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## F-Secure's C3 Client script
This is a simple [F-Secure's C3](https://github.com/FSecureLABS/C3) client Python script offering a few functions to interact with C3 framework in an automated manner.
It connects to the C3 WebController (typically the one that's listening on port _52935_) and allows to issue API requests automating few things for us.
### Usage:
The script offers subcommands-kind of CLI interface, so after every command one can issue `--help` to get subcommand's help message.
**General help**:
```
PS> py .\c3-client.py --help
:: F-Secure's C3 Client - a lightweight automated companion with C3 voyages
Mariusz B. / mgeeky, <mb@binary-offensive.com>
usage:
Usage: ./c3-client.py [options] <host> <command> [...]
positional arguments:
host C3 Web API host:port
{alarm,list,get,ping,connector,close,channel}
command help
alarm Alarm options
list List options
get Get options
ping Ping Relays
connector Connector options
close Close command.
channel Send Channel-specific command
optional arguments:
-h, --help show this help message and exit
-v, --verbose Display verbose output.
-d, --debug Display debug output.
-f {json,text}, --format {json,text}
Output format. Can be JSON or text (default).
-n, --dry-run Do not send any HTTP POST request that could introduce changes in C3 network.
-A user:pass, --httpauth user:pass
HTTP Basic Authentication (user:pass)
```
**Example of a sub-help**:
```
PS D:\> py c3-client.py http://192.168.0.200:52935 alarm relay --help
:: F-Secure's C3 Client - a lightweight automated companion with C3 voyages
Mariusz B. / mgeeky, <mb@binary-offensive.com>
usage: Usage: ./c3-client.py [options] <host> <command> [...] alarm relay [-h] [-e EXECUTE] [-x WEBHOOK] [-g gateway_id]
optional arguments:
-h, --help show this help message and exit
-e EXECUTE, --execute EXECUTE
If new Relay checks in - execute this command. Use following placeholders in your command: <computerName>, <userName>,
<domain>, <isElevated>, <osVersion>, <processId>, <relayName>, <relayId>, <buildId>, <timestamp> to customize executed
command's parameters. Example: powershell -c "Add-Type -AssemblyName System.Speech; $synth = New-Object -TypeName
System.Speech.Synthesis.SpeechSynthesizer; $synth.Speak('New Relay just checked-in
<domain>/<userName>@<computerName>')"
-x WEBHOOK, --webhook WEBHOOK
Trigger a Webhook (HTTP POST request) to this URL whenever a new Relay checks-in. The request will contain JSON message
with all the fields available, mentioned in --execute option.
-g gateway_id, --gateway-id gateway_id
ID (or Name) of the Gateway which Relays should be returned. If not given, will result all relays from all gateways.
```
Currently, following commands are supported:
- `list`
- `gateways` - list gateways in either JSON or text format
- `relays` - list relays in either JSON or text format
- `get`
- `gateway` - get gateway details in text or JSON format
- `relay` - get relay details in text or JSON format
- `alarm`
- `relay` - trigger an alarm whenever a new Relay checks-in on a gateway
- `connector`
- `turnon`
- `teamserver` - allows to establish connection with a Teamserver
- `turnoff` - closes connection with Connector specified by connector_id
- `close`
- `network` - sends `ClearNetwork` command to specified Gateway
- `channel` - closes selected channel
- `relay` - closes selected Relay(s) and all its bound peripherals, channels and Gateway-Return Channel
- `download`
- `gateway` - downloads gateway executable
- `ping` - ping selected Relays
- `channel` - channel-specific commands
- `all`
- `clear` - Clear message queue of every supported channel at once
- `mattermost`
- `create`- Creates a Mattermost Negotiation channel
- `clear` - Clear Mattermost's channel messages to improve bandwidth
- `ldap`
- `create` - Creates a LDAP Negotiation Channel
- `clear` - Clear LDAP attribute to improve bandwidth
- `mssql`
- `create` - Creates a MSSQL Negotiation Channel
- `clear` - Clear DB Table entries to improve bandwidth
- `uncsharefile`
- `clear` - Remove all message files to improve bandwidth
- `dropbox`
- `clear` - Remove All Files to improve bandwidth
- `github`
- `clear` - Remove All Files to improve bandwidth
- `googledrive`
- `clear` - Remove All Files to improve bandwidth
- `spawn` - adds peripheral / spawns implant on Relay
- `beacon` - Adds peripheral Beacon or in other words spawns new Beacon on Relay
### Example Usage
**Example 1**
This example shows how to keep all of your Relays pinged every 45 seconds:
```
PS D:\> py c3-client.py http://192.168.0.200:52935 ping -k 45
:: F-Secure's C3 Client - a lightweight automated companion with C3 voyages
Mariusz B. / mgeeky, <mb@binary-offensive.com>
[.] Sending a ping every 45 seconds.
