rule win_joanap_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.joanap."
        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.joanap"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 89442430 8b44242c 894c2438 85c0 }
            // n = 4, score = 100
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   894c2438             | mov                 dword ptr [esp + 0x38], ecx
            //   85c0                 | test                eax, eax

        $sequence_1 = { e8???????? 83c404 eb0a 51 56 e8???????? 83c408 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   eb0a                 | jmp                 0xc
            //   51                   | push                ecx
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_2 = { 8b500c 8d44242c 50 8954244c e8???????? 8b08 6a00 }
            // n = 7, score = 100
            //   8b500c               | mov                 edx, dword ptr [eax + 0xc]
            //   8d44242c             | lea                 eax, dword ptr [esp + 0x2c]
            //   50                   | push                eax
            //   8954244c             | mov                 dword ptr [esp + 0x4c], edx
            //   e8????????           |                     
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   6a00                 | push                0

        $sequence_3 = { 83f8ff 740b 6681ffffff 0f8272ffffff 53 ff15???????? 33d2 }
            // n = 7, score = 100
            //   83f8ff               | cmp                 eax, -1
            //   740b                 | je                  0xd
            //   6681ffffff           | cmp                 di, 0xffff
            //   0f8272ffffff         | jb                  0xffffff78
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   33d2                 | xor                 edx, edx

        $sequence_4 = { dd5cd010 eb49 8b0d???????? 6a1e 51 e8???????? 8b15???????? }
            // n = 7, score = 100
            //   dd5cd010             | fstp                qword ptr [eax + edx*8 + 0x10]
            //   eb49                 | jmp                 0x4b
            //   8b0d????????         |                     
            //   6a1e                 | push                0x1e
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_5 = { 40 3aca 74f3 8a08 880e 8a4801 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   3aca                 | cmp                 cl, dl
            //   74f3                 | je                  0xfffffff5
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   880e                 | mov                 byte ptr [esi], cl
            //   8a4801               | mov                 cl, byte ptr [eax + 1]

        $sequence_6 = { 81e2ff000000 8a9200b92c00 32d3 885003 8b7e04 33d2 }
            // n = 6, score = 100
            //   81e2ff000000         | and                 edx, 0xff
            //   8a9200b92c00         | mov                 dl, byte ptr [edx + 0x2cb900]
            //   32d3                 | xor                 dl, bl
            //   885003               | mov                 byte ptr [eax + 3], dl
            //   8b7e04               | mov                 edi, dword ptr [esi + 4]
            //   33d2                 | xor                 edx, edx

        $sequence_7 = { e8???????? 56 e8???????? 83c418 55 e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   55                   | push                ebp
            //   e8????????           |                     

        $sequence_8 = { 56 55 ff15???????? 85c0 0f8440030000 397c2414 0f8536030000 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   55                   | push                ebp
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8440030000         | je                  0x346
            //   397c2414             | cmp                 dword ptr [esp + 0x14], edi
            //   0f8536030000         | jne                 0x33c

        $sequence_9 = { c3 8b442418 57 53 83c604 50 }
            // n = 6, score = 100
            //   c3                   | ret                 
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   57                   | push                edi
            //   53                   | push                ebx
            //   83c604               | add                 esi, 4
            //   50                   | push                eax

    condition:
        7 of them and filesize < 270336
}