rule win_hyperssl_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.hyperssl"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 40 4f 75f2 5f 5e e9???????? }
            // n = 6, score = 200
            //   40                   | inc                 eax
            //   4f                   | dec                 edi
            //   75f2                 | jne                 0xfffffff4
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   e9????????           |                     

        $sequence_1 = { 5d c20c00 6a00 ff15???????? c3 }
            // n = 5, score = 200
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   c3                   | ret                 

        $sequence_2 = { 8b413c 03c1 742a 8b4028 03c1 }
            // n = 5, score = 200
            //   8b413c               | mov                 eax, dword ptr [ecx + 0x3c]
            //   03c1                 | add                 eax, ecx
            //   742a                 | je                  0x2c
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]
            //   03c1                 | add                 eax, ecx

        $sequence_3 = { 301401 8a10 301406 40 4f 75f2 }
            // n = 6, score = 200
            //   301401               | xor                 byte ptr [ecx + eax], dl
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   301406               | xor                 byte ptr [esi + eax], dl
            //   40                   | inc                 eax
            //   4f                   | dec                 edi
            //   75f2                 | jne                 0xfffffff4

        $sequence_4 = { 03c1 7423 56 57 b9???????? be???????? }
            // n = 6, score = 200
            //   03c1                 | add                 eax, ecx
            //   7423                 | je                  0x25
            //   56                   | push                esi
            //   57                   | push                edi
            //   b9????????           |                     
            //   be????????           |                     

        $sequence_5 = { 8bc8 85c9 7436 8b413c 03c1 742a 8b4028 }
            // n = 7, score = 200
            //   8bc8                 | mov                 ecx, eax
            //   85c9                 | test                ecx, ecx
            //   7436                 | je                  0x38
            //   8b413c               | mov                 eax, dword ptr [ecx + 0x3c]
            //   03c1                 | add                 eax, ecx
            //   742a                 | je                  0x2c
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]

        $sequence_6 = { 8b413c 03c1 742a 8b4028 03c1 7423 }
            // n = 6, score = 200
            //   8b413c               | mov                 eax, dword ptr [ecx + 0x3c]
            //   03c1                 | add                 eax, ecx
            //   742a                 | je                  0x2c
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]
            //   03c1                 | add                 eax, ecx
            //   7423                 | je                  0x25

        $sequence_7 = { 301406 40 4f 75f2 5f 5e e9???????? }
            // n = 7, score = 200
            //   301406               | xor                 byte ptr [esi + eax], dl
            //   40                   | inc                 eax
            //   4f                   | dec                 edi
            //   75f2                 | jne                 0xfffffff4
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   e9????????           |                     

        $sequence_8 = { 75f2 5f 5e e9???????? }
            // n = 4, score = 200
            //   75f2                 | jne                 0xfffffff4
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   e9????????           |                     

        $sequence_9 = { e8???????? 59 5d c20c00 6a00 ff15???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   6a00                 | push                0
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 167936
}