rule win_gsecdump_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.gsecdump."
        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.gsecdump"
        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 = { e8???????? 83c404 c746180f000000 c7461400000000 c6460400 8b4c240c 64890d00000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c746180f000000       | mov                 dword ptr [esi + 0x18], 0xf
            //   c7461400000000       | mov                 dword ptr [esi + 0x14], 0
            //   c6460400             | mov                 byte ptr [esi + 4], 0
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_1 = { 8d842490000000 64a300000000 8bbc24a0000000 33c0 89442420 c747180f000000 894714 }
            // n = 7, score = 100
            //   8d842490000000       | lea                 eax, [esp + 0x90]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8bbc24a0000000       | mov                 edi, dword ptr [esp + 0xa0]
            //   33c0                 | xor                 eax, eax
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   c747180f000000       | mov                 dword ptr [edi + 0x18], 0xf
            //   894714               | mov                 dword ptr [edi + 0x14], eax

        $sequence_2 = { 7404 c6450b01 f6c310 7425 83e3ef 397dec 895d04 }
            // n = 7, score = 100
            //   7404                 | je                  6
            //   c6450b01             | mov                 byte ptr [ebp + 0xb], 1
            //   f6c310               | test                bl, 0x10
            //   7425                 | je                  0x27
            //   83e3ef               | and                 ebx, 0xffffffef
            //   397dec               | cmp                 dword ptr [ebp - 0x14], edi
            //   895d04               | mov                 dword ptr [ebp + 4], ebx

        $sequence_3 = { eb0d 85c9 7466 a80c 7562 ba???????? }
            // n = 6, score = 100
            //   eb0d                 | jmp                 0xf
            //   85c9                 | test                ecx, ecx
            //   7466                 | je                  0x68
            //   a80c                 | test                al, 0xc
            //   7562                 | jne                 0x64
            //   ba????????           |                     

        $sequence_4 = { 8d44246c 64a300000000 c744240800000000 8b01 85c0 7517 8d4c240c }
            // n = 7, score = 100
            //   8d44246c             | lea                 eax, [esp + 0x6c]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   85c0                 | test                eax, eax
            //   7517                 | jne                 0x19
            //   8d4c240c             | lea                 ecx, [esp + 0xc]

        $sequence_5 = { c744244007000000 c744243c00000000 66c744242c0000 e8???????? 68???????? 8d542424 52 }
            // n = 7, score = 100
            //   c744244007000000     | mov                 dword ptr [esp + 0x40], 7
            //   c744243c00000000     | mov                 dword ptr [esp + 0x3c], 0
            //   66c744242c0000       | mov                 word ptr [esp + 0x2c], 0
            //   e8????????           |                     
            //   68????????           |                     
            //   8d542424             | lea                 edx, [esp + 0x24]
            //   52                   | push                edx

        $sequence_6 = { 8b4d0c 8901 33c0 40 e9???????? 8365d800 c745dc874f4100 }
            // n = 7, score = 100
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   e9????????           |                     
            //   8365d800             | and                 dword ptr [ebp - 0x28], 0
            //   c745dc874f4100       | mov                 dword ptr [ebp - 0x24], 0x414f87

        $sequence_7 = { e8???????? 8d4c2410 c744240801000000 c684248c00000000 e8???????? 8bc6 8b8c2484000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   c744240801000000     | mov                 dword ptr [esp + 8], 1
            //   c684248c00000000     | mov                 byte ptr [esp + 0x8c], 0
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   8b8c2484000000       | mov                 ecx, dword ptr [esp + 0x84]

        $sequence_8 = { 02447c1c 85ff 8846ff 743d 3b742444 743d }
            // n = 6, score = 100
            //   02447c1c             | add                 al, byte ptr [esp + edi*2 + 0x1c]
            //   85ff                 | test                edi, edi
            //   8846ff               | mov                 byte ptr [esi - 1], al
            //   743d                 | je                  0x3f
            //   3b742444             | cmp                 esi, dword ptr [esp + 0x44]
            //   743d                 | je                  0x3f

        $sequence_9 = { 8bc1 c1f805 8d3c85a09b4400 8b07 03c6 }
            // n = 5, score = 100
            //   8bc1                 | mov                 eax, ecx
            //   c1f805               | sar                 eax, 5
            //   8d3c85a09b4400       | lea                 edi, [eax*4 + 0x449ba0]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   03c6                 | add                 eax, esi

    condition:
        7 of them and filesize < 630784
}