HLSniper

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Forms of abuse

Like any network open to the public, people with malicious intent can often be found on IRC networks. These people commonly utilize the following tactics:

Denial of service attacks and netsplit abuses, described above. Responding to requests for help with potentially harmful instructions, such as:

Ctrl+Alt+Delete twice (forces a reboot in earlier versions of Windows)
Alt+F4 (closes current program in Windows)
Ctrl+F4 (closes current active window in mIRC)
Alt+Z (closes the current channel window in mIRC)

Attempting to trick users into typing commands that will cause them to quit the server. For example: "/quit and /part are sitting on a boat, /part jumps into the water first. Who's left?" Impersonating service bots to trick users into revealing their password. For example: "Your account needs to be identified. Type /msg ChanServ` identify to confirm your identity." Advertising channels that end in ",0" (such as #chat,0). A single JOIN request can join multiple channels separated by commas, and joining channel 0 will cause a user to part all channels. Taking advantage of some IRC clients' scripting features to hide malicious commands, most notably the mIRC $decode() function. (However this has been locked in later versions.)

Content from wikipedia.org