rule win_badcall_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badcall"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 7e3b 8b4604 8d542418 52 }
            // n = 4, score = 200
            //   7e3b                 | jle                 0x3d
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx

        $sequence_1 = { 68ffff0000 50 66c74424180100 66c744241a0000 ff15???????? 8b5604 }
            // n = 6, score = 200
            //   68ffff0000           | push                0xffff
            //   50                   | push                eax
            //   66c74424180100       | mov                 word ptr [esp + 0x18], 1
            //   66c744241a0000       | mov                 word ptr [esp + 0x1a], 0
            //   ff15????????         |                     
            //   8b5604               | mov                 edx, dword ptr [esi + 4]

        $sequence_2 = { ff15???????? c20400 c705????????01000000 a1???????? 68???????? }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   c705????????01000000     |     
            //   a1????????           |                     
            //   68????????           |                     

        $sequence_3 = { 7557 33c0 68???????? a3???????? a3???????? }
            // n = 5, score = 200
            //   7557                 | jne                 0x59
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   a3????????           |                     
            //   a3????????           |                     

        $sequence_4 = { 48 7455 48 7434 }
            // n = 4, score = 200
            //   48                   | dec                 eax
            //   7455                 | je                  0x57
            //   48                   | dec                 eax
            //   7434                 | je                  0x36

        $sequence_5 = { 8d4e2c c744241000000000 e8???????? 8d4e18 c7442410ffffffff e8???????? }
            // n = 6, score = 200
            //   8d4e2c               | lea                 ecx, [esi + 0x2c]
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   e8????????           |                     
            //   8d4e18               | lea                 ecx, [esi + 0x18]
            //   c7442410ffffffff     | mov                 dword ptr [esp + 0x10], 0xffffffff
            //   e8????????           |                     

        $sequence_6 = { 80c228 881408 40 3bc6 7cef }
            // n = 5, score = 200
            //   80c228               | add                 dl, 0x28
            //   881408               | mov                 byte ptr [eax + ecx], dl
            //   40                   | inc                 eax
            //   3bc6                 | cmp                 eax, esi
            //   7cef                 | jl                  0xfffffff1

        $sequence_7 = { 48 7434 83e803 7557 33c0 }
            // n = 5, score = 200
            //   48                   | dec                 eax
            //   7434                 | je                  0x36
            //   83e803               | sub                 eax, 3
            //   7557                 | jne                 0x59
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { e8???????? 50 ff15???????? 8bf0 83feff 7450 6a14 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83feff               | cmp                 esi, -1
            //   7450                 | je                  0x52
            //   6a14                 | push                0x14

        $sequence_9 = { ff15???????? c20400 a1???????? 68???????? 50 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   c20400               | ret                 4
            //   a1????????           |                     
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_10 = { a3???????? a3???????? a1???????? 50 c705????????04000000 ff15???????? }
            // n = 6, score = 200
            //   a3????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   50                   | push                eax
            //   c705????????04000000     |     
            //   ff15????????         |                     

        $sequence_11 = { e8???????? 83f801 750d 8d4c242c 51 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83f801               | cmp                 eax, 1
            //   750d                 | jne                 0xf
            //   8d4c242c             | lea                 ecx, [esp + 0x2c]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_12 = { c784243001000001000000 ff15???????? 85c0 7e3b }
            // n = 4, score = 200
            //   c784243001000001000000     | mov    dword ptr [esp + 0x130], 1
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7e3b                 | jle                 0x3d

        $sequence_13 = { 51 8d8c241c010000 51 6a01 8d542420 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   8d8c241c010000       | lea                 ecx, [esp + 0x11c]
            //   51                   | push                ecx
            //   6a01                 | push                1
            //   8d542420             | lea                 edx, [esp + 0x20]

        $sequence_14 = { 83c004 50 8d44240c 50 e8???????? a1???????? 83c40c }
            // n = 7, score = 100
            //   83c004               | add                 eax, 4
            //   50                   | push                eax
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   50                   | push                eax
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_15 = { b0e5 33ed 88442415 88442420 b98b000000 33c0 8dbc242c010000 }
            // n = 7, score = 100
            //   b0e5                 | mov                 al, 0xe5
            //   33ed                 | xor                 ebp, ebp
            //   88442415             | mov                 byte ptr [esp + 0x15], al
            //   88442420             | mov                 byte ptr [esp + 0x20], al
            //   b98b000000           | mov                 ecx, 0x8b
            //   33c0                 | xor                 eax, eax
            //   8dbc242c010000       | lea                 edi, [esp + 0x12c]

    condition:
        7 of them and filesize < 483328
}