rule win_zhcat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.zhcat."
        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.zhcat"
        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 = { 8bf9 eb02 33ff 8b45f0 8b1d???????? }
            // n = 5, score = 200
            //   8bf9                 | mov                 edi, ecx
            //   eb02                 | jmp                 4
            //   33ff                 | xor                 edi, edi
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b1d????????         |                     

        $sequence_1 = { 03f3 56 57 ff7508 ff15???????? 57 8bf0 }
            // n = 7, score = 200
            //   03f3                 | add                 esi, ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   57                   | push                edi
            //   8bf0                 | mov                 esi, eax

        $sequence_2 = { c705????????02000000 eb1c c605????????01 eb13 c705????????01000000 eb07 c605????????01 }
            // n = 7, score = 200
            //   c705????????02000000     |     
            //   eb1c                 | jmp                 0x1e
            //   c605????????01       |                     
            //   eb13                 | jmp                 0x15
            //   c705????????01000000     |     
            //   eb07                 | jmp                 9
            //   c605????????01       |                     

        $sequence_3 = { 894df8 8975f4 e8???????? 59 }
            // n = 4, score = 200
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8975f4               | mov                 dword ptr [ebp - 0xc], esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_4 = { 6a00 ff75f0 ff15???????? 8945f8 ebde 33f6 68???????? }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   ff15????????         |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   ebde                 | jmp                 0xffffffe0
            //   33f6                 | xor                 esi, esi
            //   68????????           |                     

        $sequence_5 = { 56 ff750c 68???????? 57 e8???????? 33f6 83c40c }
            // n = 7, score = 200
            //   56                   | push                esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   68????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi
            //   83c40c               | add                 esp, 0xc

        $sequence_6 = { 8906 8d45fc 50 53 56 68???????? 53 }
            // n = 7, score = 200
            //   8906                 | mov                 dword ptr [esi], eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   68????????           |                     
            //   53                   | push                ebx

        $sequence_7 = { ebe6 c745e0b0f14000 817de0b4f14000 7311 8b45e0 8b00 85c0 }
            // n = 7, score = 200
            //   ebe6                 | jmp                 0xffffffe8
            //   c745e0b0f14000       | mov                 dword ptr [ebp - 0x20], 0x40f1b0
            //   817de0b4f14000       | cmp                 dword ptr [ebp - 0x20], 0x40f1b4
            //   7311                 | jae                 0x13
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   85c0                 | test                eax, eax

        $sequence_8 = { 8d45f8 8d5dfc e8???????? 59 }
            // n = 4, score = 200
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   8d5dfc               | lea                 ebx, [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_9 = { 807e0a00 7534 803d????????00 742b 33c9 394d08 7e24 }
            // n = 7, score = 200
            //   807e0a00             | cmp                 byte ptr [esi + 0xa], 0
            //   7534                 | jne                 0x36
            //   803d????????00       |                     
            //   742b                 | je                  0x2d
            //   33c9                 | xor                 ecx, ecx
            //   394d08               | cmp                 dword ptr [ebp + 8], ecx
            //   7e24                 | jle                 0x26

    condition:
        7 of them and filesize < 376832
}