rule win_atmii_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.atmii."
        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.atmii"
        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 = { 8d8ddcfbffff 68???????? 51 ffd7 }
            // n = 4, score = 100
            //   8d8ddcfbffff         | lea                 ecx, [ebp - 0x424]
            //   68????????           |                     
            //   51                   | push                ecx
            //   ffd7                 | call                edi

        $sequence_1 = { 8d8ddcfbffff 51 e8???????? 8b55fc 83c414 6aff 52 }
            // n = 7, score = 100
            //   8d8ddcfbffff         | lea                 ecx, [ebp - 0x424]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   83c414               | add                 esp, 0x14
            //   6aff                 | push                -1
            //   52                   | push                edx

        $sequence_2 = { 8b4e08 030e 6a05 8d45ec 50 }
            // n = 5, score = 100
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   030e                 | add                 ecx, dword ptr [esi]
            //   6a05                 | push                5
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax

        $sequence_3 = { ff15???????? 8b35???????? 68???????? 68f6010000 8d8dfcfcffff }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   68????????           |                     
            // 
            //   8d8dfcfcffff         | lea                 ecx, [ebp - 0x304]

        $sequence_4 = { 8b35???????? 68???????? 68ae020000 8d8500feffff 68???????? }
            // n = 5, score = 100
            //   8b35????????         |                     
            //   68????????           |                     
            //   68ae020000           | push                0x2ae
            //   8d8500feffff         | lea                 eax, [ebp - 0x200]
            //   68????????           |                     

        $sequence_5 = { 8945fc 837dfc00 7454 8b4dfc 0fb611 85d2 7524 }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0
            //   7454                 | je                  0x56
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   0fb611               | movzx               edx, byte ptr [ecx]
            //   85d2                 | test                edx, edx
            //   7524                 | jne                 0x26

        $sequence_6 = { 837d0803 0f8ceb000000 53 8b1d???????? 57 68???????? }
            // n = 6, score = 100
            //   837d0803             | cmp                 dword ptr [ebp + 8], 3
            //   0f8ceb000000         | jl                  0xf1
            //   53                   | push                ebx
            //   8b1d????????         |                     
            //   57                   | push                edi
            //   68????????           |                     

        $sequence_7 = { ffd2 8945f8 837df800 750a 8b45fc 8b4809 }
            // n = 6, score = 100
            //   ffd2                 | call                edx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   837df800             | cmp                 dword ptr [ebp - 8], 0
            //   750a                 | jne                 0xc
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b4809               | mov                 ecx, dword ptr [eax + 9]

        $sequence_8 = { 81ec3c060000 56 50 6a00 }
            // n = 4, score = 100
            //   81ec3c060000         | sub                 esp, 0x63c
            //   56                   | push                esi
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_9 = { 668b0a 8a5dfe 66894814 8a4dff 03d6 eb25 83481820 }
            // n = 7, score = 100
            //   668b0a               | mov                 cx, word ptr [edx]
            //   8a5dfe               | mov                 bl, byte ptr [ebp - 2]
            //   66894814             | mov                 word ptr [eax + 0x14], cx
            //   8a4dff               | mov                 cl, byte ptr [ebp - 1]
            //   03d6                 | add                 edx, esi
            //   eb25                 | jmp                 0x27
            //   83481820             | or                  dword ptr [eax + 0x18], 0x20

        $sequence_10 = { 8b4df4 8b3488 8b4604 6a40 85c0 }
            // n = 5, score = 100
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8b3488               | mov                 esi, dword ptr [eax + ecx*4]
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   6a40                 | push                0x40
            //   85c0                 | test                eax, eax

        $sequence_11 = { 8b35???????? ffd6 0fb74304 83f803 7738 ff2485181d0010 }
            // n = 6, score = 100
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   0fb74304             | movzx               eax, word ptr [ebx + 4]
            //   83f803               | cmp                 eax, 3
            //   7738                 | ja                  0x3a
            //   ff2485181d0010       | jmp                 dword ptr [eax*4 + 0x10001d18]

        $sequence_12 = { 50 ff15???????? 84db 751c 8b7d08 e8???????? 5f }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   84db                 | test                bl, bl
            //   751c                 | jne                 0x1e
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   5f                   | pop                 edi

        $sequence_13 = { 8945fc 85c0 0f8495010000 68???????? 689a000000 }
            // n = 5, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   85c0                 | test                eax, eax
            //   0f8495010000         | je                  0x19b
            //   68????????           |                     
            //   689a000000           | push                0x9a

        $sequence_14 = { e8???????? 8b15???????? 83c404 5f }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8b15????????         |                     
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi

        $sequence_15 = { 68???????? 52 ffd7 85c0 751b 8b45fc 50 }
            // n = 7, score = 100
            //   68????????           |                     
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   751b                 | jne                 0x1d
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 49152
}