rule win_petya_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.petya."
        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.petya"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 33da 0facc80e c1e612 33d2 0bd0 c1e90e 8b442420 }
            // n = 7, score = 600
            //   33da                 | xor                 ebx, edx
            //   0facc80e             | shrd                eax, ecx, 0xe
            //   c1e612               | shl                 esi, 0x12
            //   33d2                 | xor                 edx, edx
            //   0bd0                 | or                  edx, eax
            //   c1e90e               | shr                 ecx, 0xe
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_1 = { 8d4e1c e8???????? 8d4e28 e8???????? 8d4e4c e8???????? 837e7400 }
            // n = 7, score = 600
            //   8d4e1c               | lea                 ecx, dword ptr [esi + 0x1c]
            //   e8????????           |                     
            //   8d4e28               | lea                 ecx, dword ptr [esi + 0x28]
            //   e8????????           |                     
            //   8d4e4c               | lea                 ecx, dword ptr [esi + 0x4c]
            //   e8????????           |                     
            //   837e7400             | cmp                 dword ptr [esi + 0x74], 0

        $sequence_2 = { a1???????? 85c0 743a 53 56 8b35???????? 33c9 }
            // n = 7, score = 600
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   743a                 | je                  0x3c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b35????????         |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_3 = { 85f6 7505 e8???????? 8bc7 5f 5e }
            // n = 6, score = 600
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_4 = { 33c9 57 33ff 8d0486 }
            // n = 4, score = 600
            //   33c9                 | xor                 ecx, ecx
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   8d0486               | lea                 eax, dword ptr [esi + eax*4]

        $sequence_5 = { 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_6 = { 0bd0 8b442430 03ce 13c2 03cb }
            // n = 5, score = 600
            //   0bd0                 | or                  edx, eax
            //   8b442430             | mov                 eax, dword ptr [esp + 0x30]
            //   03ce                 | add                 ecx, esi
            //   13c2                 | adc                 eax, edx
            //   03cb                 | add                 ecx, ebx

        $sequence_7 = { 2bde 83c303 c1eb02 57 33ff 3b750c }
            // n = 6, score = 600
            //   2bde                 | sub                 ebx, esi
            //   83c303               | add                 ebx, 3
            //   c1eb02               | shr                 ebx, 2
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   3b750c               | cmp                 esi, dword ptr [ebp + 0xc]

        $sequence_8 = { 68???????? ff15???????? 50 ff15???????? 8d4df8 51 6a06 }
            // n = 7, score = 600
            //   68????????           |                     
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d4df8               | lea                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx
            //   6a06                 | push                6

        $sequence_9 = { 50 e8???????? 83c40c 8d5750 8bcf e8???????? }
            // n = 6, score = 600
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d5750               | lea                 edx, dword ptr [edi + 0x50]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 229376
}