rule win_fullmetal_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.fullmetal."
        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.fullmetal"
        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 = { 488bc8 33d2 e8???????? 488bd8 4885c0 7517 }
            // n = 6, score = 100
            //   488bc8               | dec                 eax
            //   33d2                 | test                eax, eax
            //   e8????????           |                     
            //   488bd8               | jne                 0x22
            //   4885c0               | inc                 ecx
            //   7517                 | mov                 eax, 0x1000

        $sequence_1 = { 4863c8 4881f9ff0f0000 7366 807c39ff5c 740a }
            // n = 5, score = 100
            //   4863c8               | dec                 eax
            //   4881f9ff0f0000       | arpl                ax, cx
            //   7366                 | dec                 eax
            //   807c39ff5c           | cmp                 ecx, 0xfff
            //   740a                 | jae                 0x68

        $sequence_2 = { 75f6 48c7c1ffffffff 48ffc1 803c0a00 75f7 48ffc0 }
            // n = 6, score = 100
            //   75f6                 | lea                 ecx, [0x29706]
            //   48c7c1ffffffff       | dec                 eax
            //   48ffc1               | lea                 edx, [0x29712]
            //   803c0a00             | dec                 eax
            //   75f7                 | mov                 ecx, ebx
            //   48ffc0               | jne                 0xfffffff8

        $sequence_3 = { 4b0394d8404a0400 8a02 88440dff 48ffc1 48ffc2 }
            // n = 5, score = 100
            //   4b0394d8404a0400     | inc                 ecx
            //   8a02                 | cmp                 byte ptr [edx + ecx], 0
            //   88440dff             | jne                 0
            //   48ffc1               | dec                 eax
            //   48ffc2               | inc                 eax

        $sequence_4 = { e8???????? 4885c0 7520 41b800100000 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   4885c0               | dec                 eax
            //   7520                 | mov                 ecx, 0xffffffff
            //   41b800100000         | dec                 eax

        $sequence_5 = { c3 a1????????3d0000a1 3c00 00053d0000f3 3c00 }
            // n = 5, score = 100
            //   c3                   | cmp                 byte ptr [ecx + edi - 1], 0x5c
            //   a1????????3d0000a1     |     
            //   3c00                 | je                  0x11
            //   00053d0000f3         | ret                 
            //   3c00                 | cmp                 al, 0

        $sequence_6 = { 7512 ff15???????? 4c8d0d06970200 e9???????? 488d1512970200 488bcb }
            // n = 6, score = 100
            //   7512                 | add                 byte ptr [0xf300003d], al
            //   ff15????????         |                     
            //   4c8d0d06970200       | cmp                 al, 0
            //   e9????????           |                     
            //   488d1512970200       | jne                 0x14
            //   488bcb               | dec                 esp

        $sequence_7 = { 4d63c8 488bd3 4c8d8340010000 4c895c2420 ff15???????? 0f1000 }
            // n = 6, score = 100
            //   4d63c8               | dec                 ebx
            //   488bd3               | add                 edx, dword ptr [eax + ebx*8 + 0x44a40]
            //   4c8d8340010000       | mov                 al, byte ptr [edx]
            //   4c895c2420           | mov                 byte ptr [ebp + ecx - 1], al
            //   ff15????????         |                     
            //   0f1000               | dec                 eax

    condition:
        7 of them and filesize < 733184
}