Remote Control and
Remote Control Software
What do they do?
Connect through dial-in and/or TCP/IP.
Replicate remote screen on local machine (graphical)
Allow running graphical, text-based application in remote machine,
displaying the results in the local machine.
A variety of applications, most with free download as demo.
pcAnywhere is one of the pioneers and very popular.
VNC is also very popular because it is cross-platform and free.
Discovering and connecting to remote control software
Use Nmap or Superscan to search for ports 22, 799, 800, 1494, 2000,
2001, 5631, 5632, 5800, 5801, 5900, 5901, 43188, 65301
Once software is identified download free demo and try brute force.
Major weakness: only password is encrypted, traffic is compressed,
Countermeasures: strong password (again), encrypt traffic (SSL, SSN,
etc.), limit and log login attempts, change default listening port. In dial-in
use: logoff user with call completion.
Adding to what we have seen before:
Trojans: we have seen that BO, NetBus and SubSeven are the most
common Trojan, backdoor hacker tools.
TCP/IP ports: official , Internet services. Different from protocol
Trojan ports: list , more details, and resources.
Port listening software: netstat, Active Ports (example), BackOfficer
Checking and removing Trojans: Symantec on-line check
(example), Moosoft Cleaner shareware.
Weeding out rogue processes: Windows Task Manager, Linux ps –
Be aware of traps: Whack-A-Mole (pseudo game), BoSniffer (BO in
disguise), eLiTeWrap (packs Trojans as exe). Generic: download,
scan for virus, then execute, do not run from Internet.
Rootkits: Difficult to detect
keep a record of your files using Tripwire,
create image of your hard-drive: hardware and software solutions
(Norton Ghost, Drive Image).
Juggernaut: spy on a TCP connection and issue commands as the
Hunt: spy on a TCP connection (works with shared and switched
Countermeasures: encrypted protocols such as IPSec, SSH.
TFTP: Trivial File Transfer Protocol.
Used by routers, and there are free servers for Windows.
Standard client in Windows 2000: tftp.exe protected by Windows File
Protection so it can't be removed. See use here.
Prevent its use by Nimda :
1) Edit the services file:
2) Find this line: tftp 69/udp
3) Replace it with: tftp 0/udp
Help desk information: on the Web, e-mail, voice
User information: on the Web, e-mail, voice