rule win_badcall_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.badcall."
        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.badcall"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { c20800 53 8b5c2410 57 53 }
            // n = 5, score = 300
            //   c20800               | ret                 8
            //   53                   | push                ebx
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]
            //   57                   | push                edi
            //   53                   | push                ebx

        $sequence_1 = { 83c40c 85c0 7e06 03f0 3bf7 7ce1 }
            // n = 6, score = 300
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7e06                 | jle                 8
            //   03f0                 | add                 esi, eax
            //   3bf7                 | cmp                 esi, edi
            //   7ce1                 | jl                  0xffffffe3

        $sequence_2 = { 51 8bce e8???????? 85c0 7407 5f }
            // n = 6, score = 300
            //   51                   | push                ecx
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   5f                   | pop                 edi

        $sequence_3 = { 68???????? a3???????? a3???????? a3???????? a1???????? 50 c705????????04000000 }
            // n = 7, score = 300
            //   68????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   50                   | push                eax
            //   c705????????04000000     |     

        $sequence_4 = { 52 c744241800000000 ffd3 5e 5d }
            // n = 5, score = 300
            //   52                   | push                edx
            //   c744241800000000     | mov                 dword ptr [esp + 0x18], 0
            //   ffd3                 | call                ebx
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_5 = { 8b442404 48 7455 48 }
            // n = 4, score = 300
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   48                   | dec                 eax
            //   7455                 | je                  0x57
            //   48                   | dec                 eax

        $sequence_6 = { 68ffff0000 50 66c74424180100 66c744241a0000 ff15???????? }
            // n = 5, score = 300
            //   68ffff0000           | push                0xffff
            //   50                   | push                eax
            //   66c74424180100       | mov                 word ptr [esp + 0x18], 1
            //   66c744241a0000       | mov                 word ptr [esp + 0x1a], 0
            //   ff15????????         |                     

        $sequence_7 = { ff15???????? c20400 c705????????01000000 a1???????? 68???????? }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   c705????????01000000     |     
            //   a1????????           |                     
            //   68????????           |                     

        $sequence_8 = { 89542412 6689542416 ff15???????? 8b4e04 6689442406 8d442404 }
            // n = 6, score = 300
            //   89542412             | mov                 dword ptr [esp + 0x12], edx
            //   6689542416           | mov                 word ptr [esp + 0x16], dx
            //   ff15????????         |                     
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   6689442406           | mov                 word ptr [esp + 6], ax
            //   8d442404             | lea                 eax, [esp + 4]

        $sequence_9 = { 50 c705????????04000000 ff15???????? c20400 a1???????? 68???????? }
            // n = 6, score = 300
            //   50                   | push                eax
            //   c705????????04000000     |     
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   a1????????           |                     
            //   68????????           |                     

        $sequence_10 = { 83e803 7557 33c0 68???????? a3???????? a3???????? }
            // n = 6, score = 300
            //   83e803               | sub                 eax, 3
            //   7557                 | jne                 0x59
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     

        $sequence_11 = { 7455 48 7434 83e803 }
            // n = 4, score = 300
            //   7455                 | je                  0x57
            //   48                   | dec                 eax
            //   7434                 | je                  0x36
            //   83e803               | sub                 eax, 3

        $sequence_12 = { e8???????? 8b4604 8bcf 50 e8???????? 5f b801000000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8bcf                 | mov                 ecx, edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   b801000000           | mov                 eax, 1

        $sequence_13 = { 8d7c2411 895c2408 f3ab 66ab aa }
            // n = 5, score = 300
            //   8d7c2411             | lea                 edi, [esp + 0x11]
            //   895c2408             | mov                 dword ptr [esp + 8], ebx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_14 = { 2bfd 83c408 d1ff 66c7847c3e0100000000 }
            // n = 4, score = 200
            //   2bfd                 | sub                 edi, ebp
            //   83c408               | add                 esp, 8
            //   d1ff                 | sar                 edi, 1
            //   66c7847c3e0100000000     | mov    word ptr [esp + edi*2 + 0x13e], 0

        $sequence_15 = { 83c408 53 e8???????? 83c404 85c0 7426 53 }
            // n = 7, score = 200
            //   83c408               | add                 esp, 8
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   7426                 | je                  0x28
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 483328
}