rule win_xfscashncr_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.xfscashncr."
        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.xfscashncr"
        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 = { 89959cfbffff 83bd9cfbffff10 776a 8b859cfbffff 0fb688502c5100 ff248d382c5100 8b95f8fbffff }
            // n = 7, score = 100
            //   89959cfbffff         | mov                 dword ptr [ebp - 0x464], edx
            //   83bd9cfbffff10       | cmp                 dword ptr [ebp - 0x464], 0x10
            //   776a                 | ja                  0x6c
            //   8b859cfbffff         | mov                 eax, dword ptr [ebp - 0x464]
            //   0fb688502c5100       | movzx               ecx, byte ptr [eax + 0x512c50]
            //   ff248d382c5100       | jmp                 dword ptr [ecx*4 + 0x512c38]
            //   8b95f8fbffff         | mov                 edx, dword ptr [ebp - 0x408]

        $sequence_1 = { 83e21f c1e206 8b0485c0195700 8a4c1024 80e180 8b550c 8b02 }
            // n = 7, score = 100
            //   83e21f               | and                 edx, 0x1f
            //   c1e206               | shl                 edx, 6
            //   8b0485c0195700       | mov                 eax, dword ptr [eax*4 + 0x5719c0]
            //   8a4c1024             | mov                 cl, byte ptr [eax + edx + 0x24]
            //   80e180               | and                 cl, 0x80
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   8b02                 | mov                 eax, dword ptr [edx]

        $sequence_2 = { 66891401 ba02000000 6bd203 0fb745f0 8b4de4 0fb71411 0bd0 }
            // n = 7, score = 100
            //   66891401             | mov                 word ptr [ecx + eax], dx
            //   ba02000000           | mov                 edx, 2
            //   6bd203               | imul                edx, edx, 3
            //   0fb745f0             | movzx               eax, word ptr [ebp - 0x10]
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   0fb71411             | movzx               edx, word ptr [ecx + edx]
            //   0bd0                 | or                  edx, eax

        $sequence_3 = { 894584 837d840a 7344 837d8c24 7c0b 8b4d80 83c101 }
            // n = 7, score = 100
            //   894584               | mov                 dword ptr [ebp - 0x7c], eax
            //   837d840a             | cmp                 dword ptr [ebp - 0x7c], 0xa
            //   7344                 | jae                 0x46
            //   837d8c24             | cmp                 dword ptr [ebp - 0x74], 0x24
            //   7c0b                 | jl                  0xd
            //   8b4d80               | mov                 ecx, dword ptr [ebp - 0x80]
            //   83c101               | add                 ecx, 1

        $sequence_4 = { f3ab 59 894df8 8b45f8 83785000 7446 }
            // n = 6, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   59                   | pop                 ecx
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83785000             | cmp                 dword ptr [eax + 0x50], 0
            //   7446                 | je                  0x48

        $sequence_5 = { 8b08 8b5104 83ea60 8b45ec 8b08 8b4104 8b4dec }
            // n = 7, score = 100
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b5104               | mov                 edx, dword ptr [ecx + 4]
            //   83ea60               | sub                 edx, 0x60
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b4104               | mov                 eax, dword ptr [ecx + 4]
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]

        $sequence_6 = { 8bcd 50 8d15c4ba4700 e8???????? 58 }
            // n = 5, score = 100
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d15c4ba4700         | lea                 edx, [0x47bac4]
            //   e8????????           |                     
            //   58                   | pop                 eax

        $sequence_7 = { 50 e8???????? 83c404 83c001 8b4d08 8901 837d0c00 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83c001               | add                 eax, 1
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0

        $sequence_8 = { c7410400000000 8d4de8 e8???????? 52 8bcd 50 8d1594034800 }
            // n = 7, score = 100
            //   c7410400000000       | mov                 dword ptr [ecx + 4], 0
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   e8????????           |                     
            //   52                   | push                edx
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d1594034800         | lea                 edx, [0x480394]

        $sequence_9 = { 51 8b55f4 8b4248 50 8b4d08 e8???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   8b4248               | mov                 eax, dword ptr [edx + 0x48]
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 3126272
}