rule win_zhcat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { e8???????? 8b45f8 8945b4 8b45f4 83c40c }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8945b4               | mov                 dword ptr [ebp - 0x4c], eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 7353 8bc1 c1f805 8bf1 83e61f 8d3c8540604100 }
            // n = 6, score = 200
            //   7353                 | jae                 0x55
            //   8bc1                 | mov                 eax, ecx
            //   c1f805               | sar                 eax, 5
            //   8bf1                 | mov                 esi, ecx
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8540604100       | lea                 edi, [eax*4 + 0x416040]

        $sequence_2 = { 8b4dfc 83c40c 894104 3975e4 }
            // n = 4, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c40c               | add                 esp, 0xc
            //   894104               | mov                 dword ptr [ecx + 4], eax
            //   3975e4               | cmp                 dword ptr [ebp - 0x1c], esi

        $sequence_3 = { 8d45c8 50 8d45e8 50 68???????? 57 }
            // n = 6, score = 200
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   50                   | push                eax
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   68????????           |                     
            //   57                   | push                edi

        $sequence_4 = { 56 8d34c590444100 833e00 7513 50 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   8d34c590444100       | lea                 esi, [eax*8 + 0x414490]
            //   833e00               | cmp                 dword ptr [esi], 0
            //   7513                 | jne                 0x15
            //   50                   | push                eax

        $sequence_5 = { 5f ff750c 8bc7 33db 668945e0 ffd6 668945e2 }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8bc7                 | mov                 eax, edi
            //   33db                 | xor                 ebx, ebx
            //   668945e0             | mov                 word ptr [ebp - 0x20], ax
            //   ffd6                 | call                esi
            //   668945e2             | mov                 word ptr [ebp - 0x1e], ax

        $sequence_6 = { 1bf6 8d7df8 895df4 83e6c2 }
            // n = 4, score = 200
            //   1bf6                 | sbb                 esi, esi
            //   8d7df8               | lea                 edi, [ebp - 8]
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   83e6c2               | and                 esi, 0xffffffc2

        $sequence_7 = { 59 eb61 8b06 8b4dfc 897d0c 8bf8 }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   eb61                 | jmp                 0x63
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   897d0c               | mov                 dword ptr [ebp + 0xc], edi
            //   8bf8                 | mov                 edi, eax

        $sequence_8 = { 8bf0 897510 83feff 0f849e000000 }
            // n = 4, score = 200
            //   8bf0                 | mov                 esi, eax
            //   897510               | mov                 dword ptr [ebp + 0x10], esi
            //   83feff               | cmp                 esi, -1
            //   0f849e000000         | je                  0xa4

        $sequence_9 = { 59 59 83fe01 7409 895cb5f4 e9???????? }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   83fe01               | cmp                 esi, 1
            //   7409                 | je                  0xb
            //   895cb5f4             | mov                 dword ptr [ebp + esi*4 - 0xc], ebx
            //   e9????????           |                     

    condition:
        7 of them and filesize < 376832
}