rule win_cueisfry_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8d4508 50 e8???????? 8b08 c645fc05 3bcf }
            // n = 6, score = 100
            //   8d4508               | lea                 eax, [ebp + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   c645fc05             | mov                 byte ptr [ebp - 4], 5
            //   3bcf                 | cmp                 ecx, edi

        $sequence_1 = { b910000000 8d7c241c f3a5 8d4c241c 68???????? }
            // n = 5, score = 100
            //   b910000000           | mov                 ecx, 0x10
            //   8d7c241c             | lea                 edi, [esp + 0x1c]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   68????????           |                     

        $sequence_2 = { 89742424 c1e902 f3ab 8bca }
            // n = 4, score = 100
            //   89742424             | mov                 dword ptr [esp + 0x24], esi
            //   c1e902               | shr                 ecx, 2
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8bca                 | mov                 ecx, edx

        $sequence_3 = { 66ab 8d8c24d0010000 51 68f4010000 aa ff15???????? }
            // n = 6, score = 100
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   8d8c24d0010000       | lea                 ecx, [esp + 0x1d0]
            //   51                   | push                ecx
            //   68f4010000           | push                0x1f4
            //   aa                   | stosb               byte ptr es:[edi], al
            //   ff15????????         |                     

        $sequence_4 = { 88542418 0f84c1000000 8d4c2414 e8???????? }
            // n = 4, score = 100
            //   88542418             | mov                 byte ptr [esp + 0x18], dl
            //   0f84c1000000         | je                  0xc7
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   e8????????           |                     

        $sequence_5 = { 7cf4 eb04 885c0428 8d4c2410 }
            // n = 4, score = 100
            //   7cf4                 | jl                  0xfffffff6
            //   eb04                 | jmp                 6
            //   885c0428             | mov                 byte ptr [esp + eax + 0x28], bl
            //   8d4c2410             | lea                 ecx, [esp + 0x10]

        $sequence_6 = { 8be5 5d c3 ff15???????? 8b45ec 85c0 }
            // n = 6, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   ff15????????         |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   85c0                 | test                eax, eax

        $sequence_7 = { 33c0 8d7c2429 be???????? f3ab }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   8d7c2429             | lea                 edi, [esp + 0x29]
            //   be????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_8 = { ff15???????? 8bf0 85f6 0f84c1000000 57 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   0f84c1000000         | je                  0xc7
            //   57                   | push                edi

        $sequence_9 = { 33c0 8dbc24d1010000 889c24d0010000 f3ab 66ab 8d8c24d0010000 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   8dbc24d1010000       | lea                 edi, [esp + 0x1d1]
            //   889c24d0010000       | mov                 byte ptr [esp + 0x1d0], bl
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   8d8c24d0010000       | lea                 ecx, [esp + 0x1d0]

    condition:
        7 of them and filesize < 81920
}