rule win_petya_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { ff7510 56 ff7508 e8???????? 8bf8 85f6 7505 }
            // n = 7, score = 600
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   56                   | push                esi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7

        $sequence_1 = { 8bc6 8bca 0fa4c117 8bda c1e60e c1e017 33ff }
            // n = 7, score = 600
            //   8bc6                 | mov                 eax, esi
            //   8bca                 | mov                 ecx, edx
            //   0fa4c117             | shld                ecx, eax, 0x17
            //   8bda                 | mov                 ebx, edx
            //   c1e60e               | shl                 esi, 0xe
            //   c1e017               | shl                 eax, 0x17
            //   33ff                 | xor                 edi, edi

        $sequence_2 = { 83c050 03c7 53 50 e8???????? 83c40c }
            // n = 6, score = 600
            //   83c050               | add                 eax, 0x50
            //   03c7                 | add                 eax, edi
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

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

        $sequence_4 = { 31542424 33d2 0fa4c119 c1ee07 }
            // n = 4, score = 600
            //   31542424             | xor                 dword ptr [esp + 0x24], edx
            //   33d2                 | xor                 edx, edx
            //   0fa4c119             | shld                ecx, eax, 0x19
            //   c1ee07               | shr                 esi, 7

        $sequence_5 = { 8bc6 8bca c1e303 0facc110 }
            // n = 4, score = 600
            //   8bc6                 | mov                 eax, esi
            //   8bca                 | mov                 ecx, edx
            //   c1e303               | shl                 ebx, 3
            //   0facc110             | shrd                ecx, eax, 0x10

        $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 = { 3bf2 53 0f42f2 6a04 56 e8???????? 8bd8 }
            // n = 7, score = 600
            //   3bf2                 | cmp                 esi, edx
            //   53                   | push                ebx
            //   0f42f2               | cmovb               esi, edx
            //   6a04                 | push                4
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_8 = { 83c40c 8d5750 8bcf e8???????? 035c2410 }
            // n = 5, score = 600
            //   83c40c               | add                 esp, 0xc
            //   8d5750               | lea                 edx, [edi + 0x50]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   035c2410             | add                 ebx, dword ptr [esp + 0x10]

        $sequence_9 = { 57 33ff 8d0486 8bd8 2bde 83c303 c1eb02 }
            // n = 7, score = 600
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   8d0486               | lea                 eax, [esi + eax*4]
            //   8bd8                 | mov                 ebx, eax
            //   2bde                 | sub                 ebx, esi
            //   83c303               | add                 ebx, 3
            //   c1eb02               | shr                 ebx, 2

    condition:
        7 of them and filesize < 229376
}