rule win_petya_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        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 = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 8bca 88442428 8bc6 c1e810 }
            // n = 4, score = 600
            //   8bca                 | mov                 ecx, edx
            //   88442428             | mov                 byte ptr [esp + 0x28], al
            //   8bc6                 | mov                 eax, esi
            //   c1e810               | shr                 eax, 0x10

        $sequence_1 = { 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_2 = { c1eb02 57 33ff 3b750c 0f47d9 85db }
            // n = 6, score = 600
            //   c1eb02               | shr                 ebx, 2
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   3b750c               | cmp                 esi, dword ptr [ebp + 0xc]
            //   0f47d9               | cmova               ebx, ecx
            //   85db                 | test                ebx, ebx

        $sequence_3 = { 8bf1 0fa4c119 c1ee07 c1e019 0bd1 31542430 0bf0 }
            // n = 7, score = 600
            //   8bf1                 | mov                 esi, ecx
            //   0fa4c119             | shld                ecx, eax, 0x19
            //   c1ee07               | shr                 esi, 7
            //   c1e019               | shl                 eax, 0x19
            //   0bd1                 | or                  edx, ecx
            //   31542430             | xor                 dword ptr [esp + 0x30], edx
            //   0bf0                 | or                  esi, eax

        $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 = { 83c303 c1eb02 57 33ff 3b750c 0f47d9 85db }
            // n = 7, score = 600
            //   83c303               | add                 ebx, 3
            //   c1eb02               | shr                 ebx, 2
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   3b750c               | cmp                 esi, dword ptr [ebp + 0xc]
            //   0f47d9               | cmova               ebx, ecx
            //   85db                 | test                ebx, ebx

        $sequence_6 = { 85f6 7505 e8???????? 8bc7 }
            // n = 4, score = 600
            //   85f6                 | test                esi, esi
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi

        $sequence_7 = { 85db 7410 8b06 85c0 7402 ffd0 }
            // n = 6, score = 600
            //   85db                 | test                ebx, ebx
            //   7410                 | je                  0x12
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax
            //   7402                 | je                  4
            //   ffd0                 | call                eax

        $sequence_8 = { 33ff 0bf9 c1eb09 8b4c2424 0bd8 }
            // n = 5, score = 600
            //   33ff                 | xor                 edi, edi
            //   0bf9                 | or                  edi, ecx
            //   c1eb09               | shr                 ebx, 9
            //   8b4c2424             | mov                 ecx, dword ptr [esp + 0x24]
            //   0bd8                 | or                  ebx, eax

        $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
}