rule win_crypmic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.crypmic."
        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.crypmic"
        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 = { 395818 764a 8b7820 03f9 }
            // n = 4, score = 300
            //   395818               | cmp                 dword ptr [eax + 0x18], ebx
            //   764a                 | jbe                 0x4c
            //   8b7820               | mov                 edi, dword ptr [eax + 0x20]
            //   03f9                 | add                 edi, ecx

        $sequence_1 = { 83ec08 53 56 33f6 57 8955fc 8bd9 }
            // n = 7, score = 300
            //   83ec08               | sub                 esp, 8
            //   53                   | push                ebx
            //   56                   | push                esi
            //   33f6                 | xor                 esi, esi
            //   57                   | push                edi
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   8bd9                 | mov                 ebx, ecx

        $sequence_2 = { 5e b805400080 5b 8be5 5d c3 8d45d4 }
            // n = 7, score = 300
            //   5e                   | pop                 esi
            //   b805400080           | mov                 eax, 0x80004005
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8d45d4               | lea                 eax, [ebp - 0x2c]

        $sequence_3 = { 8bcf 66894302 e8???????? ff75f8 8b470c 6a00 }
            // n = 6, score = 300
            //   8bcf                 | mov                 ecx, edi
            //   66894302             | mov                 word ptr [ebx + 2], ax
            //   e8????????           |                     
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   8b470c               | mov                 eax, dword ptr [edi + 0xc]
            //   6a00                 | push                0

        $sequence_4 = { 0fb70c08 8b421c 8d0488 8b4df8 8b0408 }
            // n = 5, score = 300
            //   0fb70c08             | movzx               ecx, word ptr [eax + ecx]
            //   8b421c               | mov                 eax, dword ptr [edx + 0x1c]
            //   8d0488               | lea                 eax, [eax + ecx*4]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8b0408               | mov                 eax, dword ptr [eax + ecx]

        $sequence_5 = { ba5c000000 66891448 8d1c48 8d8d94fdffff }
            // n = 4, score = 300
            //   ba5c000000           | mov                 edx, 0x5c
            //   66891448             | mov                 word ptr [eax + ecx*2], dx
            //   8d1c48               | lea                 ebx, [eax + ecx*2]
            //   8d8d94fdffff         | lea                 ecx, [ebp - 0x26c]

        $sequence_6 = { 8b4de4 894f04 8b4de8 894f08 668b4df0 66894f0c }
            // n = 6, score = 300
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   894f04               | mov                 dword ptr [edi + 4], ecx
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   894f08               | mov                 dword ptr [edi + 8], ecx
            //   668b4df0             | mov                 cx, word ptr [ebp - 0x10]
            //   66894f0c             | mov                 word ptr [edi + 0xc], cx

        $sequence_7 = { 3b75fc 770b 8b55f8 8b4df4 }
            // n = 4, score = 300
            //   3b75fc               | cmp                 esi, dword ptr [ebp - 4]
            //   770b                 | ja                  0xd
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_8 = { ffd0 0fb717 33f6 33c9 8945f8 }
            // n = 5, score = 300
            //   ffd0                 | call                eax
            //   0fb717               | movzx               edx, word ptr [edi]
            //   33f6                 | xor                 esi, esi
            //   33c9                 | xor                 ecx, ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_9 = { 56 57 894df4 83f828 }
            // n = 4, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   83f828               | cmp                 eax, 0x28

    condition:
        7 of them and filesize < 81920
}