[.] Pinged relay: matter4 from gateway gate4
[.] Pinged relay: mssql1 from gateway gate4
[.] Pinged relay: ldap9 from gateway gate4
[.] Pinged relay: mssql1 from gateway gate4
[+] Pinged 4 active relays.
[.] Sending a ping every 45 seconds.
[.] Pinged relay: matter4 from gateway gate4
[.] Pinged relay: mssql1 from gateway gate4
[.] Pinged relay: ldap9 from gateway gate4
[.] Pinged relay: mssql1 from gateway gate4
[+] Pinged 4 active relays.
```
**Example 2**
Ever suffered from a poor C3 bandwidth or general performance? Worry not - you can easily clear/remove message queues from all of your channels with this simple trick:
```
PS D:\> py .\c3-client.py http://192.168.0.200:52935 channel all clear
:: C3 Client - a lightweight automated companion with C3 voyages
Mariusz B. / mgeeky, <mb@binary-offensive.com>
[.] LDAP: Clearing messages queue...
[+] Cleared LDAP attribute value on C3 channel 3 on Relay matter4 on gateway gate4
[+] Cleared LDAP attribute value on C3 channel 8001 on Relay matter4 on gateway gate4
[+] Cleared LDAP attribute value on C3 channel 8000 on Relay ldap9 on gateway gate4
[.] MSSQL: Clearing messages queue...
[+] Cleared MSSQL Table on C3 channel 4 on Relay matter4 on gateway gate4
[+] Cleared MSSQL Table on C3 channel 8002 on Relay matter4 on gateway gate4
[+] Cleared MSSQL Table on C3 channel 8003 on Relay matter4 on gateway gate4
[+] Cleared MSSQL Table on C3 channel 8000 on Relay mssql1 on gateway gate4
[+] Cleared MSSQL Table on C3 channel 8000 on Relay mssql1 on gateway gate4
[.] Mattermost: Clearing messages queue...
[+] Purged all messages from Mattermost C3 channel 8000 on Relay matter4 on gateway gate4
[+] Purged all messages from Mattermost C3 channel 8000 on Relay matter4 on gateway gate4
[+] Purged all messages from Mattermost C3 channel 1 on gateway gate4
[+] Purged all messages from Mattermost C3 channel 4 on gateway gate4
[+] Purged all messages from Mattermost C3 channel 14 on gateway gate4
[.] GoogleDrive: Clearing messages queue...
[-] No channels could be found to receive GoogleDrive remove all message files command.
[.] Github: Clearing messages queue...
[-] No channels could be found to receive Github remove all message files command.
[.] Dropbox: Clearing messages queue...
[-] No channels could be found to receive Dropbox remove all message files command.
[.] UncShareFile: Clearing messages queue...
[-] No channels could be found to receive UncShareFile remove all message files command.
```
**Example 3**
In this example setup an alarm that triggers upon new Relay checking-in. Whenever that happens, a command is executed with placeholders that will be substituted with values extracted from Relay's metadata:
```
PS D:\> py c3-client.py http://192.168.0.200:52935 alarm relay -g gate4 --execute "powershell -file speak.ps1 -message \`"New C3 Relay Inbound: <domain>/<userName>, computer: <computerName>\`""
:: F-Secure's C3 Client - a lightweight automated companion with C3 voyages
Mariusz B. / mgeeky, <mb@binary-offensive.com>
[.] Entering infinite-loop awaiting for new Relays...
[+] New Relay checked-in!
Relay 5: matter4
Relay ID: 70a6f7c456f049c8
Build ID: 795f
Is active: True (+)
Timestamp: 2021-03-24 04:14:34
Host Info:
Computer: JUMPBOX
Domain: CONTOSO
User Name: alice
Is elevated: False
OS Version: Windows 10.0 Server SP: 0.0 Build 14393
Process ID: 4092
Channels:
Gateway Return Channel (GRC) 1:
Jitter: 3.5 ... 6.5
Properties:
Name: Output ID
Value: 3UM2G2TW
Name: Input ID
Value: fftuO5py
Name: Mattermost Server URL
Value: http://192.168.0.210:8080
Name: Mattermost Team Name
Value: foobar
Name: Mattermost Access Token
Value: c3g7sokucbgidgxxxxxxxxxx
Name: Channel name
Value: x26vg0
Name: User-Agent Header
Value: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)
[.] Executing command: powershell -file speak.ps1 -message "New C3 Relay Inbound: CONTOSO/alice, computer: JUMPBOX"
```
### Author
```
Mariusz B. / mgeeky, '21
<mb [at] binary-offensive.com>
```
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