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Storm Worm Changes Course
- http://preview.tinyurl.com/2mvsqs
November 1, 2007 - (Symantec Security Response Weblog) - "The authors of the Storm worm (also know as Trojan.Peacomm) have shown an uncanny knack of changing or shedding key components of the threat in order to enhance its persistence and spread. This week saw the latest incarnation of the threat, Trojan.Peacomm.D, reveal itself as halloween.exe or sony.exe. What is most interesting about this latest variant of the Storm worm is that its authors have removed some key functionality that was present in the previous variant, Trojan.Peacomm.C. Specifically, the threat no longer;
1. infects other legitimate drivers on the system. Previous variants infected drivers such as Tcpip.sys and Kbdclass.sys. This was a stealth-like feature used by the threat to start early with the operating system and without loading points in the Windows Registry.
2. injects itself into legitimate processes like Explorer.exe and Services.exe.
Instead the threat now relies less on legitimate components on the operating system and has new proprietary components to do its dirty work. The driver associated with the latest variant, noskrnl.sys, works hand in hand with the user mode noskrnl.exe to provide the same stealth-like capabilities that involved more components, both illegitimate and legitimate, in the past... In terms of the latest variant, both holloween.exe and sony.exe are detected as Trojan.Packed.13 and the low level driver component, noskrnl.sys, is detected as Trojan.Peacomm.D*..."
* http://www.symantec....-041222-3056-99
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