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Recently we discovered an advanced backdoor sample – VirTool:WinNT/Exforel.A. Unlike traditional backdoor samples, this backdoor is implemented at the NDIS (Network Driver Interface Specification) level. VirTool:WinNT/Exforel.A implements a simple private TCP/IP stack and hooks NDIS_OPEN_BLOCK for the TCP/IP protocol, as shown in Figure 1.    Figure 1: Hooked functions in NDIS_OPEN_BLOCK This means that backdoor-related TCP traffic will be diverted to the private […]

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Necurs is a prevalent threat in the wild at the moment – variants of Necurs were reported on 83,427 unique machines during the month of November 2012. Necurs is mostly distributed by drive-by download. This means that you might be silently infected by Necurs when you visit websites that have been compromised by exploit kits such as Blackhole. So […]

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Necurs is a prevalent threat in the wild at the moment – variants of Necurs were reported on 83,427 unique machines during the month of November 2012. Necurs is mostly distributed by drive-by download. This means that you might be silently infected by Necurs when you visit websites that have been compromised by exploit kits such as Blackhole. So […]

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