Lain
I haven't run across this in the wild. Just wanted to let you know
that this isn't the first time I've seen more than just scripts coming
from the RIPE.NET domain out of Deutschland (Germany). I've seen it on at
least two incidents I've been on over the past six months.
Thanks,
Matthew Brown, CISSP, SSCP
Principal Security Consultant
Predictive Systems
"Iain Craig" <i.craigat_private>
06/05/2002 01:40 AM
To: <forensicsat_private>
cc: <incidentsat_private>
Subject: [incident] IIS defacement through FTP, possible DoS
Hi all,
Was wondering if anyone is aware of an IIS FTP server exploit that allows
an attacker the read/write access of a single given legimate user's
folders and also zeroes the log file?
I've just seen this behaviour on a box running Win2K Advanced Server SP2
and IIS 5.
The box hosts many websites, one of which was defaced; looking at the web
logs I see no suspicious activity at all (no POST attempts even - the
site's fairly simple and doesn't need POST at all - also no FrontPage).
Checking the FTP logs, which is the site's owner's only way in, I see the
log for when the attack happened (on hourly rotation) is precisely 64Kb of
00h.
Is this "just" a cunning FTP server exploit or, given the nature of the
logfile, should I be concerned that a higher level of access to the box
has been acheived?
In logs for the days prior to the compromise I see connections to the FTP
server that are certainly odd but don't match a brute force attack
fingerprint:
<snip>
02:08:50 81.65.186.118 anonymousat_private MSFTPSVC1 BOXNAME
IP.OF.THE.BOX 21 [27]USER anonymousat_private - 331 0 0 0 0 FTP -
- - -
02:08:50 81.65.186.118 anonymousat_private MSFTPSVC1 BOXNAME
IP.OF.THE.BOX 21 [28]USER anonymousat_private - 331 0 0 0 0 FTP -
- - -
02:08:50 81.65.186.118 anonymousat_private MSFTPSVC1 BOXNAME
IP.OF.THE.BOX 21 [29]USER anonymousat_private - 331 0 0 0 0 FTP -
- - -
02:08:50 81.65.186.118 anonymousat_private MSFTPSVC1 BOXNAME
IP.OF.THE.BOX 21 [30]USER anonymousat_private - 331 0 0 0 0 FTP -
- - -
02:08:50 81.65.186.118 - MSFTPSVC1 BOXNAME IP.OF.THE.BOX 21 [1]PASS - -
530 1326 0 0 235 FTP - - - -
02:08:50 81.65.186.118 - MSFTPSVC1 BOXNAME IP.OF.THE.BOX 21 [5]PASS - -
530 1326 0 0 219 FTP - - - -
02:08:50 81.65.186.118 - MSFTPSVC1 BOXNAME IP.OF.THE.BOX 21 [2]PASS - -
530 1326 0 0 219 FTP - - - -
<snip>
There was a LOT of those, all very fast like a DoS attempt. Other
usernames I was seeing in a similar DoS fashion from the same time and IP
were Ogpuserat_private, Kgpuserat_private, and Lgpuserat_private
Anyone know of a kiddie tool that uses these names?
Incidentally, from the WHOIS on that IP:
inetnum: 81.64.0.0 - 81.67.255.255
netname: FR-CYBERCABLE-20020103
descr: LYONNAISE COMMUNICATIONS
PROVIDER Local Registry
country: FR
admin-c: LC220-RIPE
tech-c: LC224-RIPE
status: ALLOCATED PA
mnt-by: RIPE-NCC-HM-MNT
mnt-lower: AS6678-MNT
mnt-routes: AS6678-MNT
changed: hostmasterat_private 20020103
changed: hostmasterat_private 20020108
source: RIPE
That's not the only IP these DoS-ish requests came from; going through the
others now. Wondering if I'm dealing with two seperate incidents here, the
defacement and a seperate DoS or DDoS.
Any advice or guidance appreciated.
Best regards,
Iain C
--
Iain Craig
--
Iain Craig - Systems Administrator
Gael.net Ltd - Web Developers & Internet Consultants
Telematic Centre,
Broom Place,
Dunvegan Road,
Portree,
Isle of Skye
Scotland
IV51 9HL
t: +44 (0)1478 613 300
f: +44 (0)1478 614 929
e: i.craigat_private
w: www.gael.net
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