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SpamAssassin filters


agsteele

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I'm wondering if we can offer a SpamAssassin control to JT for an increasing amount of drug/pharmacy type spam that seems to be capable of slipping through the flat-rate Email account filtering.

About 60% of these items get caught by the SpamCop bl but the other third which would appear to originate from, as yet, unlisted IP addresses slips right on through.

An examply of such a message which reached my mailbox and was delivered (ie not trapped) is at http://www.spamcop.net/sc?id=z827575837z75...a657dda537a0fdz

The body content of the message reads as follows:

This is a multi-part message in MIME format.

------=_NextPart_000_0063_01C5EA0D.5FA43A80
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Good day,
Quit ov
g f
eddications - vis
armaEx
op
erpayin
or your M
it our Ph
press Sh
V L A X P V C
A e m a r I I
L v b n o A A
I i i a z G L
U t e x a R I
M ra n   c A S
1.21          3.33  3.75

The second part of the multi-part message is a repeat of this content in HTML code.

I have SpamAssassin set to trigger at a score of 2 - so already pretty aggressive. Seems that a chicken-pox check or similar has been circumvented.

I keep on reporting so those messages from listed IPs do, in time, get caught but it would be good if a content filter could catch these as well.

Andrew

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I have SpamAssassin set to trigger at a score of 2 - so already pretty aggressive.  Seems that a chicken-pox check or similar has been circumvented.

I keep on reporting so those messages from listed IPs do, in time, get caught but it would be good if a content filter could catch these as well.

36145[/snapback]

Just noting the obvious flip side here .... the construct offered wasn't an e-mail just tossed together in a second or two .... this is an obvious example of a spammer working hard at coming up with a spam that will "slip through the filters" .... and one can be sure that a number of filters was tested against ...

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Just noting the obvious flip side here .... the construct offered wasn't an e-mail just tossed together in a second or two .... this is an obvious example of a spammer working hard at coming up with a spam that will "slip through the filters" .... and one can be sure that a number of filters was tested against ...

36164[/snapback]

I totally agree :)

As an aside, does anybody actually respond to this type of advert? I'm not sure I can even work out what the following extract is supposed to mean ;)

Good day,

Quit ov

g f

eddications - vis

armaEx

op

erpayin

or your M

it our Ph

press Sh

Having read "Good day, Quit ov" I'd be totally bemused and hit delete - even if I wasn't tuned in to the spamming ways of these guys?

I do wonder what gain some of these guys get from the stuff they do to the content to get everything through.

Andrew

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As an aside, does anybody actually respond to this type of advert?  I'm not sure I can even work out what the following extract is supposed to mean  ;)

Good day,

Quit ov

g f

eddications - vis

armaEx

op

erpayin

or your M

it our Ph

press Sh

Having read "Good day, Quit ov" I'd be totally bemused and hit delete - even if I wasn't tuned in to the spamming ways of these guys?

I do wonder what gain some of these guys get from the stuff they do to the content to get everything through.

Andrew

36208[/snapback]

I wonder if the HTML version is using any positioning - the lines make (a little) more sense if rearranged in the order 1,2,7,3,8,4,9,5,10:

Good day,

Quit ov

erpayin

g f

or your M

eddications - vis

it our Ph

armaEx

press Sh

op

but anyone smart enough to figure that out is WAY to smart to follow up on it ( :unsure: I think ...)

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I'm not sure I can even work out what the following extract is supposed to mean  ;)

36208[/snapback]

I got a similar one:
This is a multi-part message in MIME format.

------=_NextPart_000_0046_01C5E8EB.9A15B680
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Quit over
ng for you
tions - vi
ineC
p
payi
r Meddica
sit our Medic
hest Sho
V L CI e IA v AG i LR t IA ra S 1,56  2,78  3,00

------=_NextPart_000_0046_01C5E8EB.9A15B680
Content-Type: text/html;
	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV> </DIV>
<TABLE style=3D"BORDER-RIGHT: 0px;" cellPadding=3D0 cellSpacing=3D0>
  <TR style=3D"BORDER-TOP: 0px;">
    <TD vAlign=3Dbottom style=3D"BORDER-TOP: 0px;" rowSpan=3D3>Quit =
over</TD><TD></TD>
    <TD vAlign=3Dbottom style=3D"BORDER-TOP: 0px;" rowSpan=3D3>ng for =
you</TD><TD></TD>
    <TD vAlign=3Dbottom style=3D"BORDER-TOP: 0px;" rowSpan=3D3>tions - <A =
href=3D"http://mchaippHeadvert.tripod.com">vi</A></TD><TD></TD>
    <TD vAlign=3Dbottom style=3D"BORDER-TOP: 0px;" rowSpan=3D3><A =
href=3D"http://mchaippHeadvert.tripod.com">ineC</A></TD><TD></TD>
    <TD vAlign=3Dbottom style=3D"BORDER-TOP: 0px;" rowSpan=3D3><A =
href=3D"http://mchaippHeadvert.tripod.com">p</A></TD><TD></TD>
  </TR>
  <TR style=3D"BORDER-TOP: 0px;">
    <TD style=3D"BORDER: 0px;" vAlign=3Dbottom>payi</TD>
    <TD style=3D"BORDER: 0px;" vAlign=3Dbottom>r Meddica</TD>
    <TD style=3D"BORDER: 0px;" vAlign=3Dbottom><A href=3D"http://mchaip=
pHeadvert.tripod.com">sit our Medic</A></TD>
    <TD style=3D"BORDER: 0px;" vAlign=3Dbottom><A href=3D"http://mch=
aippHeadvert.tripod.com">hest Sho</TD>
  </TR></TABLE>
<DIV> </DIV>
<TABLE>
<TR><TD><FONT face=3D"Courier" size=3D3>V L C</FONT></TD><TD><FONT =
face=3D"Courier" size=3D3>I e I</FONT></TD><TD><FONT face=3D"Courier" =
size=3D3>A v A</FONT></TD><TD><FONT face=3D"Courier" size=3D3>G i =
L</FONT></TD><TD><FONT face=3D"Courier" size=3D3>R t I</FONT></TD><TD><FONT =
face=3D"Courier" size=3D3>A ra S</FONT></TD><TD><FONT face=3D"Courier" =
size=3D3> 1,56  2,78  3,00</FONT></TD><TD width=3D100%></TD>=
</TR></TABLE></BODY></HTML>

------=_NextPart_000_0046_01C5E8EB.9A15B680--

which rendered as

Quit overpaying for your Meddications - visit our MedicineChest Shop

V I A G R A  1.56

L e v i t r a  2.78

C I A L I S  3.00

The URL's page was removed by Tripod:
The page you are attempting to access has been removed because it violated Tripod's Terms of Service. Please check out Tripod's Help system for more information.
The upshot is that the spammer was playing with tables in its HTML, which translated very poorly into text/plain.
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