RE: New Trojan
From: David LeBlanc (dleblanc_at_Exchange.Microsoft.com)
Date: 10/29/03
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Date: Tue, 28 Oct 2003 18:51:10 -0800 To: "Brian Eckman" <eckman@umn.edu>, "Damian Gerow" <damian@sentex.net>
-----Original Message-----
From: Brian Eckman [mailto:eckman@umn.edu]
Sent: Monday, October 27, 2003 1:31 PM
To: Damian Gerow
Cc: incidents@securityfocus.com
Subject: Re: New Trojan
> AFAIK, there is *no* method of removal for this trojan, [snip]
It can be "removed" by renaming all instances of rundll32.exe at once,
so System File Protection won't replace it again. [snip]
----------------------------
Something else to add to your bag of tricks is that WFP won't tamper
with ACLs. So instead of trying to remove or rename executables, re-ACL
them to read, no execute. This can be done remotely without logging in,
assuming you have admin privileges.
This won't help in all cases, but can sometimes be useful. Likewise, if
something insists on putting registry keys back again, take away your
own permission to write to the parent key temporarily (leaving yourself
delete permission), then nuke it. It might even kill the thing by
causing it to take unexpected code paths...
IMHO, a clean reformat and reinstall is always the best way to get rid
of a Trojan, but these techniques might help in some situations.
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- Previous message: Bassett, Mark: "Large increase in port 27347"
- Maybe in reply to: Jay Castaldo: "New Trojan"
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