rule win_redyms_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.redyms."
        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.redyms"
        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 = { 7406 837e0c00 750b 5f b001 5e }
            // n = 6, score = 100
            //   7406                 | je                  8
            //   837e0c00             | cmp                 dword ptr [esi + 0xc], 0
            //   750b                 | jne                 0xd
            //   5f                   | pop                 edi
            //   b001                 | mov                 al, 1
            //   5e                   | pop                 esi

        $sequence_1 = { 8855f9 2bf3 8a1c0e 32d8 80f3c0 8819 40 }
            // n = 7, score = 100
            //   8855f9               | mov                 byte ptr [ebp - 7], dl
            //   2bf3                 | sub                 esi, ebx
            //   8a1c0e               | mov                 bl, byte ptr [esi + ecx]
            //   32d8                 | xor                 bl, al
            //   80f3c0               | xor                 bl, 0xc0
            //   8819                 | mov                 byte ptr [ecx], bl
            //   40                   | inc                 eax

        $sequence_2 = { 50 6a00 ffd7 50 ffd6 8b4318 85c0 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8975e8 8945f0 ffd3 8945f4 3bc6 }
            // n = 5, score = 100
            //   8975e8               | mov                 dword ptr [ebp - 0x18], esi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   ffd3                 | call                ebx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   3bc6                 | cmp                 eax, esi

        $sequence_4 = { 8b1d???????? 85c0 751b 8b45c4 6a01 68???????? 6a01 }
            // n = 7, score = 100
            //   8b1d????????         |                     
            //   85c0                 | test                eax, eax
            //   751b                 | jne                 0x1d
            //   8b45c4               | mov                 eax, dword ptr [ebp - 0x3c]
            //   6a01                 | push                1
            //   68????????           |                     
            //   6a01                 | push                1

        $sequence_5 = { 56 6a00 ff15???????? 50 ff15???????? 807dff00 7510 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   807dff00             | cmp                 byte ptr [ebp - 1], 0
            //   7510                 | jne                 0x12

        $sequence_6 = { 50 6a01 6a00 8d4de8 51 52 ff15???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_7 = { 8bf0 83c408 85f6 743c a1???????? }
            // n = 5, score = 100
            //   8bf0                 | mov                 esi, eax
            //   83c408               | add                 esp, 8
            //   85f6                 | test                esi, esi
            //   743c                 | je                  0x3e
            //   a1????????           |                     

        $sequence_8 = { ff15???????? 8b4d08 6a00 68???????? 68???????? 51 56 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   6a00                 | push                0
            //   68????????           |                     
            //   68????????           |                     
            //   51                   | push                ecx
            //   56                   | push                esi

        $sequence_9 = { 8bec 83ec18 53 56 57 8bd8 c645f400 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83ec18               | sub                 esp, 0x18
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bd8                 | mov                 ebx, eax
            //   c645f400             | mov                 byte ptr [ebp - 0xc], 0

    condition:
        7 of them and filesize < 98304
}