rule win_glassrat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.glassrat."
        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.glassrat"
        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 = { 8d85e4feffff 52 53 53 }
            // n = 4, score = 200
            //   8d85e4feffff         | lea                 eax, [ebp - 0x11c]
            //   52                   | push                edx
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_1 = { 8d4c2420 c68424f402000001 e8???????? 8d4c2418 }
            // n = 4, score = 200
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   c68424f402000001     | mov                 byte ptr [esp + 0x2f4], 1
            //   e8????????           |                     
            //   8d4c2418             | lea                 ecx, [esp + 0x18]

        $sequence_2 = { f3ab 66ab 8d8c24cc040000 51 8bce aa e8???????? }
            // n = 7, score = 200
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   8d8c24cc040000       | lea                 ecx, [esp + 0x4cc]
            //   51                   | push                ecx
            //   8bce                 | mov                 ecx, esi
            //   aa                   | stosb               byte ptr es:[edi], al
            //   e8????????           |                     

        $sequence_3 = { 8b4c2408 81ec14010000 8bc1 83e802 }
            // n = 4, score = 200
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   81ec14010000         | sub                 esp, 0x114
            //   8bc1                 | mov                 eax, ecx
            //   83e802               | sub                 eax, 2

        $sequence_4 = { 8965f0 8bc1 8bf7 8bfa 8d930c020000 }
            // n = 5, score = 200
            //   8965f0               | mov                 dword ptr [ebp - 0x10], esp
            //   8bc1                 | mov                 eax, ecx
            //   8bf7                 | mov                 esi, edi
            //   8bfa                 | mov                 edi, edx
            //   8d930c020000         | lea                 edx, [ebx + 0x20c]

        $sequence_5 = { 8be5 5d c3 8b460c 3bc3 }
            // n = 5, score = 200
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   3bc3                 | cmp                 eax, ebx

        $sequence_6 = { 5d 81c4b0010000 c20800 8d4c241c }
            // n = 4, score = 200
            //   5d                   | pop                 ebp
            //   81c4b0010000         | add                 esp, 0x1b0
            //   c20800               | ret                 8
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]

        $sequence_7 = { 8944241d 8d4c241c 89442421 c644241c00 89442425 }
            // n = 5, score = 200
            //   8944241d             | mov                 dword ptr [esp + 0x1d], eax
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   89442421             | mov                 dword ptr [esp + 0x21], eax
            //   c644241c00           | mov                 byte ptr [esp + 0x1c], 0
            //   89442425             | mov                 dword ptr [esp + 0x25], eax

        $sequence_8 = { e8???????? 8dbc24cc040000 b801000000 57 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   8dbc24cc040000       | lea                 edi, [esp + 0x4cc]
            //   b801000000           | mov                 eax, 1
            //   57                   | push                edi

        $sequence_9 = { 6a00 ff15???????? a1???????? 8b15???????? 8b0d???????? 89442408 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8b15????????         |                     
            //   8b0d????????         |                     
            //   89442408             | mov                 dword ptr [esp + 8], eax

    condition:
        7 of them and filesize < 81920
}