Security companies have warned users of the vulnerability of a new worm to systems previously infected with the Sasser virus. The new worm has a backdoor functionality, which allows hackers to gain complete control of the system.
& nbsp;
The new "Dabber" has begun to attack and infect Microsoft's Windows operating system in the past two days, but the scale and damage caused by the worm remains small.
& nbsp;
Dabber is not the first worm to exploit the backdoor component left behind by worms. Also included are the Doomjuice and Deadhat worms, which attacked systems infected with the Mydoom virus.
& nbsp;
However, Dabber is the first worm to attack the system by exploiting a flaw in the previous virus program. In this case, the FTP server, which is set up by the Sasser worm, allows the worm to move files to new hosts containing a buffer overflow, and this is where the Dabber worm is exploited to attack the computer. The
& nbsp;
After Dabber infects a computer, it automatically changes its configuration so it can automatically run whenever the system starts up. Dabber will also lock other previously infected worms on the system.
& nbsp;
Finally, Dabber contains a backdoor component, which allows hackers to attack infected computers and take complete control of the system.
