rule win_joanap_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 7cda 8bc7 5f ddd8 5e c3 5f }
            // n = 7, score = 100
            //   7cda                 | jl                  0xffffffdc
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   ddd8                 | fstp                st(0)
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   5f                   | pop                 edi

        $sequence_1 = { f2ae f7d1 49 03eb 8d7c2906 83c9ff f2ae }
            // n = 7, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   03eb                 | add                 ebp, ebx
            //   8d7c2906             | lea                 edi, [ecx + ebp + 6]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]

        $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 = { c3 8b5c2414 50 ff15???????? 5f 5e 8bc3 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8b5c2414             | mov                 ebx, dword ptr [esp + 0x14]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8bc3                 | mov                 eax, ebx

        $sequence_4 = { 8b44241c 50 ff15???????? 8b442420 5b 85c0 750e }
            // n = 7, score = 100
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   5b                   | pop                 ebx
            //   85c0                 | test                eax, eax
            //   750e                 | jne                 0x10

        $sequence_5 = { ff15???????? 8b4c2410 6a01 6860ea0000 8d9424a0000000 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   6a01                 | push                1
            //   6860ea0000           | push                0xea60
            //   8d9424a0000000       | lea                 edx, [esp + 0xa0]

        $sequence_6 = { 6683780400 7422 8b0d???????? 8b10 8911 8b5004 895104 }
            // n = 7, score = 100
            //   6683780400           | cmp                 word ptr [eax + 4], 0
            //   7422                 | je                  0x24
            //   8b0d????????         |                     
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8911                 | mov                 dword ptr [ecx], edx
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   895104               | mov                 dword ptr [ecx + 4], edx

        $sequence_7 = { 52 56 ffd7 85c0 a3???????? 7533 8d8c2408010000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   7533                 | jne                 0x35
            //   8d8c2408010000       | lea                 ecx, [esp + 0x108]

        $sequence_8 = { e8???????? 6a04 6a00 68???????? 8d542440 68???????? 52 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   6a04                 | push                4
            //   6a00                 | push                0
            //   68????????           |                     
            //   8d542440             | lea                 edx, [esp + 0x40]
            //   68????????           |                     
            //   52                   | push                edx

        $sequence_9 = { 55 8bec 83ec4c 56 8d45f0 57 50 }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec4c               | sub                 esp, 0x4c
            //   56                   | push                esi
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   57                   | push                edi
            //   50                   | push                eax

    condition:
        7 of them and filesize < 270336
}