rule win_ratankba_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.ratankba."
        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.ratankba"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8d95e9feffff 53 52 8985c8feffff 898dc4feffff 889de8feffff e8???????? }
            // n = 7, score = 400
            //   8d95e9feffff         | lea                 edx, [ebp - 0x117]
            //   53                   | push                ebx
            //   52                   | push                edx
            //   8985c8feffff         | mov                 dword ptr [ebp - 0x138], eax
            //   898dc4feffff         | mov                 dword ptr [ebp - 0x13c], ecx
            //   889de8feffff         | mov                 byte ptr [ebp - 0x118], bl
            //   e8????????           |                     

        $sequence_1 = { e8???????? 8be5 5d c3 53 57 ff15???????? }
            // n = 7, score = 400
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   53                   | push                ebx
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_2 = { 7509 5f 83c8ff 5e 5d c20800 8b4d0c }
            // n = 7, score = 400
            //   7509                 | jne                 0xb
            //   5f                   | pop                 edi
            //   83c8ff               | or                  eax, 0xffffffff
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_3 = { e8???????? 83c40c 57 e8???????? 8bbdb8eeffff 83c404 8b9530efffff }
            // n = 7, score = 400
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bbdb8eeffff         | mov                 edi, dword ptr [ebp - 0x1148]
            //   83c404               | add                 esp, 4
            //   8b9530efffff         | mov                 edx, dword ptr [ebp - 0x10d0]

        $sequence_4 = { e8???????? 8b5304 8b4b14 894cc204 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   8b5304               | mov                 edx, dword ptr [ebx + 4]
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]
            //   894cc204             | mov                 dword ptr [edx + eax*8 + 4], ecx

        $sequence_5 = { 8b04ca 50 e8???????? 8b4f10 894de4 8b4d08 }
            // n = 6, score = 400
            //   8b04ca               | mov                 eax, dword ptr [edx + ecx*8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4f10               | mov                 ecx, dword ptr [edi + 0x10]
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_6 = { ff15???????? 85c0 0f8463ffffff 8d55a8 52 8d45ec 50 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8463ffffff         | je                  0xffffff69
            //   8d55a8               | lea                 edx, [ebp - 0x58]
            //   52                   | push                edx
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax

        $sequence_7 = { 8bf0 83c404 89b510efffff 85f6 0f8400030000 }
            // n = 5, score = 400
            //   8bf0                 | mov                 esi, eax
            //   83c404               | add                 esp, 4
            //   89b510efffff         | mov                 dword ptr [ebp - 0x10f0], esi
            //   85f6                 | test                esi, esi
            //   0f8400030000         | je                  0x306

        $sequence_8 = { 7430 8b8be0000000 8d9538efffff 52 51 50 }
            // n = 6, score = 400
            //   7430                 | je                  0x32
            //   8b8be0000000         | mov                 ecx, dword ptr [ebx + 0xe0]
            //   8d9538efffff         | lea                 edx, [ebp - 0x10c8]
            //   52                   | push                edx
            //   51                   | push                ecx
            //   50                   | push                eax

        $sequence_9 = { 8bc7 897318 897314 8933 89731c 8d5002 }
            // n = 6, score = 400
            //   8bc7                 | mov                 eax, edi
            //   897318               | mov                 dword ptr [ebx + 0x18], esi
            //   897314               | mov                 dword ptr [ebx + 0x14], esi
            //   8933                 | mov                 dword ptr [ebx], esi
            //   89731c               | mov                 dword ptr [ebx + 0x1c], esi
            //   8d5002               | lea                 edx, [eax + 2]

    condition:
        7 of them and filesize < 303104
}