rule win_pteranodon_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.pteranodon"
        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 = { e9???????? c745dc03000000 eb7c c745e068d80210 }
            // n = 4, score = 100
            //   e9????????           |                     
            //   c745dc03000000       | mov                 dword ptr [ebp - 0x24], 3
            //   eb7c                 | jmp                 0x7e
            //   c745e068d80210       | mov                 dword ptr [ebp - 0x20], 0x1002d868

        $sequence_1 = { 7572 83ec18 8bcc 8965f0 c741140f000000 c7411000000000 83791410 }
            // n = 7, score = 100
            //   7572                 | jne                 0x74
            //   83ec18               | sub                 esp, 0x18
            //   8bcc                 | mov                 ecx, esp
            //   8965f0               | mov                 dword ptr [ebp - 0x10], esp
            //   c741140f000000       | mov                 dword ptr [ecx + 0x14], 0xf
            //   c7411000000000       | mov                 dword ptr [ecx + 0x10], 0
            //   83791410             | cmp                 dword ptr [ecx + 0x14], 0x10

        $sequence_2 = { e8???????? 8b4dfc 83c404 33cd 32c0 5f 5e }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c404               | add                 esp, 4
            //   33cd                 | xor                 ecx, ebp
            //   32c0                 | xor                 al, al
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { 83c404 6aff 6a00 50 8d8d78f8ffff c645fc1b }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   6aff                 | push                -1
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d8d78f8ffff         | lea                 ecx, [ebp - 0x788]
            //   c645fc1b             | mov                 byte ptr [ebp - 4], 0x1b

        $sequence_4 = { 8a45d7 0fb6f0 eb5c 85f6 0f854fffffff 83f910 }
            // n = 6, score = 100
            //   8a45d7               | mov                 al, byte ptr [ebp - 0x29]
            //   0fb6f0               | movzx               esi, al
            //   eb5c                 | jmp                 0x5e
            //   85f6                 | test                esi, esi
            //   0f854fffffff         | jne                 0xffffff55
            //   83f910               | cmp                 ecx, 0x10

        $sequence_5 = { 83e802 0f84cf000000 32db e9???????? c6433d00 8b55ec 8d45d8 }
            // n = 7, score = 100
            //   83e802               | sub                 eax, 2
            //   0f84cf000000         | je                  0xd5
            //   32db                 | xor                 bl, bl
            //   e9????????           |                     
            //   c6433d00             | mov                 byte ptr [ebx + 0x3d], 0
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8d45d8               | lea                 eax, [ebp - 0x28]

        $sequence_6 = { 50 e8???????? 83c404 8d85fcfaffff 50 e8???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d85fcfaffff         | lea                 eax, [ebp - 0x504]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { e8???????? 8d85d8f8ffff c645fc17 50 ba???????? 8d8df0f8ffff e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d85d8f8ffff         | lea                 eax, [ebp - 0x728]
            //   c645fc17             | mov                 byte ptr [ebp - 4], 0x17
            //   50                   | push                eax
            //   ba????????           |                     
            //   8d8df0f8ffff         | lea                 ecx, [ebp - 0x710]
            //   e8????????           |                     

        $sequence_8 = { 0f8e6fffffff 83c8ff eb07 8b04cd04f80210 5f }
            // n = 5, score = 100
            //   0f8e6fffffff         | jle                 0xffffff75
            //   83c8ff               | or                  eax, 0xffffffff
            //   eb07                 | jmp                 9
            //   8b04cd04f80210       | mov                 eax, dword ptr [ecx*8 + 0x1002f804]
            //   5f                   | pop                 edi

        $sequence_9 = { 394508 7c1f 3934bdb8690310 7531 e8???????? 8904bdb8690310 85c0 }
            // n = 7, score = 100
            //   394508               | cmp                 dword ptr [ebp + 8], eax
            //   7c1f                 | jl                  0x21
            //   3934bdb8690310       | cmp                 dword ptr [edi*4 + 0x100369b8], esi
            //   7531                 | jne                 0x33
            //   e8????????           |                     
            //   8904bdb8690310       | mov                 dword ptr [edi*4 + 0x100369b8], eax
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 499712
}