full-disclosure - SPAM with a PGP signature?

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From: Valdis.Kletnieks at vt.edu (Valdis.Kletnieks@...edu)
Subject: SPAM with a PGP signature? 

On Mon, 21 Jul 2003 13:54:11 EDT, KF <dotslash@...soft.com>  said:
> Has anyone noticed alot of spam coming in recently with pgp sigs 
> attached? What would be the benefit of doing that?

Bypassing spam filters that think that anything that's got a 'BEGIN PGP SIGNATURE'
line is non-spam.  Note that most filters just do a regexp and don't bother
checking if it's a *valid* signature...

> <font color=3D"#FFFFFF">
> -----BEGIN PGP SIGNATURE-----
> version: pgpfreeware 6.5.2 for non-commercial use <http://www.pgp.com>
> 
> ksie8fg4j8r7m3s9od5h2ixrqheaqqa3ysepsq0xzdhzuvskfdktfpe9xs4fhqs
> wacj49dk6u883sxo4kb9u6/jnjdx6cjqnzxpetxk9b2dogll/c/60hwrpn+vujdu
> xav65sop+px4knaqcciecamqj7ugcsw+cqmpnbxwyatymjafkbkh1eulc2vrwdmd
> cjdi57fh43ks9cm78h4t
> -----END PGP SIGNATURE-----
> </font>

For bonus points, note the lack of a '--- BEGIN PGP SIGNED MESSAGE',
or other indication of exactly what data is covered by the signature.  Our
spammer is certainly not following RFC3156 ;)

Oh, and it doesn't even look like a valid signature:

% gpg  --list-packets foo.sig
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: invalid radix64 character 2d skipped
gpg: onepass_sig with unknown version 56
gpg: no valid OpenPGP data found.

If anybody is surprised by *that*, they've probably just fallen out
of a tree.... ;)
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