rule win_joanap_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 33d2 f3a7 5f 55 75a9 e8???????? 83c404 }
            // n = 7, score = 100
            //   33d2                 | xor                 edx, edx
            //   f3a7                 | repe cmpsd          dword ptr [esi], dword ptr es:[edi]
            //   5f                   | pop                 edi
            //   55                   | push                ebp
            //   75a9                 | jne                 0xffffffab
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_1 = { 6a00 6a00 68???????? 6a00 6a00 8935???????? ff15???????? }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8935????????         |                     
            //   ff15????????         |                     

        $sequence_2 = { 8d4c2424 6820bf0200 51 53 e8???????? }
            // n = 5, score = 100
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   6820bf0200           | push                0x2bf20
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_3 = { 6820bf0200 8d54245c 6a04 52 53 }
            // n = 5, score = 100
            //   6820bf0200           | push                0x2bf20
            //   8d54245c             | lea                 edx, [esp + 0x5c]
            //   6a04                 | push                4
            //   52                   | push                edx
            //   53                   | push                ebx

        $sequence_4 = { 33fb 33db 8adc 8b049500bb2c00 8b149d00c32c00 33c2 33d2 }
            // n = 7, score = 100
            //   33fb                 | xor                 edi, ebx
            //   33db                 | xor                 ebx, ebx
            //   8adc                 | mov                 bl, ah
            //   8b049500bb2c00       | mov                 eax, dword ptr [edx*4 + 0x2cbb00]
            //   8b149d00c32c00       | mov                 edx, dword ptr [ebx*4 + 0x2cc300]
            //   33c2                 | xor                 eax, edx
            //   33d2                 | xor                 edx, edx

        $sequence_5 = { 33c0 85d2 7e4b 53 55 8bac2414010000 47 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   85d2                 | test                edx, edx
            //   7e4b                 | jle                 0x4d
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   8bac2414010000       | mov                 ebp, dword ptr [esp + 0x114]
            //   47                   | inc                 edi

        $sequence_6 = { 8b4214 85c0 7434 6a01 8d442424 6820bf0200 50 }
            // n = 7, score = 100
            //   8b4214               | mov                 eax, dword ptr [edx + 0x14]
            //   85c0                 | test                eax, eax
            //   7434                 | je                  0x36
            //   6a01                 | push                1
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   6820bf0200           | push                0x2bf20
            //   50                   | push                eax

        $sequence_7 = { 56 ff15???????? eb17 8b542414 a1???????? 42 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   eb17                 | jmp                 0x19
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   a1????????           |                     
            //   42                   | inc                 edx

        $sequence_8 = { 33d2 8bdf 8a542417 897c2438 c1fb18 8a9200b92c00 }
            // n = 6, score = 100
            //   33d2                 | xor                 edx, edx
            //   8bdf                 | mov                 ebx, edi
            //   8a542417             | mov                 dl, byte ptr [esp + 0x17]
            //   897c2438             | mov                 dword ptr [esp + 0x38], edi
            //   c1fb18               | sar                 ebx, 0x18
            //   8a9200b92c00         | mov                 dl, byte ptr [edx + 0x2cb900]

        $sequence_9 = { 8d842494000000 6880000000 50 6800040000 68???????? 6a02 e8???????? }
            // n = 7, score = 100
            //   8d842494000000       | lea                 eax, [esp + 0x94]
            //   6880000000           | push                0x80
            //   50                   | push                eax
            //   6800040000           | push                0x400
            //   68????????           |                     
            //   6a02                 | push                2
            //   e8????????           |                     

    condition:
        7 of them and filesize < 270336
}