Re: [Asrg] An Anti-Spam Heuristic
Chris Lewis <clewis+ietf@mustelids.ca> Fri, 14 December 2012 04:39 UTC
Return-Path: <clewis+ietf@mustelids.ca>
X-Original-To: asrg@ietfa.amsl.com
Delivered-To: asrg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9EBB021F8C0B for <asrg@ietfa.amsl.com>; Thu, 13 Dec 2012 20:39:25 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 0.229
X-Spam-Level:
X-Spam-Status: No, score=0.229 tagged_above=-999 required=5 tests=[AWL=-0.582, BAYES_20=-0.74, FH_RELAY_NODNS=1.451, RDNS_NONE=0.1]
Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Dr2Ef5Tgpfsp for <asrg@ietfa.amsl.com>; Thu, 13 Dec 2012 20:39:25 -0800 (PST)
Received: from mail.mustelids.ca (unknown [174.35.130.2]) by ietfa.amsl.com (Postfix) with ESMTP id 0FA2121F8C04 for <asrg@irtf.org>; Thu, 13 Dec 2012 20:39:24 -0800 (PST)
Received: from [192.168.0.8] (otter.mustelids.ca [192.168.0.8]) (authenticated bits=0) by mail.mustelids.ca (8.14.4/8.14.4/Debian-2ubuntu2) with ESMTP id qBE4dLsw015680 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NOT) for <asrg@irtf.org>; Thu, 13 Dec 2012 23:39:22 -0500
Message-ID: <50CAAD79.8040008@mustelids.ca>
Date: Thu, 13 Dec 2012 23:39:21 -0500
From: Chris Lewis <clewis+ietf@mustelids.ca>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Mnenhy/0.7.6.666
MIME-Version: 1.0
To: asrg@irtf.org
References: <SNT002-W143FB9A867C92FA80D90E04C54E0@phx.gbl> <DA14FA4D-13CB-4C61-90C4-4E690F0EC745@blighty.com> <SNT002-W1393526B62C0940EF697B2C54E0@phx.gbl> <20682.3413.665708.640636@world.std.com> <50CA0E91.2080304@mtcc.com> <20682.23612.451287.246798@world.std.com> <E26A6D4F-FC05-45B9-80F0-9E6F8A6A9713@blighty.com> <20682.31889.485606.165715@world.std.com>
In-Reply-To: <20682.31889.485606.165715@world.std.com>
X-Enigmail-Version: 1.4.6
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Subject: Re: [Asrg] An Anti-Spam Heuristic
X-BeenThere: asrg@irtf.org
X-Mailman-Version: 2.1.12
Precedence: list
Reply-To: Anti-Spam Research Group - IRTF <asrg@irtf.org>
List-Id: Anti-Spam Research Group - IRTF <asrg.irtf.org>
List-Unsubscribe: <http://www.irtf.org/mailman/options/asrg>, <mailto:asrg-request@irtf.org?subject=unsubscribe>
List-Archive: <http://www.irtf.org/mail-archive/web/asrg>
List-Post: <mailto:asrg@irtf.org>
List-Help: <mailto:asrg-request@irtf.org?subject=help>
List-Subscribe: <http://www.irtf.org/mailman/listinfo/asrg>, <mailto:asrg-request@irtf.org?subject=subscribe>
X-List-Received-Date: Fri, 14 Dec 2012 04:39:25 -0000
Ooh, quantitative ;-) For grins, I took one of my smaller spamtraps and applied a 30 second banner delay. I wanted to quantify "And a lot of spamware doesn't flunk." In the timestamps below, the change happened at 04:52. Flow per minute: 156 2012/12/14-04:39 205 2012/12/14-04:40 189 2012/12/14-04:41 188 2012/12/14-04:42 167 2012/12/14-04:43 165 2012/12/14-04:44 181 2012/12/14-04:45 138 2012/12/14-04:46 185 2012/12/14-04:47 173 2012/12/14-04:48 152 2012/12/14-04:49 113 2012/12/14-04:50 156 2012/12/14-04:51 30 2012/12/14-04:52 46 2012/12/14-04:53 46 2012/12/14-04:54 63 2012/12/14-04:55 46 2012/12/14-04:56 55 2012/12/14-04:57 41 2012/12/14-04:58 51 2012/12/14-04:59 41 2012/12/14-05:00 30 2012/12/14-05:01 A 3:1 spam reduction is nothing to sneeze at. Not only that, but I can tell you that Lethic (Windows spambot) stopped dead in its tracks, and it looks like both Cutwail and Darkmailer2 (a combination of 2 or 3 Linux server infestation types) were affected severely too. This server flow is quite low, and isn't seeing flow from several other bots (eg: Kelihos and Festi) at the moment, so I don't know what other ones die. But it's a start. I'll have to try this on a few other bots, bigger traps and different delays. Oh, as a FYI, relatively few connections failed to wait for the banner.
- [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- [Asrg] The Real Problem (was: An Anti-Spam Heuris… Andrew Sullivan
- Re: [Asrg] An Anti-Spam Heuristic Rich Kulawiec
- Re: [Asrg] An Anti-Spam Heuristic Bill Cole
- Re: [Asrg] An Anti-Spam Heuristic Bart Schaefer
- Re: [Asrg] The Real Problem Chris Lewis
- Re: [Asrg] The Real Problem Alessandro Vesely
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Michael Thomas
- Re: [Asrg] The Real Problem (was: An Anti-Spam He… Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic John Leslie
- Re: [Asrg] An Anti-Spam Heuristic Seth
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Michael Thomas
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- [Asrg] Countering Botnets to Reduce Spam Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Martijn Grooten
- Re: [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Rich Kulawiec
- Re: [Asrg] Countering Botnets to Reduce Spam Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Rich Kulawiec
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] Countering Botnets to Reduce Spam John Levine
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Barry Shein
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Alessandro Vesely
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis