rule win_campoloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 898d7cefffff 8b957cefffff 83c201 89954cefffff 8b857cefffff }
            // n = 5, score = 200
            //   898d7cefffff         | mov                 dword ptr [ebp - 0x1084], ecx
            //   8b957cefffff         | mov                 edx, dword ptr [ebp - 0x1084]
            //   83c201               | add                 edx, 1
            //   89954cefffff         | mov                 dword ptr [ebp - 0x10b4], edx
            //   8b857cefffff         | mov                 eax, dword ptr [ebp - 0x1084]

        $sequence_1 = { 8d8d30f1ffff 51 e8???????? 83c404 89856cefffff }
            // n = 5, score = 200
            //   8d8d30f1ffff         | lea                 ecx, [ebp - 0xed0]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   89856cefffff         | mov                 dword ptr [ebp - 0x1094], eax

        $sequence_2 = { 8b510c 8b0410 8b08 898d24f1ffff 6a10 }
            // n = 5, score = 200
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   8b0410               | mov                 eax, dword ptr [eax + edx]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   898d24f1ffff         | mov                 dword ptr [ebp - 0xedc], ecx
            //   6a10                 | push                0x10

        $sequence_3 = { 83c40c 8d8d54efffff 51 8d95ecfdffff 52 8d85f0feffff }
            // n = 6, score = 200
            //   83c40c               | add                 esp, 0xc
            //   8d8d54efffff         | lea                 ecx, [ebp - 0x10ac]
            //   51                   | push                ecx
            //   8d95ecfdffff         | lea                 edx, [ebp - 0x214]
            //   52                   | push                edx
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]

        $sequence_4 = { 83c001 898560efffff 8b8d80efffff 8a11 88958befffff 838580efffff01 }
            // n = 6, score = 200
            //   83c001               | add                 eax, 1
            //   898560efffff         | mov                 dword ptr [ebp - 0x10a0], eax
            //   8b8d80efffff         | mov                 ecx, dword ptr [ebp - 0x1080]
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   88958befffff         | mov                 byte ptr [ebp - 0x1075], dl
            //   838580efffff01       | add                 dword ptr [ebp - 0x1080], 1

        $sequence_5 = { c745f8ffffffff 8b45e8 50 8b4d08 51 }
            // n = 5, score = 200
            //   c745f8ffffffff       | mov                 dword ptr [ebp - 8], 0xffffffff
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx

        $sequence_6 = { 83c418 8d8d90efffff 51 6802010000 }
            // n = 4, score = 200
            //   83c418               | add                 esp, 0x18
            //   8d8d90efffff         | lea                 ecx, [ebp - 0x1070]
            //   51                   | push                ecx
            //   6802010000           | push                0x102

        $sequence_7 = { 52 ff15???????? a3???????? 68???????? 8b45f8 }
            // n = 5, score = 200
            //   52                   | push                edx
            //   ff15????????         |                     
            //   a3????????           |                     
            //   68????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_8 = { 8945fc a1???????? 8945f4 8a0d???????? 884df8 }
            // n = 5, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   a1????????           |                     
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8a0d????????         |                     
            //   884df8               | mov                 byte ptr [ebp - 8], cl

        $sequence_9 = { 51 e8???????? 83c410 8d55f4 899580efffff 8b8580efffff }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d55f4               | lea                 edx, [ebp - 0xc]
            //   899580efffff         | mov                 dword ptr [ebp - 0x1080], edx
            //   8b8580efffff         | mov                 eax, dword ptr [ebp - 0x1080]

    condition:
        7 of them and filesize < 66560
}