Virus:TR/iBill.AJ
Date discovered:23/04/2007
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:High
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:117.976 Bytes
MD5 checksum:91345ab1a13dbb5a27660324779402a8
VDF version:6.38.01.19
IVDF version:6.38.01.21 - Monday, April 23, 2007

 General Alias:
   •  Kaspersky: Trojan-Downloader.Win32.Nurech.bh


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


Side effects:
   • Drops a malicious file

 Files The following file is created:

– %SYSDIR%\ipv6monl.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.Bzub.IS

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

– HKCR\CLSID\{36DBC179-A19F-48F2-B16A-6A3E19B42A87}\InprocServer32\
   • "default" = "c:\windows\\System32\\ipv6monl.dll"
   • "ThreadingModel"="apartment"



It creates the following entry in order to bypass the Windows XP firewall:

– HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List\
   • "C:\Program Files\\Internet Explorer\\IEXPLORE.EXE" = "C:\Program
      Files\\Internet Explorer\\IEXPLORE.EXE:*:Enabled:Internet Explorer"



The following registry keys are added:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\load
   • "net_insll"=dword:460a10be
   • "worg"=hex:7b,d5,d9,c2,78,6d,50,41,7a,7e,4b,1e,f5,c0,a8,cc,64,44,6a,00,fe,df,\
   • 8b,3e,33,05,90,93,78,3a,fe,f9,73,2b,a0,e7,60,31,d4
   • "cmpid"=hex:ce,1c,d9,5f,20,58,66,08,03,69,25,4f,a9,9a,86,d1,34,18,01,2b,d2,fb,\
   • a5,22,76,43,96,e1,20,0f,c2,85,42,74,b1,8d,25,1b,e2,c0,06,d0,a0,0f,d1,dd,73,\
   • 94,34,59,f6,1b,a8,cf,5d,e9,72,80,62,aa,24,b8,47,c4,35,b8,46,cb

Description inserted by Dennis Elser on Monday, April 23, 2007
Description updated by Alexander Vukcevic on Monday, April 23, 2007

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