TR/Zlob.IT.3.A - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Zlob.IT.3.A
Date discovered:	05/04/2006
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	16.572 Bytes
MD5 checksum:	b250c295ec5bfe1575a29b350A13f688
VDF version:	6.34.00.145 - Wed, 05 Apr 2006 15:38 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: Puper
   • TrendMicro: TROJ_ZLOB.KI

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Drops malicious files
   • Registry modification

Right after execution the following information is displayed:

Files The following files are created:

– %SYSDIR%\hp%hex number%.tmp Further investigation pointed out that this file is malware, too. Detected as: TR/Zlob.IT.3

– %SYSDIR%\interf.tlb Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Zlob.KE

Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer\
   run]
   • nvctrl.exe = nvctrl.exe

It registers a browser helper object (BHO) by adding the following keys:

– [HKCR\CLSID\{4DA4616D-7E6E-4FD9-A2D5-B6C535733E22}]
   • @ = Nothing

– [HKCR\CLSID\{4DA4616D-7E6E-4FD9-A2D5-B6C535733E22}\InprocServer32]
   • @ = %SYSDIR%\hp%hex number%.tmp
   • ThreadingModel = Apartment

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{4da4616d-7e6e-4fd9-a2d5-b6c535733e22}]
   • @ =

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objecta\{4da4616d-7e6e-4fd9-a2d5-b6c535733e22}]
   • @ =

The registered DLL file changes the startpage of Internet Explorer to: http://www.bestsecurityguide.com

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Andrei Gherman on Tue, 11 Apr 2006 16:43 (GMT+1)
Description updated by Andrei Gherman on Thu, 13 Apr 2006 17:15 (GMT+1)

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