rule win_rockloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.rockloader."
        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.rockloader"
        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 = { 50 be04010000 56 ff15???????? 33ff }
            // n = 5, score = 300
            //   50                   | push                eax
            //   be04010000           | mov                 esi, 0x104
            //   56                   | push                esi
            //   ff15????????         |                     
            //   33ff                 | xor                 edi, edi

        $sequence_1 = { 59 8bc1 03f1 48 742d 48 }
            // n = 6, score = 300
            //   59                   | pop                 ecx
            //   8bc1                 | mov                 eax, ecx
            //   03f1                 | add                 esi, ecx
            //   48                   | dec                 eax
            //   742d                 | je                  0x2f
            //   48                   | dec                 eax

        $sequence_2 = { 8a06 3c22 750c ff7508 8bc6 e8???????? }
            // n = 6, score = 300
            //   8a06                 | mov                 al, byte ptr [esi]
            //   3c22                 | cmp                 al, 0x22
            //   750c                 | jne                 0xe
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     

        $sequence_3 = { 53 53 53 53 53 8d8590fdffff }
            // n = 6, score = 300
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d8590fdffff         | lea                 eax, dword ptr [ebp - 0x270]

        $sequence_4 = { 83ec18 48 c7042400000000 eb0b 48 8b0424 48 }
            // n = 7, score = 300
            //   83ec18               | sub                 esp, 0x18
            //   48                   | dec                 eax
            //   c7042400000000       | mov                 dword ptr [esp], 0
            //   eb0b                 | jmp                 0xd
            //   48                   | dec                 eax
            //   8b0424               | mov                 eax, dword ptr [esp]
            //   48                   | dec                 eax

        $sequence_5 = { e8???????? 33f6 53 8975f8 }
            // n = 4, score = 300
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi
            //   53                   | push                ebx
            //   8975f8               | mov                 dword ptr [ebp - 8], esi

        $sequence_6 = { 8b4f10 83671000 894f20 80383a 7407 }
            // n = 5, score = 300
            //   8b4f10               | mov                 ecx, dword ptr [edi + 0x10]
            //   83671000             | and                 dword ptr [edi + 0x10], 0
            //   894f20               | mov                 dword ptr [edi + 0x20], ecx
            //   80383a               | cmp                 byte ptr [eax], 0x3a
            //   7407                 | je                  9

        $sequence_7 = { 3b75f4 7ce9 ff75f8 ff15???????? e9???????? }
            // n = 5, score = 300
            //   3b75f4               | cmp                 esi, dword ptr [ebp - 0xc]
            //   7ce9                 | jl                  0xffffffeb
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   e9????????           |                     

        $sequence_8 = { 83c706 81f9ff030000 0f8796000000 b9ff030000 23d9 c1e30a 23c1 }
            // n = 7, score = 300
            //   83c706               | add                 edi, 6
            //   81f9ff030000         | cmp                 ecx, 0x3ff
            //   0f8796000000         | ja                  0x9c
            //   b9ff030000           | mov                 ecx, 0x3ff
            //   23d9                 | and                 ebx, ecx
            //   c1e30a               | shl                 ebx, 0xa
            //   23c1                 | and                 eax, ecx

        $sequence_9 = { dfe0 f6c441 7a54 dd05???????? dc5df8 dfe0 }
            // n = 6, score = 300
            //   dfe0                 | fnstsw              ax
            //   f6c441               | test                ah, 0x41
            //   7a54                 | jp                  0x56
            //   dd05????????         |                     
            //   dc5df8               | fcomp               qword ptr [ebp - 8]
            //   dfe0                 | fnstsw              ax

    condition:
        7 of them and filesize < 98304
}