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Denial of service (DoS) attack Trojans

These Trojans give the attacker the power to start a distributed denial of service (DDoS) attack if there are enough victims.

The main idea is that if you have 200 infected ADSL users and you attack the victim simultaneously from each,

this will generate HEAVY traffic (more than the victim's bandwidth can carry, in most cases), causing its access to the Internet to shut down.

WinTrinoo is a DDoS tool that has recently become very popular; through it,

An attacker who has infected many ADSL users can cause major Internet sites to shut down;

Early examples of this date back to February 2000, when a number of prominent e-commerce sites such as Amazon, CNN, E*Trade, Yahoo and eBay were attacked.

Another variation of a DoS Trojan is the mail-bomb Trojan,

where the main aim is to infect as many machines as possible and simultaneously attack specific email address/addresses with random subjects and contents that cannot be filtered.

Again, a DoS Trojan is similar to a virus, but the DoS Trojan can be created purposely to attack you, and therefore is unlikely to be detected by your anti-virus software.

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