rule win_badcall_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 52 50 ff15???????? 8b4c2410 51 ffd6 8b54240c }
            // n = 7, score = 300
            //   52                   | push                edx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]

        $sequence_1 = { 894608 85c0 7509 b801000000 5e c20400 8b4c2408 }
            // n = 7, score = 300
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   85c0                 | test                eax, eax
            //   7509                 | jne                 0xb
            //   b801000000           | mov                 eax, 1
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]

        $sequence_2 = { 8d7e2c 8bcf e8???????? 8b4604 }
            // n = 4, score = 300
            //   8d7e2c               | lea                 edi, [esi + 0x2c]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]

        $sequence_3 = { 50 51 ff15???????? 5e 83c410 c20800 83c8ff }
            // n = 7, score = 300
            //   50                   | push                eax
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   83c410               | add                 esp, 0x10
            //   c20800               | ret                 8
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_4 = { 8b442404 48 7455 48 7434 83e803 7557 }
            // n = 7, score = 300
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   48                   | dec                 eax
            //   7455                 | je                  0x57
            //   48                   | dec                 eax
            //   7434                 | je                  0x36
            //   83e803               | sub                 eax, 3
            //   7557                 | jne                 0x59

        $sequence_5 = { 50 c705????????04000000 ff15???????? c20400 a1???????? 68???????? 50 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   c705????????04000000     |     
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   a1????????           |                     
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_6 = { 6a00 50 68???????? 6a00 6a00 ffd6 6aff }
            // n = 7, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   68????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   6aff                 | push                -1

        $sequence_7 = { ff15???????? c20400 c705????????01000000 a1???????? 68???????? 50 }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   c705????????01000000     |     
            //   a1????????           |                     
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_8 = { 5d b801000000 5b 81c414020000 c20c00 8bce e8???????? }
            // n = 7, score = 300
            //   5d                   | pop                 ebp
            //   b801000000           | mov                 eax, 1
            //   5b                   | pop                 ebx
            //   81c414020000         | add                 esp, 0x214
            //   c20c00               | ret                 0xc
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_9 = { 7557 33c0 68???????? a3???????? a3???????? a3???????? }
            // n = 6, score = 300
            //   7557                 | jne                 0x59
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     

        $sequence_10 = { 8b542408 83c108 8901 8b44240c 895104 8b542410 }
            // n = 6, score = 300
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   83c108               | add                 ecx, 8
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]

        $sequence_11 = { a3???????? a3???????? a3???????? a1???????? 50 c705????????04000000 ff15???????? }
            // n = 7, score = 300
            //   a3????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   50                   | push                eax
            //   c705????????04000000     |     
            //   ff15????????         |                     

        $sequence_12 = { 8d4c243c e8???????? 56 ff15???????? b907000000 33c0 }
            // n = 6, score = 300
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]
            //   e8????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   b907000000           | mov                 ecx, 7
            //   33c0                 | xor                 eax, eax

        $sequence_13 = { 83f801 0f85f7000000 8b4e3c 8b4658 8b16 03cf }
            // n = 6, score = 200
            //   83f801               | cmp                 eax, 1
            //   0f85f7000000         | jne                 0xfd
            //   8b4e3c               | mov                 ecx, dword ptr [esi + 0x3c]
            //   8b4658               | mov                 eax, dword ptr [esi + 0x58]
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   03cf                 | add                 ecx, edi

        $sequence_14 = { 8b0e 8bd7 2bd1 6afc 03c2 }
            // n = 5, score = 200
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   8bd7                 | mov                 edx, edi
            //   2bd1                 | sub                 edx, ecx
            //   6afc                 | push                -4
            //   03c2                 | add                 eax, edx

        $sequence_15 = { 89542418 894b04 0f8594040000 8b4318 f7d8 1bc0 }
            // n = 6, score = 200
            //   89542418             | mov                 dword ptr [esp + 0x18], edx
            //   894b04               | mov                 dword ptr [ebx + 4], ecx
            //   0f8594040000         | jne                 0x49a
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax

    condition:
        7 of them and filesize < 483328
}