rule win_crypmic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 6810040000 6a08 ff7104 8bfa }
            // n = 4, score = 300
            //   6810040000           | push                0x410
            //   6a08                 | push                8
            //   ff7104               | push                dword ptr [ecx + 4]
            //   8bfa                 | mov                 edi, edx

        $sequence_1 = { ff7104 8bfa 894dec c745e800000000 ffd0 0fb717 }
            // n = 6, score = 300
            //   ff7104               | push                dword ptr [ecx + 4]
            //   8bfa                 | mov                 edi, edx
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   ffd0                 | call                eax
            //   0fb717               | movzx               edx, word ptr [edi]

        $sequence_2 = { 8bec 83ec0c 8b413c 53 8b440878 }
            // n = 5, score = 300
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc
            //   8b413c               | mov                 eax, dword ptr [ecx + 0x3c]
            //   53                   | push                ebx
            //   8b440878             | mov                 eax, dword ptr [eax + ecx + 0x78]

        $sequence_3 = { 8b413c 33db 8b440878 03c1 8945fc 395818 }
            // n = 6, score = 300
            //   8b413c               | mov                 eax, dword ptr [ecx + 0x3c]
            //   33db                 | xor                 ebx, ebx
            //   8b440878             | mov                 eax, dword ptr [eax + ecx + 0x78]
            //   03c1                 | add                 eax, ecx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   395818               | cmp                 dword ptr [eax + 0x18], ebx

        $sequence_4 = { ffd0 85f6 7410 8b55f8 33c0 8bcf 66894302 }
            // n = 7, score = 300
            //   ffd0                 | call                eax
            //   85f6                 | test                esi, esi
            //   7410                 | je                  0x12
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   33c0                 | xor                 eax, eax
            //   8bcf                 | mov                 ecx, edi
            //   66894302             | mov                 word ptr [ebx + 2], ax

        $sequence_5 = { 8b470c 6a00 ff7704 ffd0 }
            // n = 4, score = 300
            //   8b470c               | mov                 eax, dword ptr [edi + 0xc]
            //   6a00                 | push                0
            //   ff7704               | push                dword ptr [edi + 4]
            //   ffd0                 | call                eax

        $sequence_6 = { d3e0 8d048528000000 50 8b4608 6a08 ff7604 ffd0 }
            // n = 7, score = 300
            //   d3e0                 | shl                 eax, cl
            //   8d048528000000       | lea                 eax, [eax*4 + 0x28]
            //   50                   | push                eax
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   6a08                 | push                8
            //   ff7604               | push                dword ptr [esi + 4]
            //   ffd0                 | call                eax

        $sequence_7 = { 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_8 = { 72f0 8b45f0 5f 5e 5b }
            // n = 5, score = 300
            //   72f0                 | jb                  0xfffffff2
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_9 = { ffd0 c70700000000 5f 5e }
            // n = 4, score = 300
            //   ffd0                 | call                eax
            //   c70700000000         | mov                 dword ptr [edi], 0
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

    condition:
        7 of them and filesize < 81920
}