directory
1. FTP Trojan
2. Communication software
(1) Sending message type
(2) Hacking type
(3) Spreading its own type
3. Web page click type
1. FTP Trojan
FTP type Trojan opening is controlled The computer’s port 21 (the default port used by FTP) allows everyone to use an FTP client program to connect to the controlled computer without a password, and upload and download with the highest authority to steal the victim’s secret document. The new FTP Trojan also adds a password function, so that only the attacker knows the correct password and can access the other party's computer.
2. Communication software
There are generally three common instant messaging Trojans:
(1) Sending messages
automatically sends messages containing malicious URLs through instant messaging software. The purpose is to make the user who received the message click the URL to be poisoned. After being poisoned, users will send virus messages to more friends. A common technique for this type of virus is to search the chat window, and then control the window to automatically send text content. Message-sending Trojans often serve as advertisements for online game Trojans. For example, the "Wuhan Boys 2005" Trojan can send poisonous URLs through various chat software such as MSN, QQ, UC, etc. Its main function is to steal the account and password of the legendary game
( 2) The main goal of hacking
is the login account and password of instant messaging software. The working principle is similar to that of online game Trojans. After the virus author steals the account of another person, he may peep into private content such as chat history, send bad information, advertising and other statements to friends in various communication software, or sell the account to make a profit. [3]
(3) Spreading its own type
In early 2005, after a period of worms spreading through MSN such as "MSN Sexy Chicken", MSN released a new version that prohibited users from sending executable files. In the first half of 2005, the two domestic viruses, "QQ Turtle" and "QQ Love Worm", spread themselves through the QQ chat software, and infected a large number of users. The top ten viruses in the first half of 2005 ranked by Jiangmin Company. Ranked first and fourth on the list. From a technical perspective, the file-sending QQ worm is an evolution of the previous message-sending QQ Trojan. The basic technology used is to control the chat window after searching for the chat window to achieve the purpose of sending files or messages. But the operation of sending a file is much more complicated than sending a message.
3. Web page click type
Web page click type Trojan will maliciously simulate actions such as users clicking on advertisements, and can generate tens of thousands of clicks in a short time. Virus authors generally write for the purpose of earning high advertising costs. The technology of this type of virus is simple, generally just sending an HTTP GET request to the server.
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