Here is an info alert from TruSecure regarding the W32.Nimda.A@mm worm. This has some instructions on how to mitigate the worm, although no AV vendors have an update as of now. Trend Micro's site does not mention it yet. Although Symantec's [www.sarc.com] does have some info. McAfee's Avertlabs [www.avertlabs.com] calls it w32/minda@mm. Best Regards, Jaymes Williams, CISSP Security Analyst PG&E National Energy Group Gas Transmission Northwest 1400 SW Fifth Avenue, Suite 900 Portland, OR 97201 Voice: 503.833.4508 Fax: 503.833.4523 jaymes.williams@private PG&E National Energy Group and any other company referenced herein that uses the PG&E name or logo are not the same company as Pacific Gas and Electric Company, the regulated California utility. Neither PG&E National Energy Group nor these other referenced companies are regulated by the California Public Utilities Commission. Customers of Pacific Gas and Electric Company do not have to buy products from these companies in order to continue to receive quality regulated services from the utility. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 TruSecure ALERT- TSA 01-023 - W32.nimda.a.mm Date: September 18, 2001 Time: 1000 EDT RISK INDICES: Initial Assessment: RED HOT Threat: VERY HIGH, (rapidly increasing) Vulnerability Prevalence: VERY HIGH, effects IIS servers version 4.0, 5.0, and internal networks. Cost: High, command execution is possible Vulnerable Systems: IIS 4.0 and 5.0 SUMMARY: A new IIS worm is spreading rapidly. Its working name is Nimda: W32.nimda.a.mm It started about 9am eastern time today, Tuesday,September 18, 2001, Mulitple sensors world-wide run by TruSecure corporation are getting multiple hundred hits per hour. And began at 9:08am am. The worm seems to be targeting IIS 4 and 5 boxes and tests boxes for multiple vulnerabilities including: Almost all are get scripts, and a get msadc (cmd.exe) get_mem_bin vti_bin owssvr.dll Root.exe CMD.EXE ../ (Unicode) Getadmin.dll Default.IDA /Msoffice/ cltreq.asp This is not code red or a code red variant. The worm, like code red attempts to infect its local sub net first, then spreads beyond the local address space. It is spreading very rapidly. TruSecure believes that this worm will infect any IIS 4 and IIS 5 box with well known vulnerabilities. We believe that there are nearly 1Million such machines currently exposed to the Internet. Risks Indices: Vulnerability VULNERABILITY PREVALANCE is very high - Milllions of Internet Web server hosts: TruSecure process and essential configurations should generally be protective. The vulnerability prevalence world-wide is very high Threat - VERY HIGH and Growing The rate of growth and spread is exceedingly rapid - significantly faster than any worm to date and significantly faster than any variant of Code red. Cost -- Unknown, probably moderate per infected system. The worm itself is a file called README.EXE, or ADMIN.DLL a 56K file which is advertised as an audio xwave mime type file. Other RISKS: There is risk of DOS of network segments by traffic volume alone There is large risk of successful attack to both Internet exposed IIS boxes and to developer and Intranet boxes inside of corporations. Judging by the Code Red II experience, we expect many subtle routes of infection leading to inside corporate infections. We cannot discount the coincidence of the date and time of release, exactly one week to (probably to the minute) as the World Trade Center attack . REPLICATION: There are at least three mechanisms of spread: The worm seems to spread both by a direct IIS across Internet (IP spread) It probably also spreads by local shares. (this is not known for sure at this time) There is also an email vector where README.EXE is sent via email to numerous accounts. Mitigations TruSecure essential practices should work. Block all email with EXE attachments Filter for README.EXE Make sure IIS boxes are well patched and hardened, or removed from both the Internet and Intranets. Make sure any developer computing platforms are not running IIS of any version (many do so by default if either. Disconnect mail from the Internet Advise users not to double click on any unexpected attachments. Update anti-virus when your vendor has the signature. More Mitigations to follow, and additional information from TruSecure. DISCLAIMER: Copyright 2001 TruSecure Corporation. All rights reserved. This Alert is the property of the TruSecure Corporation. It may not be redistributed except within your own company or organization. This Alert is being provided for informational purposes only and is provided AS IS." The TruSecure Corporation makes no warranties of any kind, express or implied, including, but not limited to warranties of merchantability, fitness for a particular purpose, non-infringement, and warranties arising out of any course of dealing or course of conduct. Impenetrable security is unattainable in real world environments; the TruSecure Corporation cannot and does not guarantee protection against breaches of security. IN NO EVENT WILL THE TRUSECURE CORPORATION BE LIABLE FOR ANY BUSINESS INTERRUPTION, LOST REVENUE, PROFITS OR DATA, OR FOR DAMAGES OF ANY KIND, HOWEVER CAUSED, ARISING OUT OF YOUR USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN THIS WARNING, OR YOUR FAILURE TO RECEIVE ANY PRIOR OR FUTURE ALERTS, WATCHES OR WARNINGS, EVEN IF THE TRUSECURE CORPORATION HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. -----BEGIN PGP SIGNATURE----- Version: PGP 7.0.1 iQA/AwUBO6dhn0Nkp5EGviu0EQKC+ACgqNWUGzjEH71Zfidoj5wfK8o+EVoAnRFw ugG5gRQoGZ6uADCDyy/ogLsG =nGW1 -----END PGP SIGNATURE----- Jaymes Williams, CISSP Security Analyst PG&E National Energy Group Gas Transmission Northwest 1400 SW Fifth Avenue, Suite 900 Portland, OR 97201 Voice: 503.833.4508 Fax: 503.833.4523 jaymes.williams@private -----Original Message----- From: Adam Lipson [mailto:AdamL@private] Sent: Tuesday, September 18, 2001 9:16 AM To: Crime List Subject: Seeking Virus Info Our London office just encountered an unknown virus. If anyone has any idea what it might be can you please let me know. A scan of several major Anti-Virus vendors has not come up with any results. The description of what we have seen it do so far is listed below. Thanks for your help, Adam It will put sample.eml and desktop.eml on your desktop and in lots of folders on your hard drive. Then it will scan for IIS servers, and try to attach all machines on your local network running IIS. PG&E National Energy Group and any other company referenced herein that uses the PG&E name or logo are not the same company as Pacific Gas and Electric Company, the regulated California utility. Neither PG&E National Energy Group nor these other referenced companies are regulated by the California Public Utilities Commission. Customers of Pacific Gas and Electric Company do not have to buy products from these companies in order to continue to receive quality regulated services from the utility.
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