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Rachit Mathur

Rachit Mathur

Posts by Rachit Mathur

Memory Forging Attempt by a Rootkit

Thursday, April 21, 2011 at 9:27am

Some time ago a new rootkit appeared that at first glance seemed more similar to initial variants of TDL3 than to the updated TDL4 variants we have seen this year. Like TDL3, it also parasitically infected a driver by inserting code in the resource directory of the PE file. In this case the name of Read more…

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McAfee Labs Goes After Evil Maid

Monday, October 26, 2009 at 4:11am

In her recent blog Joanna Rutkowska describes a proof-of-concept code to attack Truecrypt system disk encryption. The blog also mentions “the concept behind the Evil Maid Attack is neither new, nor l33t in any way.” However, because the POC is now published, we expect script kiddies to jump on this opportunity and tweak this code Read more…

Generic Rootkit.d Strikes Again in New Variant

Monday, June 29, 2009 at 5:32am

A few days ago I got a chance to look at a recent variant of the DNSChanger.ad. It drops a common rootkit that is mostly associated with FakeAlert and DNSChanger Trojans. Over a period of time the dropped sys file names have changed from tdss*.sys to seneka*.sys to skynet*.sys and so on. Our memory detection Read more…

StealthMBR gets a makeover

Sunday, April 19, 2009 at 6:22pm

New variants of the StealthMBR trojan aka Mebroot rootkit have recently been spotted in-the-wild. These new variants are significantly different from earlier ones. StealthMBR has arguably been dubbed as the stealthiest rootkit ever seen. The new variants are using even ‘deeper’ techniques to evade detection. Broadly speaking, they are hijacking kernel objects (device object) to Read more…

Exploring StealthMBR Defenses

Sunday, March 23, 2008 at 4:53pm

As promised in my last post, we will discuss some interesting techniques used by StealthMBR and possible motives behind them. This new variant has implemented extensive protection technology at the kernel level, and looking at its layers of defenses it appears to be the job of organized and technical kernel code developer(s) who is/are probably making Read more…

Nuwar: new file names

Sunday, October 21, 2007 at 7:10am

We all know that Nuwar aka Storm gang has been continuously changing their spam email text, download sites, executables, network traffic patterns etc in their efforts to penetrate through the security defenses at various layers, all throughout this year. I had a chance to briefly look at a ‘fresh’ Nuwar sample this weekend. It is Read more…

New wave of nuwars storming in

Tuesday, August 7, 2007 at 4:24am

W32/Nuwar aka Storm worm authors have been active again recently. It is speculated to be one of the largest botnets and has the potential to launch a mammoth DDoS attack. The huge rise in the numbers of botnets lately has been attributed to the social engineering tactics that recent eCard spam mails employ. This threat Read more…

A new root’Kid’ on the block

Friday, May 4, 2007 at 8:23am

In the past two weeks McAfee Avert Labs is observing activity by a new parasitic worm named W32/Almanahe.a. Apart from its parasitic nature, this worm is particularly interesting because of the rootkit technique implemented by it to hide and protect itself. Some background: Rootkit techniques vary from simple “user mode” to complex “kernel mode”. Most of Read more…

Malware Exploits Microsoft “Feature” Along With Vulnerabilities

Sunday, April 8, 2007 at 1:48pm

Danger And Benefits of Obfuscation Most of the malicious code we see on a daily hourly basis is obfuscated in one way or another. PE (portable executable format) files are packed (compressed and/or encrypted), scripts are encoded and/or encrypted, etc. Obfuscation is one of the biggest challenges for content scanners today, both on the host Read more…

Autopilot IRCBots – smart and funny

Friday, September 29, 2006 at 10:52am

A vast majority of IRC based bots seen these days can be said to be on “Autopilot” in a sense. After joining a pre-defined IRC channel the bots read channel topics and accept them as commands. Authors of such bots just need to set these channels up with correct commands and then leave it up Read more…