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Re: Board/user anomilies ( 22:03:10 MonMar 3 2003 ) |
Thought this info might help.I find it helpful at times..Hope it helps some JimJ How often you will detect scans depends upon your connection type and how long you are connected. cable-modems
Scanned/attacked several times per day. It depends upon the cable-modem segment you are on, but some people are getting attacked as much as 20 times per day. We believe scans are so common because hackers know that virtually all cable-modems are in the range 24.x.x.x. We suspect that those in the low range of 24.1.x.x receive more than those in higher ranges (i.e. 24.94.x.x). DSL modems
Varies widely, some are only about once per week, others receive a couple per day. We suspect that some DSL ranges are better known among hackers, and therefore get attacked more. Dial-up modemsThis varies widely, though you should see a scan against your system about once per month. It depends upon how often you are online, and what ISP you use. Since some hackers "camp" on IP addresses (waiting for people to dial-up), you are most likely to be scanned within a few minutes after you connect to the Internet. The traditional hacker technique is to post Trojan Horse programs on the Internet in newsgroups, on websites, or within e-mail spam. The hackers then run 'bots (robots) that scan huge portions of the Internet in order to see who has been infected with their programs.
Since any individual scanner is probing millions of potential victims, the likelihood is that the average user will get scanned every so often. However, most hackers want to compromise machines with fast, 24-hour connections like cable modems and DSL. Therefore, they target well-known address ranges, like 24.x.x.x, that support these high speed connections.
The most common TCP-based trojan horses detected by the intrusion-detection engine are listed below. TCP port Trojan horse name 555 Phase Zero 1243 Sub 7 6969 GateCrasher 12345 Netbus (default port) 21544 GirlFriend
, 23456 EvilFtp , 30100 NetSphere 54320 Back Orifice 2000 (default port)
Re: Board/user anomilies ( 05:31:45 TueMar 4 2003 ) |
Thanks for posting that info, DD.
Just so that people don't get the wrong idea about scans
- they in themselves are harmless - it's only if you have a Trojan on your computer that you have to worry, as a scan will detect its presence and then you're in trouble!
To protect yourself, do the following:
- If you haven't got one, purchase an anti-virus program - do it today!
- Either get the firewall accessory that's put out by your anti-virus program provider or get Zone Alarm (which is free for a personal, no frills version)
- Never open an email attachment unless you are 100% certain it's from someone you know and you are expecting it.
- Don't download freeware or shareware programs from the Net, unless you are 100% certain they are reputable - i.e. recommended by someone you trust
- Don't allow strangers (or the neighbor's kids) to play with your computer - some people have strange ideas about what is fun!
- If the website you've landed on looks at all suspicious, close the browser window immediately and run a virus check at once.
If you follow the above guidelines and exercise normal, sensible care, you should be safe enough. Be advised that Hotmail is vulnerable to hacking (and probably MSN too, as they come from the same stable). It's far safer really to use your ISP's email account facility. If you travel a lot, fair enough - Hotmail is great. However most ISP's allow you to have some form of redirect if you are going overseas and will be staying in one place.
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