rule win_saigon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.saigon."
        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.saigon"
        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 = { 4c8bc0 488bce ff15???????? 488b0d???????? }
            // n = 4, score = 200
            //   4c8bc0               | lea                 ecx, [esp + 0x60]
            //   488bce               | dec                 eax
            //   ff15????????         |                     
            //   488b0d????????       |                     

        $sequence_1 = { 7467 488bc8 ff15???????? 498bcc 8bd8 ff15???????? }
            // n = 6, score = 200
            //   7467                 | lea                 ecx, [esp + 0x4c]
            //   488bc8               | dec                 esp
            //   ff15????????         |                     
            //   498bcc               | lea                 eax, [esp + 0xe0]
            //   8bd8                 | dec                 eax
            //   ff15????????         |                     

        $sequence_2 = { bf08000000 33f6 488b0d???????? 4c8bc3 33d2 ff15???????? }
            // n = 6, score = 200
            //   bf08000000           | mov                 eax, ebx
            //   33f6                 | xor                 edx, edx
            //   488b0d????????       |                     
            //   4c8bc3               | dec                 eax
            //   33d2                 | lea                 ecx, [esp + 0x660]
            //   ff15????????         |                     

        $sequence_3 = { f08386b0000000ff 4d85e4 0f84f8000000 488d8e88000000 ff15???????? f04401b6b0000000 488d8e88000000 }
            // n = 7, score = 200
            //   f08386b0000000ff     | dec                 eax
            //   4d85e4               | mov                 ecx, eax
            //   0f84f8000000         | je                  0xef0
            //   488d8e88000000       | dec                 eax
            //   ff15????????         |                     
            //   f04401b6b0000000     | lea                 edx, [0x9a9e]
            //   488d8e88000000       | dec                 ebp

        $sequence_4 = { 4c8bc6 33d2 ff15???????? 4c8bc5 488b0d???????? 33d2 ff15???????? }
            // n = 7, score = 200
            //   4c8bc6               | inc                 ecx
            //   33d2                 | cmove               ebx, edi
            //   ff15????????         |                     
            //   4c8bc5               | cmp                 ebx, esi
            //   488b0d????????       |                     
            //   33d2                 | jne                 0x1856
            //   ff15????????         |                     

        $sequence_5 = { e8???????? 488d842470020000 4c8d842440050000 488d942490030000 488d8c24c0000000 448bcb 895c2428 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   488d842470020000     | mov                 ebp, eax
            //   4c8d842440050000     | jne                 0x1ea0
            //   488d942490030000     | xor                 edx, edx
            //   488d8c24c0000000     | dec                 esp
            //   448bcb               | mov                 eax, esi
            //   895c2428             | dec                 esp

        $sequence_6 = { 488bd8 83f820 410f4fdb 493bfb 7412 488b0d???????? 4c8bc7 }
            // n = 7, score = 200
            //   488bd8               | dec                 ebp
            //   83f820               | mov                 ecx, esp
            //   410f4fdb             | inc                 esp
            //   493bfb               | mov                 eax, ebp
            //   7412                 | dec                 eax
            //   488b0d????????       |                     
            //   4c8bc7               | mov                 edi, eax

        $sequence_7 = { 488d8c2440050000 4c8bc3 33d2 e8???????? 488d8c2400030000 4c8bc3 }
            // n = 6, score = 200
            //   488d8c2440050000     | dec                 esp
            //   4c8bc3               | mov                 eax, edi
            //   33d2                 | dec                 esp
            //   e8????????           |                     
            //   488d8c2400030000     | mov                 ebp, eax
            //   4c8bc3               | inc                 ebp

        $sequence_8 = { 8bd8 488bcf ff15???????? eb08 ff15???????? 8bd8 4c8d9c2480010000 }
            // n = 7, score = 200
            //   8bd8                 | inc                 esp
            //   488bcf               | mov                 ecx, ebx
            //   ff15????????         |                     
            //   eb08                 | inc                 ecx
            //   ff15????????         |                     
            //   8bd8                 | mov                 edx, esi
            //   4c8d9c2480010000     | dec                 esp

        $sequence_9 = { 7428 4c8d442450 488d542430 488bc8 e8???????? }
            // n = 5, score = 200
            //   7428                 | je                  0x90d
            //   4c8d442450           | dec                 eax
            //   488d542430           | mov                 ecx, ebx
            //   488bc8               | dec                 eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 147456
}