R-fx Networks

LMD 1.3.9r1: Hexdepth Bug

by on Apr.03, 2011, under Development, My Blog

I have put up a revision to the 1.3.9 release of LMD that fixes a hexdepth bug in which malware greater than 65Kbytes would cause an error in the internal hexstring.pl script and be considered clean on the stage2 hex scanning of malware. This would mean that unless malware had a MD5 signature for it to be caught on stage1 scan, it would not be picked up by a corresponding HEX rule in stage2 scan if its file size was greater than 65Kbyte, due to the bug.

In addition, I have made the decision in this revision to enable release update checks in the default cron.daily entry installed by LMD, this can be found at /etc/cron.daily/maldet line 9 (after update) if you wish to comment it out. I would however encourage users to leave this option enabled as it will greatly improve receiving timely updates for future bugs fixes and release updates. In the past, the decision was made to not enable automatic release updates for many reasons but mostly in the interest of the software still maturing and being in early development, thereby not wanting to rock any boats with large and sweeping release updates to a version they may have got working the way they prefer. Now though, LMD has come a long way, the installer imports most options and ignore files and there are no drastically sweeping changes planned that will cause a great deal of headaches — so it seemed fitting time to enable automatic updates.

You can update your installation using the ‘maldet -d|–update-ver’ flags or download the current build for new installations.

This release update also coincides with passing 7k signatures….. We now sit at 7,106 signatures or +146 signatures added today. This is no small feat, I remember when we had just a couple hundred signatures not so long ago and I thought that was a big deal! The LMD submissions repository stays very active, it is now the source of almost 60% of the weekly signature additions and has contributed greatly to creating a vastly more accurate signature set that is representative of the threats you, the users, face day-to-day.

That said, month ending March stats recorded +1,464 installations of LMD bringing the install count to 7,157 — which puts LMD now ahead of APF in month-to-month new installation growth. Although, APF still beat LMD on raw downloads last month (3,091 vs 2,583), it is reasonable to predict that LMD will soon take the number one spot for downloads as well. It however still has a long way to go for total active installations, which APF sits at a comfortable 24,791 currently.

Till next time, happy malware hunting :)

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