rule win_naikon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-01-05"
        version = "1"
        description = "Detects win.naikon."
        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.naikon"
        malpedia_rule_date = "20260105"
        malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79"
        malpedia_version = "20251219"
        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 = { 8bf8 59 3bfb 59 741d 8b06 2bc7 }
            // n = 7, score = 200
            //   8bf8                 | mov                 edi, eax
            //   59                   | pop                 ecx
            //   3bfb                 | cmp                 edi, ebx
            //   59                   | pop                 ecx
            //   741d                 | je                  0x1f
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   2bc7                 | sub                 eax, edi

        $sequence_1 = { eb05 397df8 7415 8d45f0 }
            // n = 4, score = 200
            //   eb05                 | jmp                 7
            //   397df8               | cmp                 dword ptr [ebp - 8], edi
            //   7415                 | je                  0x17
            //   8d45f0               | lea                 eax, [ebp - 0x10]

        $sequence_2 = { 8975c4 8945b0 8b450c 8945bc 03f0 8b45e4 8b4f6c }
            // n = 7, score = 200
            //   8975c4               | mov                 dword ptr [ebp - 0x3c], esi
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8945bc               | mov                 dword ptr [ebp - 0x44], eax
            //   03f0                 | add                 esi, eax
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b4f6c               | mov                 ecx, dword ptr [edi + 0x6c]

        $sequence_3 = { 53 50 e8???????? 6a04 8d85f8fdffff 68???????? 50 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a04                 | push                4
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_4 = { 8b06 03c3 68???????? 50 e8???????? 68???????? e9???????? }
            // n = 7, score = 200
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   03c3                 | add                 eax, ebx
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   68????????           |                     
            //   e9????????           |                     

        $sequence_5 = { 03c8 83c00c 8903 8d45d8 6a0c 50 ff750c }
            // n = 7, score = 200
            //   03c8                 | add                 ecx, eax
            //   83c00c               | add                 eax, 0xc
            //   8903                 | mov                 dword ptr [ebx], eax
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   6a0c                 | push                0xc
            //   50                   | push                eax
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_6 = { e8???????? ff75fc e8???????? 83c414 eb02 33db }
            // n = 6, score = 200
            //   e8????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   eb02                 | jmp                 4
            //   33db                 | xor                 ebx, ebx

        $sequence_7 = { 6a10 68???????? e9???????? 6a00 ff75fc 53 8d853cffffff }
            // n = 7, score = 200
            //   6a10                 | push                0x10
            //   68????????           |                     
            //   e9????????           |                     
            //   6a00                 | push                0
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   53                   | push                ebx
            //   8d853cffffff         | lea                 eax, [ebp - 0xc4]

        $sequence_8 = { 8b00 52 53 53 8b4010 }
            // n = 5, score = 200
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   52                   | push                edx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8b4010               | mov                 eax, dword ptr [eax + 0x10]

        $sequence_9 = { 838e90000000ff 8dbe8c000000 85c0 740a 50 ff15???????? }
            // n = 6, score = 200
            //   838e90000000ff       | or                  dword ptr [esi + 0x90], 0xffffffff
            //   8dbe8c000000         | lea                 edi, [esi + 0x8c]
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   50                   | push                eax
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 188416
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_naikon_w0 {
    meta:
        description = "Naikon code features"
        author = "Seth Hardy"
        last_modified = "2014-06-25"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.naikon"
        malpedia_version = "20170618"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    
    strings:
        // decryption
        $ = { 0F AF C1 C1 E0 1F } // imul eax, ecx; shl eah, 1fh
        $ = { 35 5A 01 00 00} // xor eax, 15ah
        $ = { 81 C2 7F 14 06 00 } // add edx, 6147fh
    
    condition:
        all of them
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_naikon_w1 {
    meta:
        description = "Naikon Identifying Strings"
        author = "Seth Hardy"
        last_modified = "2014-06-25"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.naikon"
        malpedia_version = "20170618"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        
    strings:
        $ = "NOKIAN95/WEB"
        $ = "/tag=info&id=15"
        $ = "skg(3)=&3.2d_u1"
        $ = "\\Temp\\iExplorer.exe"
        $ = "\\Temp\\\"TSG\""
        
    condition:
       any of them
}

rule win_naikon_w2 {
    meta:
        description = "Detects backdoors related to the Naikon APT"
        author = "Florian Roth"
        reference = "https://goo.gl/7vHyvh"
        date = "2015-05-14"
        hash = "d5716c80cba8554eb79eecfb4aa3d99faf0435a1833ec5ef51f528146c758eba"
        hash = "f5ab8e49c0778fa208baad660fe4fa40fc8a114f5f71614afbd6dcc09625cb96"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.naikon"
        malpedia_version = "20170618"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $x0 = "GET http://%s:%d/aspxabcdef.asp?%s HTTP/1.1" fullword ascii
        $x1 = "POST http://%s:%d/aspxabcdefg.asp?%s HTTP/1.1" fullword ascii
        $x2 = "greensky27.vicp.net" fullword ascii
        $x3 = "\\tempvxd.vxd.dll" fullword wide
        $x4 = "otna.vicp.net" fullword ascii
        $x5 = "smithking19.gicp.net" fullword ascii

        $s1 = "User-Agent: webclient" fullword ascii
        $s2 = "\\User.ini" fullword ascii
        $s3 = "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/200" ascii
        $s4 = "\\UserProfile.dll" fullword wide
        $s5 = "Connection:Keep-Alive: %d" fullword ascii
        $s6 = "Referer: http://%s:%d/" fullword ascii
        $s7 = "%s %s %s %d %d %d " fullword ascii
        $s8 = "%s--%s" fullword wide
        $s9 = "Run File Success!" fullword wide
        $s10 = "DRIVE_REMOTE" fullword wide
        $s11 = "ProxyEnable" fullword wide
        $s12 = "\\cmd.exe" fullword wide

    condition:
        uint16(0) == 0x5a4d and filesize < 1000KB and (1 of ($x*) or 7 of ($s*))
}