rule win_rgdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 448be8 4584e4 0f85a3010000 8a0f 4c8b6c2458 488d155a2d0200 80f90a }
            // n = 7, score = 100
            //   448be8               | mov                 edi, eax
            //   4584e4               | dec                 edx
            //   0f85a3010000         | mov                 eax, dword ptr [eax + ebp*8 + 0x33f50]
            //   8a0f                 | inc                 eax
            //   4c8b6c2458           | setne               bh
            //   488d155a2d0200       | add                 esi, esi
            //   80f90a               | inc                 edx

        $sequence_1 = { 488d5598 48837db010 480f435598 4c8bc0 90 0fb60a }
            // n = 6, score = 100
            //   488d5598             | mov                 eax, 1
            //   48837db010           | dec                 eax
            //   480f435598           | or                  edx, 0xffffffff
            //   4c8bc0               | mov                 edx, 0xa
            //   90                   | dec                 esp
            //   0fb60a               | lea                 edx, [0xfffe7e29]

        $sequence_2 = { f6c202 488d542430 7438 4c8d05d24b0200 488d8c2480000000 e8???????? 488d053e4e0200 }
            // n = 7, score = 100
            //   f6c202               | jne                 0xe49
            //   488d542430           | dec                 eax
            //   7438                 | lea                 ecx, [0x28c72]
            //   4c8d05d24b0200       | jmp                 0xe4b
            //   488d8c2480000000     | dec                 esp
            //   e8????????           |                     
            //   488d053e4e0200       | mov                 eax, edx

        $sequence_3 = { 488d053a540200 488bd9 488901 b908000000 e8???????? 33f6 488bf8 }
            // n = 7, score = 100
            //   488d053a540200       | dec                 ebp
            //   488bd9               | mov                 ebp, eax
            //   488901               | dec                 esp
            //   b908000000           | lea                 edx, [0xfffe81e9]
            //   e8????????           |                     
            //   33f6                 | and                 eax, 0x1f
            //   488bf8               | dec                 ecx

        $sequence_4 = { 48895c2430 895c2428 897c2420 4533c9 4533c0 }
            // n = 5, score = 100
            //   48895c2430           | inc                 ecx
            //   895c2428             | cmp                 byte ptr [eax], al
            //   897c2420             | sete                al
            //   4533c9               | test                eax, eax
            //   4533c0               | je                  0x202

        $sequence_5 = { 85c0 747b 488d0d15700000 ff15???????? }
            // n = 4, score = 100
            //   85c0                 | dec                 eax
            //   747b                 | lea                 edx, [0x28894]
            //   488d0d15700000       | dec                 eax
            //   ff15????????         |                     

        $sequence_6 = { 4983c402 e9???????? 4c8be0 e9???????? 4b8b8cea503f0300 }
            // n = 5, score = 100
            //   4983c402             | add                 eax, 0x10
            //   e9????????           |                     
            //   4c8be0               | dec                 eax
            //   e9????????           |                     
            //   4b8b8cea503f0300     | add                 esp, 0x28

        $sequence_7 = { 488d05e199feff 4a8b84e8503f0300 42f644380804 7402 }
            // n = 4, score = 100
            //   488d05e199feff       | mov                 dword ptr [edx + 0x10], eax
            //   4a8b84e8503f0300     | mov                 byte ptr [edx], al
            //   42f644380804         | dec                 eax
            //   7402                 | lea                 edx, [0x2962e]

        $sequence_8 = { ff15???????? 488d15a7580100 483305???????? 488bcb 488905???????? ff15???????? 488d15a1580100 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   488d15a7580100       | dec                 esp
            //   483305????????       |                     
            //   488bcb               | mov                 esp, ecx
            //   488905????????       |                     
            //   ff15????????         |                     
            //   488d15a1580100       | inc                 ebp

        $sequence_9 = { 4883ec20 488bd9 e8???????? 488d059fb40100 488903 488bc3 }
            // n = 6, score = 100
            //   4883ec20             | dec                 eax
            //   488bd9               | lea                 ecx, [0x22c0f]
            //   e8????????           |                     
            //   488d059fb40100       | dec                 esp
            //   488903               | mov                 dword ptr [esp + 0x20], ebp
            //   488bc3               | dec                 esp

    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)
}