rule win_petya_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.petya"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 0facc118 0fa4df03 c1e818 884c242c 8bc6 8bca }
            // n = 6, score = 600
            //   0facc118             | shrd                ecx, eax, 0x18
            //   0fa4df03             | shld                edi, ebx, 3
            //   c1e818               | shr                 eax, 0x18
            //   884c242c             | mov                 byte ptr [esp + 0x2c], cl
            //   8bc6                 | mov                 eax, esi
            //   8bca                 | mov                 ecx, edx

        $sequence_1 = { e8???????? 8bf8 85f6 7505 }
            // n = 4, score = 600
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7

        $sequence_2 = { 8b5d0c 33c9 56 8b7508 2bde 83c303 }
            // n = 6, score = 600
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   33c9                 | xor                 ecx, ecx
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   2bde                 | sub                 ebx, esi
            //   83c303               | add                 ebx, 3

        $sequence_3 = { e8???????? 8b4604 83c40c 8b4e08 c1e002 }
            // n = 5, score = 600
            //   e8????????           |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   83c40c               | add                 esp, 0xc
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   c1e002               | shl                 eax, 2

        $sequence_4 = { 0f42f2 6a04 56 e8???????? 8bd8 }
            // n = 5, score = 600
            //   0f42f2               | cmovb               esi, edx
            //   6a04                 | push                4
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_5 = { 50 e8???????? ff7618 8d857cfeffff 50 ffb63c010000 }
            // n = 6, score = 600
            //   50                   | push                eax
            //   e8????????           |                     
            //   ff7618               | push                dword ptr [esi + 0x18]
            //   8d857cfeffff         | lea                 eax, [ebp - 0x184]
            //   50                   | push                eax
            //   ffb63c010000         | push                dword ptr [esi + 0x13c]

        $sequence_6 = { c1e818 884c242c 8bc6 8bca }
            // n = 4, score = 600
            //   c1e818               | shr                 eax, 0x18
            //   884c242c             | mov                 byte ptr [esp + 0x2c], cl
            //   8bc6                 | mov                 eax, esi
            //   8bca                 | mov                 ecx, edx

        $sequence_7 = { 85f6 7414 8b442414 56 83c050 }
            // n = 5, score = 600
            //   85f6                 | test                esi, esi
            //   7414                 | je                  0x16
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   56                   | push                esi
            //   83c050               | add                 eax, 0x50

        $sequence_8 = { 80f90a 1ac0 80c157 24d9 }
            // n = 4, score = 600
            //   80f90a               | cmp                 cl, 0xa
            //   1ac0                 | sbb                 al, al
            //   80c157               | add                 cl, 0x57
            //   24d9                 | and                 al, 0xd9

        $sequence_9 = { 8bf8 85f6 7505 e8???????? 8bc7 }
            // n = 5, score = 600
            //   8bf8                 | mov                 edi, eax
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi

    condition:
        7 of them and filesize < 229376
}