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There have been numerous reports of IIS attacks being generated by
machines over a broad range of IP addresses. These "infected"
machines are using a wide variety of attacks which attempt to exploit
already known and patched vulnerabilities against IIS.

It appears that the attacks can come both from email and from the
network.

A new worm, being called w32.nimda.amm, is being sent around. The
attachment is called README.EXE and comes as a MIME-type of
"audio/x-wav" together with some html parts. There appears to be no
text in this message when it is displayed by Outlook when in
Auto-Preview mode (always a good indication there's something not
quite right with an email.)

The network attacks against IIS boxes are a wide variety of attacks.
Amongst them appear to be several attacks that assume the machine is
compromised by Code Red II (looking for ROOT.EXE in the /scripts and
/msadc directory, as well as an attempt to use the /c and /d virtual
roots to get to CMD.EXE). Further, it attempts to exploit numerous
other known IIS vulnerabilities.

One thing to note is the attempt to execute TFTP.EXE to download a
file called ADMIN.DLL from (presumably) some previously compromised
box.

Anyone who discovers a compromised machine (a machine with ADMIN.DLL
in the /scripts directory), please forward me a copy of that .dll
ASAP.

Also, look for TFTP traffic (UDP69). As a safeguard, consider doing
the following;

edit %systemroot/system32/drivers/etc/services.

change the line;

tftp 69/udp

to;

tftp 0/udp

thereby disabling the TFTP client. W2K has TFTP.EXE protected by
Windows File Protection so can't be removed.

More information as it arises.

Cheers,
Russ - Surgeon General of TruSecure Corporation/NTBugtraq Editor

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