rule win_petya_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.petya"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 743a 53 56 8b35???????? 33c9 }
            // n = 5, score = 600
            //   743a                 | je                  0x3c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b35????????         |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_1 = { 53 0f42f2 6a04 56 }
            // n = 4, score = 600
            //   53                   | push                ebx
            //   0f42f2               | cmovb               esi, edx
            //   6a04                 | push                4
            //   56                   | push                esi

        $sequence_2 = { 8d4e10 e8???????? 8d4e1c e8???????? 8d4e28 e8???????? 8d4e4c }
            // n = 7, score = 600
            //   8d4e10               | lea                 ecx, [esi + 0x10]
            //   e8????????           |                     
            //   8d4e1c               | lea                 ecx, [esi + 0x1c]
            //   e8????????           |                     
            //   8d4e28               | lea                 ecx, [esi + 0x28]
            //   e8????????           |                     
            //   8d4e4c               | lea                 ecx, [esi + 0x4c]

        $sequence_3 = { 8d0486 8bd8 2bde 83c303 }
            // n = 4, score = 600
            //   8d0486               | lea                 eax, [esi + eax*4]
            //   8bd8                 | mov                 ebx, eax
            //   2bde                 | sub                 ebx, esi
            //   83c303               | add                 ebx, 3

        $sequence_4 = { 33db 8b4e74 03cb e8???????? 47 }
            // n = 5, score = 600
            //   33db                 | xor                 ebx, ebx
            //   8b4e74               | mov                 ecx, dword ptr [esi + 0x74]
            //   03cb                 | add                 ecx, ebx
            //   e8????????           |                     
            //   47                   | inc                 edi

        $sequence_5 = { 8bce e8???????? 8b4b58 03c9 3bc1 }
            // n = 5, score = 600
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b4b58               | mov                 ecx, dword ptr [ebx + 0x58]
            //   03c9                 | add                 ecx, ecx
            //   3bc1                 | cmp                 eax, ecx

        $sequence_6 = { 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_7 = { a1???????? 85c0 743a 53 56 8b35???????? }
            // n = 6, score = 600
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   743a                 | je                  0x3c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b35????????         |                     

        $sequence_8 = { 8b4c2414 33fe 8bf0 33da }
            // n = 4, score = 600
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   33fe                 | xor                 edi, esi
            //   8bf0                 | mov                 esi, eax
            //   33da                 | xor                 ebx, edx

        $sequence_9 = { 50 e8???????? 83c40c 8d5750 8bcf }
            // n = 5, score = 600
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d5750               | lea                 edx, [edi + 0x50]
            //   8bcf                 | mov                 ecx, edi

    condition:
        7 of them and filesize < 229376
}