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A U S C E R T A L E R T
AL-2000.03 -- AUSCERT ALERT
Current Widespread Intruder Activity
02 March 2000
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PROBLEM:
AusCERT has received numerous reports of root compromises within
Australia which have a common intruder signature.
As these recent compromises are widespread and moderately easy
to detect, AusCERT is releasing information on this intruder's
"signature" to enable System Administrators to detect if their
systems have been compromised by this intruder.
While it is easily possible for the intruder(s) to change their
modus operandi we still believe this information will be
beneficial to some sites in the interim.
PLATFORM:
So far only Unix based platforms have been affected using known
vulnerabilities.
IMPACT:
Unix systems are being root compromised and used to scan/probe
other networks. Password sniffers have also been reported as
being installed to gather other account information.
RECOMMENDATIONS:
System Administrators are urged to check their systems for
processes like "./k -o com.au" and "./scan -s". User accounts
named "hc" and "hantu" are typically installed with home
directories in /home/hu and /home/hantu. Various files are
stored in the home directories and in other locations such
as /dev.
Some files to look for on your system are:
.s, /tmp/h, bj.c, /usr/bin/old, com.log, net.log,
/dev/.imapshit
The intruder typically installs a trojaned /bin/login.
Also the intruder typically does not clean up after a compromise
so the intrusions are relatively easy to detect.
If you suspect that your site may have been compromised, we
recommend you read:
http://www.cert.org/tech_tips/intruder_detection_checklist.html
If your site has been compromised, we recommend you read:
http://www.cert.org/tech_tips/root_compromise.html
AusCERT is currently monitoring this problem, if you detect your
systems have been compromised please contact AusCERT. We are
currently tracking this incident as AUSCERT#97913. We would
appreciate you using this tracking code in the subject of any
email you send regarding this incident.
In addition, we are interested in eliciting your feedback
regarding this type of alert. We realise that intrusions are
commonplace and that there is not a great deal of new technical
detail in this alert because it needed to be released in a timely
manner. We would appreciate it if you could let us know whether
this type of alert (that is, current activity with some
information regarding modus operandi) is something you would
like us to continue to report.
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[AusCERT issues an alert when the risk posed by a vulnerability that may
not have been thoroughly investigated and for which a work-around or fix
may not yet have been developed requires notification.]
The AusCERT team has made every effort to ensure that the information
contained in this document is accurate at the time of publication. However,
the decision to use the information described is the responsibility of
each user or organisation. The appropriateness of this document for an
organisation or individual system should be considered before application
in conjunction with local policies and procedures. AusCERT takes no
responsibility for the consequences of applying the contents of this
document.
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
AusCERT maintains an anonymous FTP service which is found on:
ftp://ftp.auscert.org.au/pub/. This archive contains past SERT
and AusCERT Advisories, and other computer security information.
AusCERT maintains a World Wide Web service which is found on:
http://www.auscert.org.au/.
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business
hours which are GMT+10:00 (AEST). On call
after hours for emergencies.
Postal:
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
AUSTRALIA
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Credits
-- UnKnown --
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