfffffff0
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]

        $sequence_1 = { 8d85ecfdffff 50 ff15???????? 83c40c 8d8d54efffff 51 8d95ecfdffff }
            // n = 7, score = 200
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   8d8d54efffff         | lea                 ecx, [ebp - 0x10ac]
            //   51                   | push                ecx
            //   8d95ecfdffff         | lea                 edx, [ebp - 0x214]

        $sequence_2 = { 2b4dd8 894dd4 8b55f8 0355d4 8955f8 8b45f8 8be5 }
            // n = 7, score = 200
            //   2b4dd8               | sub                 ecx, dword ptr [ebp - 0x28]
            //   894dd4               | mov                 dword ptr [ebp - 0x2c], ecx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   0355d4               | add                 edx, dword ptr [ebp - 0x2c]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8be5                 | mov                 esp, ebp

        $sequence_3 = { 6a10 8d9520f1ffff 52 8b8568efffff 50 ff15???????? }
            // n = 6, score = 200
            //   6a10                 | push                0x10
            //   8d9520f1ffff         | lea                 edx, [ebp - 0xee0]
            //   52                   | push                edx
            //   8b8568efffff         | mov                 eax, dword ptr [ebp - 0x1098]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_4 = { 8b8580efffff 2b8560efffff 89855cefffff 8b8d5cefffff 898d58efffff c78584efffff00000000 8d55f4 }
            // n = 7, score = 200
            //   8b8580efffff         | mov                 eax, dword ptr [ebp - 0x1080]
            //   2b8560efffff         | sub                 eax, dword ptr [ebp - 0x10a0]
            //   89855cefffff         | mov                 dword ptr [ebp - 0x10a4], eax
            //   8b8d5cefffff         | mov                 ecx, dword ptr [ebp - 0x10a4]
            //   898d58efffff         | mov                 dword ptr [ebp - 0x10a8], ecx
            //   c78584efffff00000000     | mov    dword ptr [ebp - 0x107c], 0
            //   8d55f4               | lea                 edx, [ebp - 0xc]

        $sequence_5 = { 51 ff15???????? 83c40c c7458844000000 b907000000 be???????? }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   c7458844000000       | mov                 dword ptr [ebp - 0x78], 0x44
            //   b907000000           | mov                 ecx, 7
            //   be????????           |                     

        $sequence_6 = { 50 ff15???????? 89858cefffff 83bd8cefffff00 0f8ee9000000 83bd64efffff01 7533 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   89858cefffff         | mov                 dword ptr [ebp - 0x1074], eax
            //   83bd8cefffff00       | cmp                 dword ptr [ebp - 0x1074], 0
            //   0f8ee9000000         | jle                 0xef
            //   83bd64efffff01       | cmp                 dword ptr [ebp - 0x109c], 1
            //   7533                 | jne                 0x35

        $sequence_7 = { 8a11 8855e6 8345d801 807de600 75ee }
            // n = 5, score = 200
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   8855e6               | mov                 byte ptr [ebp - 0x1a], dl
            //   8345d801             | add                 dword ptr [ebp - 0x28], 1
            //   807de600             | cmp                 byte ptr [ebp - 0x1a], 0
            //   75ee                 | jne                 0xfffffff0

        $sequence_8 = { 8d8d90efffff 51 6802010000 ff15???????? 85c0 }
            // n = 5, score = 200
            //   8d8d90efffff         | lea                 ecx, [ebp - 0x1070]
            //   51                   | push                ecx
            //   6802010000           | push                0x102
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_9 = { 57 6a44 6a00 8d4588 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   6a44                 | push                0x44
            //   6a00                 | push                0
            //   8d4588               | lea                 eax, [ebp - 0x78]

    condition:
        7 of them and filesize < 66560
}