rule win_saigon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 488bf1 488d4c2420 488bd5 e8???????? }
            // n = 4, score = 200
            //   488bf1               | dec                 eax
            //   488d4c2420           | mov                 ecx, dword ptr [esi]
            //   488bd5               | dec                 esp
            //   e8????????           |                     

        $sequence_1 = { 448bc7 895c2420 e8???????? 488d842450010000 4c8d842420040000 488d9424b0040000 488d8c2400030000 }
            // n = 7, score = 200
            //   448bc7               | lea                 eax, [eax + eax*2 + 0x24]
            //   895c2420             | cmp                 eax, esi
            //   e8????????           |                     
            //   488d842450010000     | je                  0xfffffdc8
            //   4c8d842420040000     | cmp                 eax, 1
            //   488d9424b0040000     | jbe                 0x58
            //   488d8c2400030000     | mov                 dword ptr [esp + 0x20], esi

        $sequence_2 = { 488364243000 4533c0 488bd3 33c9 c744242800000008 8364242000 c784248000000068000000 }
            // n = 7, score = 200
            //   488364243000         | dec                 ebp
            //   4533c0               | mov                 ebx, eax
            //   488bd3               | inc                 esp
            //   33c9                 | mov                 ecx, edx
            //   c744242800000008     | inc                 ecx
            //   8364242000           | pop                 esp
            //   c784248000000068000000     | ret    

        $sequence_3 = { 488d442454 4c8d442470 418d5112 488bcb 4889442420 ff15???????? }
            // n = 6, score = 200
            //   488d442454           | mov                 ecx, eax
            //   4c8d442470           | dec                 eax
            //   418d5112             | mov                 ebx, dword ptr [esp + 0x60]
            //   488bcb               | dec                 eax
            //   4889442420           | test                eax, eax
            //   ff15????????         |                     

        $sequence_4 = { 488d842470020000 4c8d842440050000 488d942490030000 488d8c24c0000000 448bcb 895c2428 }
            // n = 6, score = 200
            //   488d842470020000     | dec                 eax
            //   4c8d842440050000     | lea                 edx, [esp + 0x168]
            //   488d942490030000     | dec                 eax
            //   488d8c24c0000000     | lea                 ecx, [0xd057]
            //   448bcb               | dec                 eax
            //   895c2428             | mov                 dword ptr [esp + 0x118], eax

        $sequence_5 = { 488d542430 488d4c2430 895c2420 e8???????? 4c8d842470020000 }
            // n = 5, score = 200
            //   488d542430           | js                  0x587
            //   488d4c2430           | dec                 eax
            //   895c2420             | mov                 ecx, dword ptr [esp + 0x50]
            //   e8????????           |                     
            //   4c8d842470020000     | dec                 eax

        $sequence_6 = { 488b8c2498000000 4c8d842490000000 33d2 488b01 }
            // n = 4, score = 200
            //   488b8c2498000000     | dec                 eax
            //   4c8d842490000000     | mov                 ecx, dword ptr [esi]
            //   33d2                 | dec                 esp
            //   488b01               | lea                 eax, [esp + 0x70]

        $sequence_7 = { e8???????? bf26000000 3bc6 0f44c7 8bd8 e9???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   bf26000000           | je                  0x1a43
            //   3bc6                 | mov                 ebx, 0x57
            //   0f44c7               | mov                 edx, dword ptr [eax + ebp + 0x50]
            //   8bd8                 | inc                 esp
            //   e9????????           |                     

        $sequence_8 = { 488b0d???????? 33d2 ff15???????? 488b0d???????? 4d8bc4 33d2 }
            // n = 6, score = 200
            //   488b0d????????       |                     
            //   33d2                 | and                 dword ptr [ebx + 0x18], 0
            //   ff15????????         |                     
            //   488b0d????????       |                     
            //   4d8bc4               | dec                 eax
            //   33d2                 | arpl                word ptr [ecx + 0x3c], bx

        $sequence_9 = { 8b9424b0000000 eb52 8364242800 488d442460 }
            // n = 4, score = 200
            //   8b9424b0000000       | push                edi
            //   eb52                 | dec                 eax
            //   8364242800           | sub                 esp, 0x60
            //   488d442460           | and                 dword ptr [eax + 0x20], 0

    condition:
        7 of them and filesize < 147456
}