rule win_rgdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.rgdoor."
        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.rgdoor"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { ff15???????? 483305???????? 488d15da580100 488bcb 488905???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   483305????????       |                     
            //   488d15da580100       | dec                 esp
            //   488bcb               | lea                 eax, [0x2488d]
            //   488905????????       |                     

        $sequence_1 = { 488b41f0 48635004 488d05917f0200 4889440af0 488b41f0 }
            // n = 5, score = 100
            //   488b41f0             | dec                 eax
            //   48635004             | add                 esp, 0x120
            //   488d05917f0200       | inc                 ecx
            //   4889440af0           | pop                 edi
            //   488b41f0             | pop                 edi

        $sequence_2 = { 736d 488bc3 488bfb 48c1ff05 4c8d25842f0200 83e01f }
            // n = 6, score = 100
            //   736d                 | mov                 dword ptr [esp + 0x10], ebx
            //   488bc3               | dec                 eax
            //   488bfb               | mov                 dword ptr [esp + 0x18], esi
            //   48c1ff05             | push                edi
            //   4c8d25842f0200       | dec                 eax
            //   83e01f               | sub                 esp, 0x20

        $sequence_3 = { 4c8d25d8310200 83e01f 4c6bf858 498b04fc 420fbe4c3808 83e101 7449 }
            // n = 7, score = 100
            //   4c8d25d8310200       | mov                 ecx, dword ptr [eax + ecx*8]
            //   83e01f               | dec                 eax
            //   4c6bf858             | test                ecx, ecx
            //   498b04fc             | je                  0x58c
            //   420fbe4c3808         | dec                 eax
            //   83e101               | arpl                cx, cx
            //   7449                 | dec                 eax

        $sequence_4 = { 488bc8 ff5250 4c8b16 41b90a000000 c744242001000000 4c8d055c850200 418d5102 }
            // n = 7, score = 100
            //   488bc8               | jmp                 0x548
            //   ff5250               | dec                 eax
            //   4c8b16               | lea                 edx, [0x11b1e]
            //   41b90a000000         | inc                 ecx
            //   c744242001000000     | mov                 eax, 7
            //   4c8d055c850200       | dec                 eax
            //   418d5102             | mov                 ecx, ebx

        $sequence_5 = { 488d8c2498000000 e8???????? e8???????? 8b18 899c2460010000 }
            // n = 5, score = 100
            //   488d8c2498000000     | lea                 edx, [ecx - 0x98]
            //   e8????????           |                     
            //   e8????????           |                     
            //   8b18                 | mov                 dword ptr [ebp + ecx - 0x24], edx
            //   899c2460010000       | dec                 eax

        $sequence_6 = { e8???????? 90 488d055a8f0200 488945f8 4c897d60 44897d68 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   90                   | mov                 ecx, ebx
            //   488d055a8f0200       | dec                 eax
            //   488945f8             | mov                 eax, ebx
            //   4c897d60             | dec                 eax
            //   44897d68             | add                 esp, 0x30

        $sequence_7 = { 7405 e8???????? 488b8ba0000000 488d055f4b0100 483bc8 7405 e8???????? }
            // n = 7, score = 100
            //   7405                 | mov                 edi, ecx
            //   e8????????           |                     
            //   488b8ba0000000       | dec                 eax
            //   488d055f4b0100       | lea                 eax, [0x2991c]
            //   483bc8               | dec                 eax
            //   7405                 | mov                 dword ptr [edi], eax
            //   e8????????           |                     

        $sequence_8 = { 85c0 7517 488d542438 488bcf ff15???????? 85c0 7405 }
            // n = 7, score = 100
            //   85c0                 | dec                 eax
            //   7517                 | arpl                word ptr [eax + 4], cx
            //   488d542438           | dec                 eax
            //   488bcf               | lea                 eax, [0x287fd]
            //   ff15????????         |                     
            //   85c0                 | dec                 eax
            //   7405                 | mov                 dword ptr [ecx + ebx - 0xa8], eax

        $sequence_9 = { ff15???????? 85c0 0f84a6040000 8b4cb450 e8???????? 8364b47000 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   85c0                 | int3                
            //   0f84a6040000         | dec                 eax
            //   8b4cb450             | lea                 ecx, [esp + 0x30]
            //   e8????????           |                     
            //   8364b47000           | dec                 eax

    condition:
        7 of them and filesize < 475136
}

import "pe"
/*
   Yara Rule Set
   Author: Florian Roth
   Date: 2018-01-27
   Identifier: RGDoor
   Reference: https://researchcenter.paloaltonetworks.com/2018/01/unit42-oilrig-uses-rgdoor-iis-backdoor-targets-middle-east/
*/
rule win_rgdoor_w0 {
    meta:
        author = "Florian Roth"
        description = "Detects RGDoor backdoor used by OilRig group"
        reference = "https://researchcenter.paloaltonetworks.com/2018/01/unit42-oilrig-uses-rgdoor-iis-backdoor-targets-middle-east/"
        date = "2018-01-27"
        score = 80
        hash = "a9c92b29ee05c1522715c7a2f9c543740b60e36373cb47b5620b1f3d8ad96bfa"
        malpedia_version = "20180208"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rgdoor"
    strings:
        $s1 = "MyNativeModule.dll" fullword ascii
        $s2 = "RGSESSIONID=" fullword ascii
        $s3 = "download$" fullword ascii
        $s4 = ".?AVCHelloWorld@@" fullword ascii
    condition:
        pe.imphash() == "47cb127aad6c7c9954058e61a2a6429a" or (2 of them)
}