rule win_beepservice_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.beepservice."
        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.beepservice"
        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 = { 83c404 c3 6a00 6a00 6a00 }
            // n = 5, score = 1000
            //   83c404               | add                 esp, 4
            //   c3                   | ret                 
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_1 = { 6a00 6a00 6a00 56 6a00 6a00 57 }
            // n = 7, score = 1000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   57                   | push                edi

        $sequence_2 = { 85c0 7407 c745d801000000 c745fcffffffff }
            // n = 4, score = 1000
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   c745d801000000       | mov                 dword ptr [ebp - 0x28], 1
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff

        $sequence_3 = { 52 ffd7 83c408 85c0 75e2 8b442414 }
            // n = 6, score = 1000
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   75e2                 | jne                 0xffffffe4
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]

        $sequence_4 = { 75e2 8b442414 5f 5e 5b }
            // n = 5, score = 1000
            //   75e2                 | jne                 0xffffffe4
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_5 = { ff15???????? 668bf0 68???????? 81f699990000 }
            // n = 4, score = 1000
            //   ff15????????         |                     
            //   668bf0               | mov                 si, ax
            //   68????????           |                     
            //   81f699990000         | xor                 esi, 0x9999

        $sequence_6 = { 6a40 6800100000 8b5d10 53 56 57 ff15???????? }
            // n = 7, score = 1000
            //   6a40                 | push                0x40
            //   6800100000           | push                0x1000
            //   8b5d10               | mov                 ebx, dword ptr [ebp + 0x10]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_7 = { 85c0 750f 6800800000 6a00 56 57 ff15???????? }
            // n = 7, score = 1000
            //   85c0                 | test                eax, eax
            //   750f                 | jne                 0x11
            //   6800800000           | push                0x8000
            //   6a00                 | push                0
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_8 = { 7420 6a00 6a00 6a00 56 6a00 6a00 }
            // n = 7, score = 1000
            //   7420                 | je                  0x22
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_9 = { ff15???????? 85c0 7420 6a00 6a00 6a00 56 }
            // n = 7, score = 1000
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7420                 | je                  0x22
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi

    condition:
        7 of them and filesize < 253952
}