full-disclosure - smarter dcom worm

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From: gml at phrick.net (gml)
Subject: smarter dcom worm

I agree with Justin.  You would think that by now someone would write a
random address generator that would solve the obvious timing problems that
Most worms seem to suffer from.  I was thinking more along the lines of
Generating a random IP but on the first 3 octets and going through the
Entire class C.  Also, why did this worm carry around a dummy tftp server?
NetBIOS is available as a transport method natively in the target OS.
Don't get me wrong NetBIOS isn't the most reliable of network file systems
But it is certainly more lightweight to use this approach than an embedded
tftp server.  I think it also solves that whole filtering "problem" to an
extent.  I am also not trying to encourage, this worm was a serious pain for
me this week as I imagine it was for a lot of people.

-----Original Message-----
From: full-disclosure-admin@...ts.netsys.com
[mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of Justin Shin
Sent: Tuesday, August 12, 2003 6:32 PM
To: Full-Disclosure@...ts.Netsys.Com
Subject: [Full-Disclosure] smarter dcom worm

As many people have said, this worm sucks. First of all, look at the host
discovery mechanism. Random IP's are sooooo outdated. A better idea? Start
with:

1. Subnet (192.168.x.x)
2. WAN Address [for nat's] (24.31.34.x)
3. Incremental WAN (24.31.x.x)

Obviously not a new idea but also not a bad one. I am sure that your average
college-level math professor could simplify the host discovery process.

tftp: slow, old, but easy to use. probably straight up ftp would be a better
dropping protocol, no?

registry/run is the oldest known startup method. try actually using MULTIPLE
startups, like Registry RunServices, RunOnce, RunServicesOnce, AUTOEXEC.BAT,
SYSTEM.INI, WIN.INI, WINSTART.BAT, WINITIT.INI, CONFIG.SYS ... etc.

once installed, the program should spawn copies of itself, using startup
methods, hidden files, fake system exes, etc. it should block out filenames
of patches, windowsupdate stuff, fixes, to stop newbies from fixing it.

the worm should also have a more interesting payload -- such as lookin at
inetpub and htdocs, etc.

note -- im not trying to encourage this stuff, i am just pointing out some
key flaws in this worm. the next one may have all of these features and much
more, because I am not a very creative guy.

-- Justin

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