rule win_redyms_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { a1???????? 8d7828 57 894518 ffd3 83c8ff 8bce }
            // n = 7, score = 100
            //   a1????????           |                     
            //   8d7828               | lea                 edi, [eax + 0x28]
            //   57                   | push                edi
            //   894518               | mov                 dword ptr [ebp + 0x18], eax
            //   ffd3                 | call                ebx
            //   83c8ff               | or                  eax, 0xffffffff
            //   8bce                 | mov                 ecx, esi

        $sequence_1 = { 8945f8 ffd3 83c9ff 8bd6 f00fc10a 85c9 }
            // n = 6, score = 100
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   ffd3                 | call                ebx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   8bd6                 | mov                 edx, esi
            //   f00fc10a             | lock xadd           dword ptr [edx], ecx
            //   85c9                 | test                ecx, ecx

        $sequence_2 = { 8a0431 3c10 7506 c604312d eb05 0441 880431 }
            // n = 7, score = 100
            //   8a0431               | mov                 al, byte ptr [ecx + esi]
            //   3c10                 | cmp                 al, 0x10
            //   7506                 | jne                 8
            //   c604312d             | mov                 byte ptr [ecx + esi], 0x2d
            //   eb05                 | jmp                 7
            //   0441                 | add                 al, 0x41
            //   880431               | mov                 byte ptr [ecx + esi], al

        $sequence_3 = { 8bc7 83f05b 014508 47 3bfb 72ca 8d4b04 }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   83f05b               | xor                 eax, 0x5b
            //   014508               | add                 dword ptr [ebp + 8], eax
            //   47                   | inc                 edi
            //   3bfb                 | cmp                 edi, ebx
            //   72ca                 | jb                  0xffffffcc
            //   8d4b04               | lea                 ecx, [ebx + 4]

        $sequence_4 = { 8d1c9d10000000 833c0b00 0f85b2feffff 5e 5b 8be5 5d }
            // n = 7, score = 100
            //   8d1c9d10000000       | lea                 ebx, [ebx*4 + 0x10]
            //   833c0b00             | cmp                 dword ptr [ebx + ecx], 0
            //   0f85b2feffff         | jne                 0xfffffeb8
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_5 = { 50 56 ff15???????? 8975f8 85f6 747b 8b450c }
            // n = 7, score = 100
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   85f6                 | test                esi, esi
            //   747b                 | je                  0x7d
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_6 = { 8b35???????? 8d4dec 8bd1 33c0 c645eb00 2bf2 8a140e }
            // n = 7, score = 100
            //   8b35????????         |                     
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   8bd1                 | mov                 edx, ecx
            //   33c0                 | xor                 eax, eax
            //   c645eb00             | mov                 byte ptr [ebp - 0x15], 0
            //   2bf2                 | sub                 esi, edx
            //   8a140e               | mov                 dl, byte ptr [esi + ecx]

        $sequence_7 = { 8d7828 57 8945f8 ffd3 83caff 8bc6 f00fc110 }
            // n = 7, score = 100
            //   8d7828               | lea                 edi, [eax + 0x28]
            //   57                   | push                edi
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   ffd3                 | call                ebx
            //   83caff               | or                  edx, 0xffffffff
            //   8bc6                 | mov                 eax, esi
            //   f00fc110             | lock xadd           dword ptr [eax], edx

        $sequence_8 = { 50 ff15???????? 57 ff15???????? 8b4dfc 8b1d???????? 51 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b1d????????         |                     
            //   51                   | push                ecx

        $sequence_9 = { 8d7828 57 c745bce479f403 8bf0 ffd3 8d45a8 }
            // n = 6, score = 100
            //   8d7828               | lea                 edi, [eax + 0x28]
            //   57                   | push                edi
            //   c745bce479f403       | mov                 dword ptr [ebp - 0x44], 0x3f479e4
            //   8bf0                 | mov                 esi, eax
            //   ffd3                 | call                ebx
            //   8d45a8               | lea                 eax, [ebp - 0x58]

    condition:
        7 of them and filesize < 98304
}