rule win_tinymet_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.tinymet."
        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.tinymet"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 68???????? e9???????? ff15???????? 85c0 7407 }
            // n = 5, score = 100
            //   68????????           |                     
            //   e9????????           |                     
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9

        $sequence_1 = { 53 56 53 53 53 8d4de8 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d4de8               | lea                 ecx, [ebp - 0x18]

        $sequence_2 = { 0fbe00 83e830 743c 48 7435 48 741d }
            // n = 7, score = 100
            //   0fbe00               | movsx               eax, byte ptr [eax]
            //   83e830               | sub                 eax, 0x30
            //   743c                 | je                  0x3e
            //   48                   | dec                 eax
            //   7435                 | je                  0x37
            //   48                   | dec                 eax
            //   741d                 | je                  0x1f

        $sequence_3 = { ff750c 8b00 8b00 a3???????? e8???????? 59 50 }
            // n = 7, score = 100
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   a3????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax

        $sequence_4 = { a1???????? 56 57 6a5c ff30 e8???????? 8bf0 }
            // n = 7, score = 100
            //   a1????????           |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a5c                 | push                0x5c
            //   ff30                 | push                dword ptr [eax]
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_5 = { 56 ff15???????? 85c0 740a 68???????? e9???????? }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   68????????           |                     
            //   e9????????           |                     

        $sequence_6 = { a3???????? 6a04 c600bf 8d45fc }
            // n = 4, score = 100
            //   a3????????           |                     
            //   6a04                 | push                4
            //   c600bf               | mov                 byte ptr [eax], 0xbf
            //   8d45fc               | lea                 eax, [ebp - 4]

        $sequence_7 = { ff15???????? a3???????? 85c0 750a 68???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   68????????           |                     

    condition:
        7 of them and filesize < 57344
}