rule win_ratankba_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 720a b857000780 e8???????? 8b4b04 5f 8944d104 }
            // n = 6, score = 400
            //   720a                 | jb                  0xc
            //   b857000780           | mov                 eax, 0x80070057
            //   e8????????           |                     
            //   8b4b04               | mov                 ecx, dword ptr [ebx + 4]
            //   5f                   | pop                 edi
            //   8944d104             | mov                 dword ptr [ecx + edx*8 + 4], eax

        $sequence_1 = { 7407 50 ff15???????? 80bd2fefffff00 0f8421080000 8bb528efffff 8b83dc000000 }
            // n = 7, score = 400
            //   7407                 | je                  9
            //   50                   | push                eax
            //   ff15????????         |                     
            //   80bd2fefffff00       | cmp                 byte ptr [ebp - 0x10d1], 0
            //   0f8421080000         | je                  0x827
            //   8bb528efffff         | mov                 esi, dword ptr [ebp - 0x10d8]
            //   8b83dc000000         | mov                 eax, dword ptr [ebx + 0xdc]

        $sequence_2 = { 2bf7 d1fe 8d3473 8930 }
            // n = 4, score = 400
            //   2bf7                 | sub                 esi, edi
            //   d1fe                 | sar                 esi, 1
            //   8d3473               | lea                 esi, [ebx + esi*2]
            //   8930                 | mov                 dword ptr [eax], esi

        $sequence_3 = { 8be5 5d c20800 6a10 e8???????? 894508 }
            // n = 6, score = 400
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   6a10                 | push                0x10
            //   e8????????           |                     
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_4 = { 75f9 2bc2 50 8d459c 8d8de4feffff e8???????? }
            // n = 6, score = 400
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   50                   | push                eax
            //   8d459c               | lea                 eax, [ebp - 0x64]
            //   8d8de4feffff         | lea                 ecx, [ebp - 0x11c]
            //   e8????????           |                     

        $sequence_5 = { 85f6 744d 8b8ddcfeffff bb10000000 395914 7202 8b09 }
            // n = 7, score = 400
            //   85f6                 | test                esi, esi
            //   744d                 | je                  0x4f
            //   8b8ddcfeffff         | mov                 ecx, dword ptr [ebp - 0x124]
            //   bb10000000           | mov                 ebx, 0x10
            //   395914               | cmp                 dword ptr [ecx + 0x14], ebx
            //   7202                 | jb                  4
            //   8b09                 | mov                 ecx, dword ptr [ecx]

        $sequence_6 = { 8b7dd0 8b450c 33f6 3975cc 7636 8b5014 }
            // n = 6, score = 400
            //   8b7dd0               | mov                 edi, dword ptr [ebp - 0x30]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   33f6                 | xor                 esi, esi
            //   3975cc               | cmp                 dword ptr [ebp - 0x34], esi
            //   7636                 | jbe                 0x38
            //   8b5014               | mov                 edx, dword ptr [eax + 0x14]

        $sequence_7 = { 33c0 5b 5d c20400 893e 8b4e0c 8d7e0c }
            // n = 7, score = 400
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   893e                 | mov                 dword ptr [esi], edi
            //   8b4e0c               | mov                 ecx, dword ptr [esi + 0xc]
            //   8d7e0c               | lea                 edi, [esi + 0xc]

        $sequence_8 = { e8???????? 83c408 85c0 0f85e50e0000 6a04 b8???????? }
            // n = 6, score = 400
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   0f85e50e0000         | jne                 0xeeb
            //   6a04                 | push                4
            //   b8????????           |                     

        $sequence_9 = { 8d4d84 51 8d957cfdffff 52 68???????? 8d8574fbffff }
            // n = 6, score = 400
            //   8d4d84               | lea                 ecx, [ebp - 0x7c]
            //   51                   | push                ecx
            //   8d957cfdffff         | lea                 edx, [ebp - 0x284]
            //   52                   | push                edx
            //   68????????           |                     
            //   8d8574fbffff         | lea                 eax, [ebp - 0x48c]

    condition:
        7 of them and filesize < 303104
}