Welcome to the Virus Encyclopedia of Panda Security.
It has no destructive effects. It exploits the vulnerabilities belonging to the security bulletin MS05-051, in order to spread to as many computers as possible.
Dasher.A is a worm that installs a self-extracting RAR file on the affected computer. This file contains and installs other files, some of them belonging to malware, such as Exploit/MS05-051.A and Hacktool/TCPPortScan.A.
Dasher.A attempts to exploit the vulnerabilities referred to the Microsoft bulletin MS05-051. If exploited successfully, it allows hackers to gain remote control of the affected computer with the same privileges as the logged on user.
It is highly recommendable to download the security patch for the vulnerabilities belonging to the security bulletin MS05-051.
Dasher.A is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.
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