rule win_pteranodon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 6bc830 881f 8b0495b8690310 f644082880 7507 }
            // n = 5, score = 100
            //   6bc830               | imul                ecx, eax, 0x30
            //   881f                 | mov                 byte ptr [edi], bl
            //   8b0495b8690310       | mov                 eax, dword ptr [edx*4 + 0x100369b8]
            //   f644082880           | test                byte ptr [eax + ecx + 0x28], 0x80
            //   7507                 | jne                 9

        $sequence_1 = { 8bcb c645fc03 8d5102 660f1f440000 668b01 }
            // n = 5, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d5102               | lea                 edx, [ecx + 2]
            //   660f1f440000         | nop                 word ptr [eax + eax]
            //   668b01               | mov                 ax, word ptr [ecx]

        $sequence_2 = { 83c418 03d8 13fa eb0c 039d88feffff 13bd84feffff }
            // n = 6, score = 100
            //   83c418               | add                 esp, 0x18
            //   03d8                 | add                 ebx, eax
            //   13fa                 | adc                 edi, edx
            //   eb0c                 | jmp                 0xe
            //   039d88feffff         | add                 ebx, dword ptr [ebp - 0x178]
            //   13bd84feffff         | adc                 edi, dword ptr [ebp - 0x17c]

        $sequence_3 = { 6bc038 03048de0874300 50 ff15???????? 5d c3 }
            // n = 6, score = 100
            //   6bc038               | imul                eax, eax, 0x38
            //   03048de0874300       | add                 eax, dword ptr [ecx*4 + 0x4387e0]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_4 = { c70021000000 eb44 c745e002000000 c745e4e4c14200 8b4508 8bcf 8b7510 }
            // n = 7, score = 100
            //   c70021000000         | mov                 dword ptr [eax], 0x21
            //   eb44                 | jmp                 0x46
            //   c745e002000000       | mov                 dword ptr [ebp - 0x20], 2
            //   c745e4e4c14200       | mov                 dword ptr [ebp - 0x1c], 0x42c1e4
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8bcf                 | mov                 ecx, edi
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]

        $sequence_5 = { 8b01 85c0 0f84309e0000 83f808 }
            // n = 4, score = 100
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   85c0                 | test                eax, eax
            //   0f84309e0000         | je                  0x9e36
            //   83f808               | cmp                 eax, 8

        $sequence_6 = { 6bc038 03048de0874300 eb05 b8???????? f6402820 }
            // n = 5, score = 100
            //   6bc038               | imul                eax, eax, 0x38
            //   03048de0874300       | add                 eax, dword ptr [ecx*4 + 0x4387e0]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6402820             | test                byte ptr [eax + 0x28], 0x20

        $sequence_7 = { c78504f9ffff0f000000 c78500f9ffff00000000 c685f0f8ffff00 83f810 7213 40 8d8dc0f8ffff }
            // n = 7, score = 100
            //   c78504f9ffff0f000000     | mov    dword ptr [ebp - 0x6fc], 0xf
            //   c78500f9ffff00000000     | mov    dword ptr [ebp - 0x700], 0
            //   c685f0f8ffff00       | mov                 byte ptr [ebp - 0x710], 0
            //   83f810               | cmp                 eax, 0x10
            //   7213                 | jb                  0x15
            //   40                   | inc                 eax
            //   8d8dc0f8ffff         | lea                 ecx, [ebp - 0x740]

        $sequence_8 = { 50 e8???????? 8b4de0 8d0437 83c40c }
            // n = 5, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8d0437               | lea                 eax, [edi + esi]
            //   83c40c               | add                 esp, 0xc

        $sequence_9 = { 33c0 53 668906 ff75c0 8935???????? ff75bc 68???????? }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   53                   | push                ebx
            //   668906               | mov                 word ptr [esi], ax
            //   ff75c0               | push                dword ptr [ebp - 0x40]
            //   8935????????         |                     
            //   ff75bc               | push                dword ptr [ebp - 0x44]
            //   68????????           |                     

        $sequence_10 = { 6a01 51 56 ff15???????? 85c0 752b 85f6 }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   752b                 | jne                 0x2d
            //   85f6                 | test                esi, esi

        $sequence_11 = { 6a00 8d45d4 c745fc00000000 50 8d45d0 c745d401000000 50 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   50                   | push                eax
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   c745d401000000       | mov                 dword ptr [ebp - 0x2c], 1
            //   50                   | push                eax

        $sequence_12 = { 85db 7443 3bf8 7f0c 7c04 }
            // n = 5, score = 100
            //   85db                 | test                ebx, ebx
            //   7443                 | je                  0x45
            //   3bf8                 | cmp                 edi, eax
            //   7f0c                 | jg                  0xe
            //   7c04                 | jl                  6

        $sequence_13 = { 33ff 8db58cf6ffff 89bd90f6ffff 8d9d20f9ffff }
            // n = 4, score = 100
            //   33ff                 | xor                 edi, edi
            //   8db58cf6ffff         | lea                 esi, [ebp - 0x974]
            //   89bd90f6ffff         | mov                 dword ptr [ebp - 0x970], edi
            //   8d9d20f9ffff         | lea                 ebx, [ebp - 0x6e0]

        $sequence_14 = { 8d85f0feffff 50 ff15???????? 85c0 7510 }
            // n = 5, score = 100
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7510                 | jne                 0x12

        $sequence_15 = { 83c618 8bbd90f6ffff 03f8 8b8598f6ffff 40 89bd90f6ffff 898598f6ffff }
            // n = 7, score = 100
            //   83c618               | add                 esi, 0x18
            //   8bbd90f6ffff         | mov                 edi, dword ptr [ebp - 0x970]
            //   03f8                 | add                 edi, eax
            //   8b8598f6ffff         | mov                 eax, dword ptr [ebp - 0x968]
            //   40                   | inc                 eax
            //   89bd90f6ffff         | mov                 dword ptr [ebp - 0x970], edi
            //   898598f6ffff         | mov                 dword ptr [ebp - 0x968], eax

    condition:
        7 of them and filesize < 499712
}