rule win_whiskerspy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.whiskerspy."
        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.whiskerspy"
        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 = { 33ff 8b06 8bcf d3e8 }
            // n = 4, score = 300
            //   33ff                 | xor                 edi, edi
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8bcf                 | mov                 ecx, edi
            //   d3e8                 | shr                 eax, cl

        $sequence_1 = { 7409 e8???????? 448b430c 4963c8 }
            // n = 4, score = 200
            //   7409                 | int                 0x29
            //   e8????????           |                     
            //   448b430c             | dec                 eax
            //   4963c8               | lea                 ecx, [0xdee6]

        $sequence_2 = { 7408 488bce e8???????? ba01000000 8bca e8???????? 488bf0 }
            // n = 7, score = 200
            //   7408                 | je                  0xa
            //   488bce               | dec                 eax
            //   e8????????           |                     
            //   ba01000000           | mov                 ecx, esi
            //   8bca                 | mov                 edx, 1
            //   e8????????           |                     
            //   488bf0               | mov                 ecx, edx

        $sequence_3 = { 7408 8b442430 8bc8 cd29 488d0de6de0000 }
            // n = 5, score = 200
            //   7408                 | arpl                bx, cx
            //   8b442430             | mov                 edx, 1
            //   8bc8                 | je                  0xa
            //   cd29                 | dec                 ecx
            //   488d0de6de0000       | mov                 ecx, esi

        $sequence_4 = { 7408 e8???????? 8b430c 4863c8 }
            // n = 4, score = 200
            //   7408                 | je                  0xa
            //   e8????????           |                     
            //   8b430c               | dec                 ecx
            //   4863c8               | mov                 ecx, esi

        $sequence_5 = { 7409 48ffc1 66833900 75f7 }
            // n = 4, score = 200
            //   7409                 | je                  0xa
            //   48ffc1               | dec                 ecx
            //   66833900             | mov                 ecx, esi
            //   75f7                 | mov                 byte ptr [ebp + 0xb18], 0x9a

        $sequence_6 = { 7408 498bce e8???????? 488bd3 }
            // n = 4, score = 200
            //   7408                 | mov                 ecx, ebp
            //   498bce               | mov                 edx, 1
            //   e8????????           |                     
            //   488bd3               | dec                 ecx

        $sequence_7 = { 7408 488bcf e8???????? ba02000000 }
            // n = 4, score = 200
            //   7408                 | dec                 eax
            //   488bcf               | mov                 esi, eax
            //   e8????????           |                     
            //   ba02000000           | je                  0xa

        $sequence_8 = { 015dd0 eb09 51 8d4dcc }
            // n = 4, score = 100
            //   015dd0               | arpl                ax, cx
            //   eb09                 | mov                 edx, 2
            //   51                   | je                  0xb
            //   8d4dcc               | inc                 esp

        $sequence_9 = { 0175d0 eb0c 51 8d4dcc }
            // n = 4, score = 100
            //   0175d0               | jg                  0xffffff72
            //   eb0c                 | jl                  0x10
            //   51                   | add                 dword ptr [ebp + 8], edx
            //   8d4dcc               | test                edi, edi

        $sequence_10 = { 0144241c 2bd8 83c410 8bd3 }
            // n = 4, score = 100
            //   0144241c             | dec                 eax
            //   2bd8                 | inc                 ecx
            //   83c410               | cmp                 word ptr [ecx], 0
            //   8bd3                 | jne                 0

        $sequence_11 = { 015de8 eb09 50 8d4de4 }
            // n = 4, score = 100
            //   015de8               | mov                 ecx, edi
            //   eb09                 | shr                 eax, cl
            //   50                   | mov                 eax, dword ptr [esi]
            //   8d4de4               | mov                 ecx, edi

        $sequence_12 = { 01742418 83c40c 8b412c 2930 }
            // n = 4, score = 100
            //   01742418             | add                 esp, 0x10
            //   83c40c               | mov                 edx, ebx
            //   8b412c               | add                 dword ptr [esp + 0x1c], eax
            //   2930                 | sub                 ebx, eax

        $sequence_13 = { 015508 85ff 0f8f6cffffff 7c08 }
            // n = 4, score = 100
            //   015508               | mov                 eax, dword ptr [ebx + 0xc]
            //   85ff                 | dec                 ecx
            //   0f8f6cffffff         | arpl                ax, cx
            //   7c08                 | mov                 edx, 1

        $sequence_14 = { 0130 8b7510 83794c00 8bd3 7451 e8???????? 8bd3 }
            // n = 7, score = 100
            //   0130                 | cmp                 word ptr [ecx], 0
            //   8b7510               | jne                 0
            //   83794c00             | dec                 eax
            //   8bd3                 | add                 ecx, 2
            //   7451                 | inc                 edx
            //   e8????????           |                     
            //   8bd3                 | je                  0xb

    condition:
        7 of them and filesize < 591872
}