[Esd-l] Re: Suggested "Badtrans.B" recipe addition

John D. Hardin jhardin at impsec.org
Tue Nov 27 11:54:01 PST 2001

On Tue, 27 Nov 2001, Brett Glass wrote:

> It'd be useful to filter messages in which the RFC 822 From: address 
> contains the envelope "From" address preceded by an underscore. This is a 
> hallmark of nearly all messages sent by the worm. Not being a Procmail 
> maven, I don't know how to write this recipe, though. John?

You'd add something like:

  * ^From:.*<_

but a review of today's catch indicates that might not be a good idea.
I trapped one that had passed through a YahooGroups mailing list, and
the From: header had been de-underbarred. The Content-Type header had
also been cleaned up.

 John Hardin KA7OHZ    ICQ#15735746    http://www.impsec.org/~jhardin/
 jhardin at impsec.org                       pgpk -a jhardin at wolfenet.com
  768: 0x41EA94F5 - A3 0C 5B C2 EF 0D 2C E5  E9 BF C8 33 A7 A9 CE 76 
 1024: 0xB8732E79 - 2D8C 34F4 6411 F507 136C  AF76 D822 E6E6 B873 2E79
  In 1998 more than three times as many people in the US were killed
  by incompetent physicians than were killed by handguns, yet the
  President of the A.M.A. is adopting "gun safety" as his platform.
   1071 days until the Presidential Election

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