rule win_cueisfry_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.cueisfry."
        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.cueisfry"
        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 = { c3 8b4c2418 8d442408 50 }
            // n = 4, score = 100
            //   c3                   | ret                 
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   8d442408             | lea                 eax, [esp + 8]
            //   50                   | push                eax

        $sequence_1 = { 8d8424a4020000 50 6804010000 ff15???????? }
            // n = 4, score = 100
            //   8d8424a4020000       | lea                 eax, [esp + 0x2a4]
            //   50                   | push                eax
            //   6804010000           | push                0x104
            //   ff15????????         |                     

        $sequence_2 = { 66ab 8d4c242c 6800010000 51 6a00 aa }
            // n = 6, score = 100
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   8d4c242c             | lea                 ecx, [esp + 0x2c]
            //   6800010000           | push                0x100
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_3 = { 7541 397dec 750a 6803400080 }
            // n = 4, score = 100
            //   7541                 | jne                 0x43
            //   397dec               | cmp                 dword ptr [ebp - 0x14], edi
            //   750a                 | jne                 0xc
            //   6803400080           | push                0x80004003

        $sequence_4 = { 889c24c0010000 e8???????? 83c40c 85c0 7f37 8d4c2414 }
            // n = 6, score = 100
            //   889c24c0010000       | mov                 byte ptr [esp + 0x1c0], bl
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7f37                 | jg                  0x39
            //   8d4c2414             | lea                 ecx, [esp + 0x14]

        $sequence_5 = { 8d45c8 50 c645fc01 ff15???????? 3bc7 }
            // n = 5, score = 100
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   50                   | push                eax
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   ff15????????         |                     
            //   3bc7                 | cmp                 eax, edi

        $sequence_6 = { 8bee 33ff 85c9 89542430 896c2410 0f8ebd010000 }
            // n = 6, score = 100
            //   8bee                 | mov                 ebp, esi
            //   33ff                 | xor                 edi, edi
            //   85c9                 | test                ecx, ecx
            //   89542430             | mov                 dword ptr [esp + 0x30], edx
            //   896c2410             | mov                 dword ptr [esp + 0x10], ebp
            //   0f8ebd010000         | jle                 0x1c3

        $sequence_7 = { c3 8b45ec c745fcffffffff 85c0 7406 8b10 }
            // n = 6, score = 100
            //   c3                   | ret                 
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   8b10                 | mov                 edx, dword ptr [eax]

        $sequence_8 = { 64890d00000000 81c4b4070000 c3 8b8c24c0070000 8d442408 }
            // n = 5, score = 100
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   81c4b4070000         | add                 esp, 0x7b4
            //   c3                   | ret                 
            //   8b8c24c0070000       | mov                 ecx, dword ptr [esp + 0x7c0]
            //   8d442408             | lea                 eax, [esp + 8]

        $sequence_9 = { 50 8975dc e8???????? 8b45ec }
            // n = 4, score = 100
            //   50                   | push                eax
            //   8975dc               | mov                 dword ptr [ebp - 0x24], esi
            //   e8????????           |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

    condition:
        7 of them and filesize < 81920
}