Security Incidents mailing list archives
Re: Compromised Windows Server
From: Macleonard Starkey <macleonard () auscert org au>
Date: Wed, 07 Jun 2006 12:19:25 +1000
Hi Patrick
Came in this morning to find a windows 2003 server I manage scanning the Internet for machines listening on tcp 139 and 445. While looking at the machine I noticed the following processes running.
Sounds like you were able to capture some of the network traffic. Got any packet dumps, netflows or the like?
I believe that the ponoas.exe is some sort of rootkit although searching on google for this file name returns nothing. Also searching mwvsta.exereturns nothing. At this point I have removed these files from the system and registry but am weary that the server will get hit again. Has anyone had an experience with the following file or have any idea what rookkit of virus they are associated with?
As other people have mentioned, file names a terribly unreliable way of identifying malware. If you still have copies of the malware, run them through virustotal (www.virustotal.com), this runs the files past a number of AV scanners to see what they detect it as. I'd also poke the malware to see how it wiggles. You should be wary of the server being re-compromised. Especially if you have not identified and corrected the vulnerability that was used to compromise the server in the first place. There's a number of things that I would recommend here - besides a complete rebuild, which btw I normally recommend after any compromise: 1. Get a pen and piece of paper and start writing. :) 2. Run the MBSA tool (Microsoft Baseline Security Analyser) over the server, this is good for a quick overview of missing patches for MS products, record the results. If the host is a web server, check for updates to php or whatever you happen to be running there, record the results. For the record, you should do this for every application which is reachable via the network on this host, and if users browse the web from this server, every application period. Record the results. 3. Run the MSRT (Malicious Software Removal Tool) over the affected host and record the results. 4. Crank up any monitoring you do of traffic to/from this server to 11 for a period which best reflects the requirements of your incident response policy. 5. Write a report on your findings, and update your security/ response procedures accordingly. If you don't have these procedures, then now is a good time to get them. Nothing like a good compromise to get management backing for this :). 5. If pain persists, contact the MSRC and your local CERT team. AusCERT have a good document on responding to a compromise of a Windows here: http://www.auscert.org.au/4323 The MSRT, and MBSA are all available free from Microsoft. Hope that helps, MacLeonard -- MacLeonard Starkey, Security Analyst | Hotline: +61 7 3365 4417 AusCERT | Fax: +61 7 3365 7031 The University of Queensland | WWW: www.auscert.org.au QLD 4072 Australia | Email: auscert () auscert org au ------------------------------------------------------------------------------ This List Sponsored by: Black Hat Attend the Black Hat Briefings & Training USA, July 29. August 3 in Las Vegas. World renowned security experts reveal tomorrow.s threats today. Free of vendor pitches, the Briefings are designed to be pragmatic regardless of your security environment. Featuring 36 hands-on training courses and 10 conference tracks, networking opportunities with over 2,500 delegates from 40+ nations. http://www.blackhat.com ------------------------------------------------------------------------------
Current thread:
- Compromised Windows Server Patrick Beam (Jun 05)
- Re: Compromised Windows Server Jamie Riden (Jun 05)
- Re: Compromised Windows Server pauls (Jun 05)
- Re: Compromised Windows Server Jason Ross (Jun 05)
- Re: Compromised Windows Server Axel Pettinger (Jun 06)
- Re: Compromised Windows Server Harlan Carvey (Jun 06)
- Re: Compromised Windows Server Patrick Beam (Jun 06)
- Re: Compromised Windows Server Kees Leune (Jun 07)
- Re: Compromised Windows Server Isaac Perez (Jun 06)
- Re: Compromised Windows Server Macleonard Starkey (Jun 06)
- <Possible follow-ups>
- Re: Re: Compromised Windows Server wnorth (Jun 05)
- Re: Compromised Windows Server Butterworth, Jim (Jun 06)
- Re: Compromised Windows Server ross (Jun 06)
- RE: Compromised Windows Server Alan Davies (Jun 08)
- Re: Compromised Windows Server df (Jun 08)