rule win_vawtrak_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vawtrak"
        malpedia_version = "20190204"
        malpedia_license = "CC BY-NC-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 / approach will be published in the near future 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 = { 6a04 6a01 50 ff15???????? 85c0 }
            // n = 5, score = 1400
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_1 = { ff35???????? 6a04 6a01 50 }
            // n = 4, score = 1400
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax

        $sequence_2 = { ff35???????? 6a04 6a01 50 ff15???????? }
            // n = 5, score = 1400
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 6a01 ff35???????? 6a04 6a01 50 ff15???????? 85c0 }
            // n = 7, score = 1400
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_4 = { 6a01 ff35???????? 6a04 6a01 50 }
            // n = 5, score = 1400
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax

        $sequence_5 = { 6a01 ff35???????? 6a04 6a01 }
            // n = 4, score = 1400
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1

        $sequence_6 = { 50 6a00 6a00 e8???????? 50 ff15???????? }
            // n = 6, score = 1400
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_7 = { 6a01 ff35???????? 6a04 6a01 50 ff15???????? }
            // n = 6, score = 1400
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_8 = { ff35???????? 6a04 6a01 50 ff15???????? 85c0 }
            // n = 6, score = 1400
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_9 = { 8706 83f801 74f6 e8???????? }
            // n = 4, score = 1300
            //   8706                 | xchg                dword ptr [esi], eax
            //   83f801               | cmp                 eax, 1
            //   74f6                 | je                  0xfffffff8
            //   e8????????           |                     

    condition:
        7 of them
}