rule win_rustock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.rustock"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 0f848b000000 8365fc00 83c003 83e0fc }
            // n = 4, score = 100
            //   0f848b000000         | je                  0x91
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   83c003               | add                 eax, 3
            //   83e0fc               | and                 eax, 0xfffffffc

        $sequence_1 = { 8901 eb03 8b5dbc 837de000 }
            // n = 4, score = 100
            //   8901                 | mov                 dword ptr [ecx], eax
            //   eb03                 | jmp                 5
            //   8b5dbc               | mov                 ebx, dword ptr [ebp - 0x44]
            //   837de000             | cmp                 dword ptr [ebp - 0x20], 0

        $sequence_2 = { 68f1020000 57 a3???????? ffd6 68e1020000 }
            // n = 5, score = 100
            //   68f1020000           | push                0x2f1
            //   57                   | push                edi
            //   a3????????           |                     
            //   ffd6                 | call                esi
            //   68e1020000           | push                0x2e1

        $sequence_3 = { 83ec04 893c24 83ec04 891424 89d7 }
            // n = 5, score = 100
            //   83ec04               | sub                 esp, 4
            //   893c24               | mov                 dword ptr [esp], edi
            //   83ec04               | sub                 esp, 4
            //   891424               | mov                 dword ptr [esp], edx
            //   89d7                 | mov                 edi, edx

        $sequence_4 = { 7410 8088????????20 8a8c05ecfcffff ebe3 80a04031040100 }
            // n = 5, score = 100
            //   7410                 | je                  0x12
            //   8088????????20       |                     
            //   8a8c05ecfcffff       | mov                 cl, byte ptr [ebp + eax - 0x314]
            //   ebe3                 | jmp                 0xffffffe5
            //   80a04031040100       | and                 byte ptr [eax + 0x1043140], 0

        $sequence_5 = { 8d043f 50 e8???????? 59 8945d0 }
            // n = 5, score = 100
            //   8d043f               | lea                 eax, [edi + edi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax

        $sequence_6 = { 3bfe 7503 4b 75e7 }
            // n = 4, score = 100
            //   3bfe                 | cmp                 edi, esi
            //   7503                 | jne                 5
            //   4b                   | dec                 ebx
            //   75e7                 | jne                 0xffffffe9

        $sequence_7 = { 6800400000 ff15???????? 50 ff15???????? 6a00 }
            // n = 5, score = 100
            //   6800400000           | push                0x4000
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_8 = { ff15???????? ff35???????? 59 0315???????? 31c9 85c9 7502 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   ff35????????         |                     
            //   59                   | pop                 ecx
            //   0315????????         |                     
            //   31c9                 | xor                 ecx, ecx
            //   85c9                 | test                ecx, ecx
            //   7502                 | jne                 4

        $sequence_9 = { 85c0 6a04 6a00 7409 8d85fcfeffff 50 eb03 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   6a04                 | push                4
            //   6a00                 | push                0
            //   7409                 | je                  0xb
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   50                   | push                eax
            //   eb03                 | jmp                 5

    condition:
        7 of them and filesize < 565248
}