rule win_pteranodon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.pteranodon."
        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.pteranodon"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 50 8d4340 50 ff561c 85c0 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   8d4340               | lea                 eax, dword ptr [ebx + 0x40]
            //   50                   | push                eax
            //   ff561c               | call                dword ptr [esi + 0x1c]
            //   85c0                 | test                eax, eax

        $sequence_1 = { 8b4508 57 8d3c85d06b0310 8b0f 85c9 }
            // n = 5, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8d3c85d06b0310       | lea                 edi, dword ptr [eax*4 + 0x10036bd0]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   85c9                 | test                ecx, ecx

        $sequence_2 = { 50 ff37 e8???????? c7843524faffff0f000000 }
            // n = 4, score = 100
            //   50                   | push                eax
            //   ff37                 | push                dword ptr [edi]
            //   e8????????           |                     
            //   c7843524faffff0f000000     | mov    dword ptr [ebp + esi - 0x5dc], 0xf

        $sequence_3 = { 7512 8b04bdb8690310 807c302900 7504 32c0 }
            // n = 5, score = 100
            //   7512                 | jne                 0x14
            //   8b04bdb8690310       | mov                 eax, dword ptr [edi*4 + 0x100369b8]
            //   807c302900           | cmp                 byte ptr [eax + esi + 0x29], 0
            //   7504                 | jne                 6
            //   32c0                 | xor                 al, al

        $sequence_4 = { c705????????01000000 c705????????01000000 6a04 58 6bc000 c780d460031002000000 6a04 }
            // n = 7, score = 100
            //   c705????????01000000     |     
            //   c705????????01000000     |     
            //   6a04                 | push                4
            //   58                   | pop                 eax
            //   6bc000               | imul                eax, eax, 0
            //   c780d460031002000000     | mov    dword ptr [eax + 0x100360d4], 2
            //   6a04                 | push                4

        $sequence_5 = { 7213 40 8d8dd8f8ffff 50 ffb5d8f8ffff e8???????? }
            // n = 6, score = 100
            //   7213                 | jb                  0x15
            //   40                   | inc                 eax
            //   8d8dd8f8ffff         | lea                 ecx, dword ptr [ebp - 0x728]
            //   50                   | push                eax
            //   ffb5d8f8ffff         | push                dword ptr [ebp - 0x728]
            //   e8????????           |                     

        $sequence_6 = { 57 6af6 ff15???????? 8b049db8690310 8b4dfc }
            // n = 5, score = 100
            //   57                   | push                edi
            //   6af6                 | push                -0xa
            //   ff15????????         |                     
            //   8b049db8690310       | mov                 eax, dword ptr [ebx*4 + 0x100369b8]
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_7 = { 58 0fb60c85feef0210 0fb63485ffef0210 8bf9 8985a4f8ffff c1e702 }
            // n = 6, score = 100
            //   58                   | pop                 eax
            //   0fb60c85feef0210     | movzx               ecx, byte ptr [eax*4 + 0x1002effe]
            //   0fb63485ffef0210     | movzx               esi, byte ptr [eax*4 + 0x1002efff]
            //   8bf9                 | mov                 edi, ecx
            //   8985a4f8ffff         | mov                 dword ptr [ebp - 0x75c], eax
            //   c1e702               | shl                 edi, 2

        $sequence_8 = { 7204 8b02 eb02 8bc2 c60000 803b00 7504 }
            // n = 7, score = 100
            //   7204                 | jb                  6
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   eb02                 | jmp                 4
            //   8bc2                 | mov                 eax, edx
            //   c60000               | mov                 byte ptr [eax], 0
            //   803b00               | cmp                 byte ptr [ebx], 0
            //   7504                 | jne                 6

        $sequence_9 = { 7ed0 83c8ff eb07 8b04f5b49b0210 5f }
            // n = 5, score = 100
            //   7ed0                 | jle                 0xffffffd2
            //   83c8ff               | or                  eax, 0xffffffff
            //   eb07                 | jmp                 9
            //   8b04f5b49b0210       | mov                 eax, dword ptr [esi*8 + 0x10029bb4]
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 499712
}