rule win_joanap_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.joanap"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { 7513 6a1e ff15???????? 85ff 75a9 5f 5e }
            // n = 7, score = 100
            //   7513                 | jne                 0x15
            //   6a1e                 | push                0x1e
            //   ff15????????         |                     
            //   85ff                 | test                edi, edi
            //   75a9                 | jne                 0xffffffab
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_1 = { 8bd1 c1fa08 8a8000b92c00 32c2 8b54242c 8806 46 }
            // n = 7, score = 100
            //   8bd1                 | mov                 edx, ecx
            //   c1fa08               | sar                 edx, 8
            //   8a8000b92c00         | mov                 al, byte ptr [eax + 0x2cb900]
            //   32c2                 | xor                 al, dl
            //   8b54242c             | mov                 edx, dword ptr [esp + 0x2c]
            //   8806                 | mov                 byte ptr [esi], al
            //   46                   | inc                 esi

        $sequence_2 = { 51 56 c7803c05000001000000 e8???????? 83c414 83f8ff 7440 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   56                   | push                esi
            //   c7803c05000001000000     | mov    dword ptr [eax + 0x53c], 1
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   83f8ff               | cmp                 eax, -1
            //   7440                 | je                  0x42

        $sequence_3 = { 6a01 6860ea0000 8d442420 6a10 }
            // n = 4, score = 100
            //   6a01                 | push                1
            //   6860ea0000           | push                0xea60
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   6a10                 | push                0x10

        $sequence_4 = { 740b 85db 7407 56 ff15???????? 5f 5e }
            // n = 7, score = 100
            //   740b                 | je                  0xd
            //   85db                 | test                ebx, ebx
            //   7407                 | je                  9
            //   56                   | push                esi
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_5 = { 89742414 8b149500c32c00 8b742438 8b1c8d00bf2c00 33c9 8a4c241b 33d3 }
            // n = 7, score = 100
            //   89742414             | mov                 dword ptr [esp + 0x14], esi
            //   8b149500c32c00       | mov                 edx, dword ptr [edx*4 + 0x2cc300]
            //   8b742438             | mov                 esi, dword ptr [esp + 0x38]
            //   8b1c8d00bf2c00       | mov                 ebx, dword ptr [ecx*4 + 0x2cbf00]
            //   33c9                 | xor                 ecx, ecx
            //   8a4c241b             | mov                 cl, byte ptr [esp + 0x1b]
            //   33d3                 | xor                 edx, ebx

        $sequence_6 = { 0f852b010000 6a00 55 6a64 68???????? e8???????? }
            // n = 6, score = 100
            //   0f852b010000         | jne                 0x131
            //   6a00                 | push                0
            //   55                   | push                ebp
            //   6a64                 | push                0x64
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_7 = { e8???????? 83c410 83f8ff 745e 85c0 7410 8d54241c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   83f8ff               | cmp                 eax, -1
            //   745e                 | je                  0x60
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   8d54241c             | lea                 edx, [esp + 0x1c]

        $sequence_8 = { 51 56 ffd7 85c0 a3???????? 7533 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   7533                 | jne                 0x35

        $sequence_9 = { 6a1e 50 e8???????? 8b15???????? 8d0c40 dd03 }
            // n = 6, score = 100
            //   6a1e                 | push                0x1e
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b15????????         |                     
            //   8d0c40               | lea                 ecx, [eax + eax*2]
            //   dd03                 | fld                 qword ptr [ebx]

    condition:
        7 of them and filesize < 270336
}