A Trojan is a malicious file that disguises itself to infect your system.

	WEEKLY REPORTS Solutions, Prevention & Remedies Top 10 Threats

Trojans often search for your financial or personal information; but this new one is hiding out on computers, hoping to catch and chastise visitors to adult Web Sites.

Yusufali.A, a Trojan horse with an apparent moral mission, monitors surfing habits. When it detects disagreeable terms such as "sex" or "exhibitionism" in your browser's title bar, it bans the site from being visible. Instead, users receive an excerpt from the Koran that reads, in part, "Allah knows how ye move about and how ye dwell in your homes."

If they continue to try and view the site, Yusufali will cause the user's computer to log out and will send a message reading, "Oh! NO i'm in the Cage."

Other than the reprimands, the Yusufali Trojan does not appear to do the usual damage like stealing personal or financial information. The Trjoan only affects Windows operating systems, and is downloaded onto the PC when the user clicks on an infected email attachment.

Information, Protection and Prevention -- Yusufali.A
• Sophos definition

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* Reading: Solutions, Prevention & Remedies
Additional summary information related to a specific type of solution or prevention that you should be considering. Depending upon the week, this section may have:
• Recent Windows security releases from Microsoft
• Recent updates to widely used anti-spyware programs
• Recent updates to widely used anti-virus programs
• Recent updates to other security programs & devices (ex: Firewalls, routers)
• Recent updates to various applications in wide use

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Read: Top Threats
These are viruses that are currently on the watch lists of major anti-virus software companies.

Name
What the threat is called. We use the name given each virus by Panda Software. Sometimes other anti-virus companies give the same threat a different name. Usually they use similar names.

Type
There are different characteristics associated with different types of threats.
• Virus - has the ability to replicate or infect computers or other programs
• Trojan Horse (or Trojan) - appear to be harmless programs when you get them. They unleash their payload when you double-click, open, or execute them.
• Phishing - a Web site or e-maill message posing as another company - usually one you know to fool you into giving the sender personal information.
• Worm - self replicates onto additional disks, computers or networks
• Spyware - installs on your system to collect information about your activity, preferences or interests
• Hoax - false messages sent by e-maill to mislead the recipient
• Backdoors - opens a security hole that allows outsiders to take control of your computer
• Dialer - uses your telephone to dial an outside number - sometimes a number that costs you money when dialed

Affects
Not all viruses affect all types of systems. Some, for example may affect only Windows 98 and 95, but not Windows XP or NT. Others affect all Windows systems, but not Macintosh. In this column, we show you the consumer systems that the threat is known to affect. We don't always include the servers that operate in your company's backroom.

Alert level
The level of awareness that anti-virus vendors suggest you need to have for each threat listed.
For each threat listed, we'll post a corresponding link here, so you can get more information to help you recognize, diagnose, prevent, and repair the problem.

Worry Watch is compiled by David Radin & Jes Scherder using data and reports from Microsoft, CERT, Panda, and other sources. To contact the compilers of Worry Watch, go to http://www.megabyteminute.com/contactdavid.html