From owner-freebsd-questions@FreeBSD.ORG Wed Aug 27 08:12:57 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7D0E216A4BF for ; Wed, 27 Aug 2003 08:12:57 -0700 (PDT) Received: from web1.nexusinternetsolutions.net (web1.nexusinternetsolutions.net [206.47.131.12]) by mx1.FreeBSD.org (Postfix) with SMTP id 06EF743FE3 for ; Wed, 27 Aug 2003 08:12:56 -0700 (PDT) (envelope-from dave@hawk-systems.com) Received: (qmail 77112 invoked from network); 27 Aug 2003 15:12:55 -0000 Received: from unknown (HELO ws1) (65.49.236.97) by web1.nexusinternetsolutions.net with SMTP; 27 Aug 2003 15:12:55 -0000 From: "Dave [Hawk-Systems]" To: "Sean Page" , Date: Wed, 27 Aug 2003 11:12:52 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Subject: RE: Chkrootkit anomaly X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Aug 2003 15:12:57 -0000 >Since there have already been a couple of questions on this I thought I'd >see if anyone could shed some light on something I've noticed since I >started running chkrootkit. It runs every 15 minutes (overkill? Nah.) in >quiet mode to cut down on noise in the logs, and sporadically I get these >notifications: > >You have 1 process hidden for readdir command >You have 1 process hidden for ps command >Warning: Possible LKM Trojan installed > >These messages will appear only on the odd occasion, seemingly completely at >random. >False positives or very crafty rootkit? >Any advice would be greatly appreciated! http://www.chkrootkit.org/ FAQ item #6 is what you are intersted in, although it isn't clear. The problem is that processes are ending before it can check it, thus they are incorrectly tagged as hidden and result in a false positive. There are better resources regarding this (researched it a few months ago) but that is roughly the gist of it. Dave