rule win_crenufs_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.crenufs."
        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.crenufs"
        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 = { 85c0 8945f8 0f8494000000 53 57 8b3d???????? }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0f8494000000         | je                  0x9a
            //   53                   | push                ebx
            //   57                   | push                edi
            //   8b3d????????         |                     

        $sequence_1 = { eb08 894c2418 8d442418 3928 750f 8d442420 }
            // n = 6, score = 200
            //   eb08                 | jmp                 0xa
            //   894c2418             | mov                 dword ptr [esp + 0x18], ecx
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   3928                 | cmp                 dword ptr [eax], ebp
            //   750f                 | jne                 0x11
            //   8d442420             | lea                 eax, [esp + 0x20]

        $sequence_2 = { 6a00 8d4608 51 6a04 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   8d4608               | lea                 eax, [esi + 8]
            //   51                   | push                ecx
            //   6a04                 | push                4

        $sequence_3 = { 49 51 e8???????? 83c404 8b8c2424040000 }
            // n = 5, score = 200
            //   49                   | dec                 ecx
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b8c2424040000       | mov                 ecx, dword ptr [esp + 0x424]

        $sequence_4 = { 6a04 51 52 ffd5 8d7e18 }
            // n = 5, score = 200
            //   6a04                 | push                4
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ffd5                 | call                ebp
            //   8d7e18               | lea                 edi, [esi + 0x18]

        $sequence_5 = { 50 e8???????? a1???????? 59 8d4de0 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   a1????????           |                     
            //   59                   | pop                 ecx
            //   8d4de0               | lea                 ecx, [ebp - 0x20]

        $sequence_6 = { 8944242c ffd5 8b5304 8d442410 6a00 50 }
            // n = 6, score = 200
            //   8944242c             | mov                 dword ptr [esp + 0x2c], eax
            //   ffd5                 | call                ebp
            //   8b5304               | mov                 edx, dword ptr [ebx + 4]
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_7 = { 8d4c2430 e8???????? 39742414 75da 8b4c242c 51 e8???????? }
            // n = 7, score = 200
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   e8????????           |                     
            //   39742414             | cmp                 dword ptr [esp + 0x14], esi
            //   75da                 | jne                 0xffffffdc
            //   8b4c242c             | mov                 ecx, dword ptr [esp + 0x2c]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_8 = { 8b4d0c 50 8d85dcfbffff 50 }
            // n = 4, score = 200
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   50                   | push                eax
            //   8d85dcfbffff         | lea                 eax, [ebp - 0x424]
            //   50                   | push                eax

        $sequence_9 = { 64890d00000000 c9 c3 b8???????? e8???????? 81ec6c050000 53 }
            // n = 7, score = 200
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   b8????????           |                     
            //   e8????????           |                     
            //   81ec6c050000         | sub                 esp, 0x56c
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 106496
}