rule win_gsecdump_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8be9 2bef 7510 8bce e8???????? 5f 5d }
            // n = 7, score = 100
            //   8be9                 | mov                 ebp, ecx
            //   2bef                 | sub                 ebp, edi
            //   7510                 | jne                 0x12
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

        $sequence_1 = { 7205 e8???????? 8b4704 8b3cf0 53 be0f000000 68???????? }
            // n = 7, score = 100
            //   7205                 | jb                  7
            //   e8????????           |                     
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   8b3cf0               | mov                 edi, dword ptr [eax + esi*8]
            //   53                   | push                ebx
            //   be0f000000           | mov                 esi, 0xf
            //   68????????           |                     

        $sequence_2 = { 8bc7 75ee 5f 8b4c2410 8b542414 8b4604 8b00 }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   75ee                 | jne                 0xfffffff0
            //   5f                   | pop                 edi
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8b00                 | mov                 eax, dword ptr [eax]

        $sequence_3 = { 33c4 898424a8000000 56 57 ff15???????? 8bf8 }
            // n = 6, score = 100
            //   33c4                 | xor                 eax, esp
            //   898424a8000000       | mov                 dword ptr [esp + 0xa8], eax
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_4 = { 85d2 8bea 7426 83f910 8bc2 7307 }
            // n = 6, score = 100
            //   85d2                 | test                edx, edx
            //   8bea                 | mov                 ebp, edx
            //   7426                 | je                  0x28
            //   83f910               | cmp                 ecx, 0x10
            //   8bc2                 | mov                 eax, edx
            //   7307                 | jae                 9

        $sequence_5 = { 56 8d4c2418 e8???????? 8b54246c 8d4c2414 51 52 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   e8????????           |                     
            //   8b54246c             | mov                 edx, dword ptr [esp + 0x6c]
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   51                   | push                ecx
            //   52                   | push                edx

        $sequence_6 = { 660dffff c3 ff742408 8b01 6aff ff74240c }
            // n = 6, score = 100
            //   660dffff             | or                  ax, 0xffff
            //   c3                   | ret                 
            //   ff742408             | push                dword ptr [esp + 8]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   6aff                 | push                -1
            //   ff74240c             | push                dword ptr [esp + 0xc]

        $sequence_7 = { 3bf0 7605 e8???????? 56 8d842488000000 50 8d44244c }
            // n = 7, score = 100
            //   3bf0                 | cmp                 esi, eax
            //   7605                 | jbe                 7
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d842488000000       | lea                 eax, [esp + 0x88]
            //   50                   | push                eax
            //   8d44244c             | lea                 eax, [esp + 0x4c]

        $sequence_8 = { e8???????? 8344241001 8b7c2420 33db e9???????? 83fe02 0f85a4000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8344241001           | add                 dword ptr [esp + 0x10], 1
            //   8b7c2420             | mov                 edi, dword ptr [esp + 0x20]
            //   33db                 | xor                 ebx, ebx
            //   e9????????           |                     
            //   83fe02               | cmp                 esi, 2
            //   0f85a4000000         | jne                 0xaa

        $sequence_9 = { 8b4c2424 394e04 751f 807f4000 0f8590fdffff 8b4c2414 }
            // n = 6, score = 100
            //   8b4c2424             | mov                 ecx, dword ptr [esp + 0x24]
            //   394e04               | cmp                 dword ptr [esi + 4], ecx
            //   751f                 | jne                 0x21
            //   807f4000             | cmp                 byte ptr [edi + 0x40], 0
            //   0f8590fdffff         | jne                 0xfffffd96
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]

    condition:
        7 of them and filesize < 630784
}