Virus:TR/Dldr.Nurech.BG
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:High
Distribution Potential:Medium
Damage Potential:Low
Static file:Yes
File size:23.552 Bytes
MD5 checksum:041c6826efdea3f72b167ea7a535978c
VDF version:6.38.00.223
IVDF version:6.38.00.227 - Tuesday, April 17, 2007

 General Method of propagation:
   • No own spreading routine


Alias:
   •  Mcafee: Downloader-AAP trojan
   •  Kaspersky: Trojan-Downloader.Win32.Nurech.bg
   •  TrendMicro: TROJ_DLOADER.HBH
   •  F-Secure: Trojan-Downloader.Win32.Nurech.bg
   •  Sophos: Troj/Clagger-BB
   •  Eset: Win32/TrojanDownloader.Nurech.BG trojan
   •  Bitdefender: Trojan.Downloader.Nurech.AI


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


Side effects:
   • Downloads files
   • Downloads a malicious file
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\iisca.exe



The following files are created:

– Non malicious files:
   • %SYSDIR%\DRIVERS\qias.tx
   • %temporary internet files%\im[1].txt




It tries to download a file:

– The location is the following:
   • http://knowledgecentral.co.uk**********/3.exe
It is saved on the local hard drive under: %SYSDIR%\3.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.BZub.IR

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "gtydf"="iisca.exe"

Description inserted by Viktor Graeber on Tuesday, April 17, 2007
Description updated by Viktor Graeber on Wednesday, April 18, 2007

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